In GAMSAT Section III Buoyancy & Hydrostatics, state Archimedes' Principle and predict the fraction of a floating object submerged.

Hydrostatic Gauge Pressure at depth h: P_gauge = ρ_fluid · g · h (Absolute pressure P_abs = P_atm + ρgh). Archimedes' Principle: The upward Buoyant Force (F_B) on a submerged or floating object equals the weight of the fluid displaced: F_B = ρ_fluid · V_submerged · g. For a floating object (F_B = m_object · g): Fraction submerged = V_submerged / V_object = ρ_object / ρ_fluid.

In GAMSAT Section III Alkene Addition Reactions, compare Markovnikov vs. Anti-Markovnikov addition and Syn vs. Anti stereoselectivity.

Markovnikov's Rule (HBr, HCl, H3O+ hydration): H+ adds to the carbon with MORE hydrogens so the halide/OH attacks the more stable carbocation (subject to hydride/methyl shifts; Oxymercuration-Demercuration [Hg(OAc)2, H2O / NaBH4] gives Markovnikov alcohol WITHOUT carbocation rearrangement). Anti-Markovnikov: Hydroboration-Oxidation [1. BH3·THF, 2. H2O2, NaOH] gives Syn-addition of H and OH to the LESS substituted carbon; HBr + Peroxides (ROOR) gives radical anti-Markovnikov bromination. Br2/Cl2 gives ANTI-addition via a cyclic bromonium ion; H2/Pd-C and cold dilute KMnO4/OsO4 give SYN-addition.

In GAMSAT Section III Fluid Mechanics (Haemodynamics), state the Continuity Equation, Bernoulli's Equation, and Poiseuille's Law of Laminar Flow.

Continuity Equation (incompressible fluid): Q = A1·v1 = A2·v2 (narrowing a single pipe increases flow velocity, though in the human body total cross-sectional area of all capillaries combined is huge, so capillary blood velocity is slowest). Bernoulli's Equation (inviscid flow): P + (1/2)ρv^2 + ρgh = constant. Poiseuille's Law (viscous laminar flow through cylindrical blood vessels): Flow rate Q = ΔP / R = (π · ΔP · r^4) / (8 · η · L). Because resistance R ∝ 1 / r^4, halving a vessel's radius increases resistance by 2^4 = 16-fold and reduces blood flow to 1/16th!

In GAMSAT Section III Renal Physiology, how do you calculate Renal Clearance (Cx), Glomerular Filtration Rate (GFR via Inulin), Effective Renal Plasma Flow (ERPF via PAH), and Filtration Fraction?

Renal Clearance of substance X: Cx = (Ux · V) / Px (where Ux = urine concentration, V = urine flow rate in mL/min, Px = plasma concentration). Because Inulin (and approximately Creatinine) is freely filtered and neither reabsorbed nor secreted, C_inulin = GFR (~120–125 mL/min). If Cx GFR, net tubular secretion occurred. Para-aminohippuric acid (PAH) is completely cleared in one pass (filtered + secreted), so C_PAH = ERPF (~600–650 mL/min). Filtration Fraction FF = GFR / RPF ≈ 20%.

In GAMSAT Section III Starling Forces across a capillary bed, write the Starling Equation for Net Filtration Pressure (NFP) and explain the mechanisms of Oedema.

NFP = [(Pc - Pi) - σ(πc - πi)], where Pc = capillary hydrostatic pressure (pushes fluid OUT), πc = plasma colloid oncotic pressure from albumin (pulls fluid IN), Pi = interstitial hydrostatic pressure, and πi = interstitial oncotic pressure. At the arterial end of a capillary, Pc > πc → net Filtration; at the venous end, Pc < πc → net Reabsorption (excess filtered fluid is returned via lymphatics). Oedema occurs from: 1) Increased Pc (heart failure, DVT, venous obstruction), 2) Decreased πc (hypoalbuminaemia in nephrotic syndrome, cirrhosis, kwashiorkor), 3) Increased capillary permeability (sepsis, burns, histamine), or 4) Lymphatic obstruction (lymphedema, filariasis).

In GAMSAT Section III, how do you assign Cahn-Ingold-Prelog (CIP) R/S absolute configuration to a chiral centre and E/Z configuration to an alkene?

Rank the 4 substituents on the chiral centre by atomic number of the directly attached atom (1 = highest atomic number, 4 = lowest, typically H). With lowest priority group #4 pointing AWAY (on a dashed bond): 1 → 2 → 3 clockwise = R (Rectus); counter-clockwise = S (Sinister). If group #4 is pointing TOWARD you (on a wedged bond), reverse the result. For alkenes, compare the higher-priority group on C1 with the higher-priority group on C2: both on the SAME side = Z (Zusammen); on OPPOSITE sides = E (Entgegen).

In GAMSAT Section III Biochemistry, how do you calculate the Isoelectric Point (pI) of an Amino Acid, and what is the net charge of an amino acid when pH pI?

At pH = pI, the amino acid exists predominantly as a neutral Zwitterion (net charge = 0). For a neutral side-chain amino acid: pI = (pKa_COOH + pKa_NH3+) / 2. For an Acidic amino acid (Aspartic acid, Glutamic acid): average the TWO LOWEST pKa values: pI = (pKa1 + pKaR) / 2 (~3). For a Basic amino acid (Lysine, Arginine, Histidine): average the TWO HIGHEST pKa values: pI = (pKaR + pKa2) / 2 (~9–11). When solution pH pI (more basic), it is deprotonated and carries a NET NEGATIVE charge.

In GAMSAT Section II (Written Communication), how does Task A differ from Task B in theme, genre, and structural expectations?

Task A addresses socio-political, economic, ideological, legal, or scientific themes (typically suited to an analytical, argumentative, or dialectical essay: Thesis → Antithesis → Synthesis). Task B addresses personal, interpersonal, philosophical, or emotional human experiences (suited to a reflective, philosophical, or discursive essay exploring nuance, vulnerability, and the human condition). Both are completed in 60 minutes total (30 minutes per essay).

In GAMSAT Section III Thermodynamics, how do Enthalpy (ΔH), Entropy (ΔS), and Temperature (T in Kelvin) determine Gibbs Free Energy (ΔG) and reaction spontaneity?

ΔG = ΔH - TΔS (and at equilibrium, ΔG = 0 so ΔG° = -RT·ln(Keq)). 1) ΔH 0 (entropy increases): ΔG 0 (endothermic) and ΔS 0, non-spontaneous at ALL temperatures. 3) ΔH |TΔS|). 4) ΔH > 0 and ΔS > 0: spontaneous only at HIGH temperatures (where TΔS > ΔH).

In GAMSAT Section III Biomechanics, how do you solve Torque (Rotational Equilibrium) and Mechanical Advantage problems for human joints (e.g., biceps-forearm lever)?

Torque τ = r · F · sinθ (where r⊥ = r·sinθ is the perpendicular moment arm from the pivot/joint). For static equilibrium: ΣF = 0 AND Στ_clockwise = Στ_anticlockwise about any pivot. The human forearm (pivot at elbow, biceps attached ~4 cm from elbow, load held in hand ~35 cm from elbow) is a Class 3 Lever (effort applied between fulcrum and load): Mechanical Advantage MA = F_load / F_effort = r_effort / r_load < 1, requiring the biceps muscle to generate ~8–10× the weight held in the hand in exchange for greater range and speed of hand motion.

In GAMSAT Section III Physiology, how do right-shift ('CADET, face Right!') vs. left-shift factors affect the Oxygen-Haemoglobin Dissociation Curve and P50?

The sigmoidal curve reflects positive cooperativity among haemoglobin's 4 subunits (as opposed to myoglobin's hyperbolic curve with 1 subunit and much higher O2 affinity). Right Shift (increased P50 = LOWER O2 affinity = facilitates O2 unloading to metabolically active tissues—Bohr Effect): raised CO2, Acidosis (low pH / raised H+), raised 2,3-BPG (e.g., high altitude), Exercise, and raised Temperature. Left Shift (decreased P50 = HIGHER O2 affinity): Fetal Haemoglobin (HbF binds 2,3-BPG weakly so it extracts O2 from maternal HbA), Carbon Monoxide (CO), Alkalosis, and hypothermia.

What is the Hegel-inspired 'Thesis → Antithesis → Synthesis' dialectical structure used for high-scoring (75+) GAMSAT Section II essays?

1) Thesis: Define the core tension in the quote comments and present a strong primary proposition supported by concrete historical, sociological, or philosophical evidence. 2) Antithesis: Interrogate the limitations, counter-cases, or unintended consequences of the thesis when taken to an extreme. 3) Synthesis: Reconcile the tension by formulating a higher-order, conditional principle that explains when and how the quote's truth holds in modern society.

In GAMSAT Section III Chemical Kinetics, how do you determine Reaction Order from experimental initial rates or units of the rate constant k, and what is the Arrhenius Equation?

For Rate = k[A]^m[B]^n: Zero order (m=0): Rate = k (units M·s^-1), [A] vs. t is linear with slope -k, half-life t1/2 = [A]0 / (2k). First order (m=1): Rate = k[A] (units s^-1), ln[A] vs. t is linear with slope -k, half-life t1/2 = ln(2)/k = 0.693/k is CONSTANT (independent of [A]0). Second order (m=2): Rate = k[A]^2 (units M^-1·s^-1), 1/[A] vs. t is linear with slope +k, half-life t1/2 = 1 / (k[A]0). Arrhenius equation: k = A · e^(-Ea / RT), so ln(k) = ln(A) - (Ea/R)(1/T).

In GAMSAT Section III Carbonyl Chemistry, explain Nucleophilic Addition to Aldehydes/Ketones, Keto-Enol Tautomerism, and the Aldol Condensation.

Aldehydes are more reactive toward nucleophilic addition than Ketones due to less steric hindrance and only one electron-donating alkyl group. A ketone or aldehyde with an α-hydrogen is in rapid equilibrium with its Enol isomer (tautomers are constitutional isomers differing in proton and double-bond placement, NOT resonance structures). In base or acid, an α-carbon deprotonates to form a resonance-stabilized Enolate nucleophile that attacks another carbonyl carbon to form a β-hydroxy aldehyde/ketone (Aldol addition), which dehydrates upon heating to an α,β-unsaturated carbonyl (Aldol condensation).

In GAMSAT Section III Endocrine Physiology, trace the Hypothalamic-Pituitary-Target Organ axes and distinguish Primary, Secondary, and Tertiary Endocrine Disorders.

Hypothalamus secretes releasing/inhibiting hormones (TRH, CRH, GnRH, GHRH, Dopamine inhibits Prolactin) via hypophyseal portal vessels → Anterior Pituitary secretes tropic hormones (TSH, ACTH, LH/FSH, GH, Prolactin) → Target gland secretes effector hormone (Thyroxine T4/T3, Cortisol, Testosterone/Oestradiol, IGF-1) which exerts Negative Feedback on both pituitary and hypothalamus. Primary disorder = defect in Target Gland (e.g., Primary hypothyroidism: low T4, HIGH TSH). Secondary disorder = defect in Pituitary (low T4, LOW/inappropriately normal TSH). Tertiary disorder = defect in Hypothalamus.

In GAMSAT Section III Organic Chemistry, compare the SN1 and SN2 Nucleophilic Substitution mechanisms across kinetics, stereochemistry, substrate preference, nucleophile, and solvent.

SN1 (Unimolecular, 2-step via planar Carbocation intermediate): Rate = k[Substrate]; favours 3° > 2° >> 1° (carbocation stability via hyperconjugation/inductive effect and resonance); produces a Racemic Mixture (50% retention + 50% inversion of configuration); favoured by weak nucleophiles and Polar Protic solvents (H2O, ROH) that stabilize the carbocation and leaving group. SN2 (Bimolecular, 1-step concerted backside attack): Rate = k[Substrate][Nucleophile]; favours Methyl > 1° > 2° (steric hindrance blocks 3°); causes 100% Walden Inversion of stereochemistry (R ↔ S); favoured by strong nucleophiles and Polar Aprotic solvents (DMSO, Acetone, DMF, Acetonitrile).

In GAMSAT Section III Neurophysiology, use the Nernst and Goldman-Hodgkin-Katz concepts to explain Resting Membrane Potential (-70 mV) and the phases of a Neuronal Action Potential.

Resting potential (-70 mV) is close to the K+ equilibrium potential (E_K ≈ -90 mV) because resting membrane permeability is much higher for K+ (leak channels) than Na+ (E_Na ≈ +60 mV), maintained by the 3 Na+ out / 2 K+ in ATPase pump. Action Potential: 1) Depolarization to threshold (-55 mV) opens fast voltage-gated Na+ channels → rapid Na+ influx drives Vm toward +30/+40 mV; 2) At peak, Na+ inactivation gates close (causing the Absolute Refractory Period where no second AP can fire) and delayed voltage-gated K+ channels open; 3) K+ efflux repolarizes and briefly hyperpolarizes (Relative Refractory Period) the membrane toward E_K.

In GAMSAT Section III Sound & Waves, state the Decibel (dB) logarithmic sound intensity formula and the Doppler Effect equation.

Sound Intensity Level β (in dB) = 10 · log10(I / I0), where I0 = 10^-12 W/m^2. Every +10 dB increase represents a 10-fold (10^1) increase in intensity I; every +20 dB is a 100-fold (10^2) increase; every +3 dB represents a doubling (×2) of intensity. Since I = P / (4πr^2), doubling distance r reduces intensity to 1/4 (-6 dB). Doppler Effect: f_observed = f_source · [(v_wave ± v_observer) / (v_wave ∓ v_source)] (use top signs when moving TOWARD each other → higher frequency; bottom signs when moving AWAY → lower frequency).

In GAMSAT Section III Graph & Nomogram Interpretation, how do you read a Semi-Logarithmic, Log-Log, or Ternary (Triangular Phase) Diagram quickly under exam pressure?

Semi-log plot (log Y vs. linear X): an exponential relationship y = A·e^(kx) plots as a straight line; each tick mark step on the log axis multiplies the value by a constant factor (e.g., ×10). Log-Log plot (log Y vs. log X): a power law y = a·x^n plots as a straight line whose slope equals the exponent n. Ternary diagram (3 components A, B, C summing to 100%): each apex represents 100% of that pure component, and the base opposite that apex represents 0%; read parallel gridlines running parallel to the opposite base.

In GAMSAT Section III DC Circuits (and Neuronal Membrane RC Models), state rules for Resistors and Capacitors in Series vs. Parallel and the RC Time Constant τ.

Resistors in Series: R_eq = R1 + R2; in Parallel: 1/R_eq = 1/R1 + 1/R2 = (R1·R2)/(R1+R2). Capacitors (C = Q/V = εA/d) follow the OPPOSITE rule: in Parallel: C_eq = C1 + C2; in Series: 1/C_eq = 1/C1 + 1/C2. In an RC circuit (like a neuron's lipid bilayer capacitance C_m in parallel with ion channel resistance R_m), the Time Constant τ = R · C is the time required to charge the capacitor to 63.2% (1 - e^-1) of V_max or discharge to 36.8% (e^-1).

In GAMSAT Section III Organic Chemistry, compare E1 and E2 Elimination reactions and state Zaitsev's Rule vs. Hofmann's Rule.

E1 (Unimolecular, 2-step via carbocation intermediate, competes with SN1 using weak base + heat): Rate = k[Substrate], favours 3° > 2°. E2 (Bimolecular, 1-step concerted proton abstraction + leaving group departure): Rate = k[Substrate][Strong Base]; requires strictly ANTI-PERIPLANAR (180° dihedral angle) geometry between the β-hydrogen and the leaving group (e.g., trans-diaxial in cyclohexane chairs). Zaitsev's Rule: small unhindered bases (NaOEt, KOH) yield the MORE substituted (more stable) alkene. Hofmann's Rule: bulky sterically hindered bases (tert-butoxide, LDA) abstract the least hindered proton to yield the LESS substituted (terminal) alkene.

How do Electron-Withdrawing Groups (EWGs) vs. Electron-Donating Groups (EDGs) affect the Acidity (Ka and pKa) of Carboxylic Acids and Phenols?

Stronger acid = LARGER Ka = SMALLER pKa. Any substituent that stabilizes the negatively charged conjugate base (A-) increases acidity: Electron-Withdrawing Groups (-NO2, -CN, -CF3, halogens -F > -Cl > -Br > -I) pull electron density away via Inductive (-I) and/or Resonance (-M) effects, stabilizing the carboxylate/phenoxide anion and LOWERING pKa (this inductive effect diminishes rapidly with distance down the carbon chain). Electron-Donating Groups (alkyl groups -CH3, -OCH3) destabilize the anion and RAISE pKa.

In GAMSAT Section III Electrochemistry, how do you use the Nernst Equation to find cell potential under non-standard concentrations at 25°C (298 K)?

Standard cell potential: E°cell = E°red(cathode) - E°red(anode), and ΔG° = -n·F·E°cell. At 298 K, the Nernst Equation is: E_cell = E°cell - (0.0592 / n) · log10(Q), where n is moles of electrons transferred and Q is the reaction quotient [Products]/[Reactants]. In a Concentration Cell (identical electrodes, E°cell = 0 V), current flows spontaneously from the dilute half-cell (anode, oxidized to raise concentration) to the concentrated half-cell (cathode, reduced to lower concentration) until concentrations equalize (E_cell = 0 at equilibrium).

In GAMSAT Section III Acid-Base Physiology, interpret a Davenport Diagram (Plasma [HCO3-] vs. pH with PaCO2 isobars).

Normal centre point: pH = 7.4, [HCO3-] = 24 mmol/L, PaCO2 = 40 mmHg. Moving along the normal buffer line up-and-left (low pH, high HCO3-, high PaCO2 isobar) = Uncompensated Respiratory Acidosis; compensation by kidneys retaining HCO3- moves vertically UP toward pH 7.4. Moving down-and-left along the 40 mmHg PaCO2 isobar (low pH, low HCO3-) = Uncompensated Metabolic Acidosis; respiratory compensation (hyperventilation) moves down-and-right to a lower PaCO2 isobar toward pH 7.4.

In GAMSAT Section III Enzyme Kinetics, interpret a Michaelis-Menten curve and a Lineweaver-Burk double-reciprocal plot (1/V0 vs. 1/[S]).

Michaelis-Menten equation: V0 = (Vmax · [S]) / (Km + [S]), where Km is the substrate concentration at which V0 = 1/2 Vmax (lower Km = higher enzyme affinity for substrate). Lineweaver-Burk equation: 1/V0 = (Km / Vmax)(1/[S]) + 1/Vmax. Y-intercept = 1/Vmax; X-intercept = -1/Km; Slope = Km/Vmax. Competitive inhibition: lines intersect on the Y-axis (same Vmax, apparent Km increases so X-intercept moves closer to 0). Non-competitive inhibition: lines intersect on the X-axis (same Km, Vmax decreases so Y-intercept moves higher).

In GAMSAT Section I (Reasoning in Humanities and Social Sciences), how do you distinguish Irony, Satire, Sarcasm, and Paradox in literary or political cartoons?

Verbal/Situational Irony: contrast between literal expression/expectation and actual meaning/outcome. Satire: use of humour, exaggeration, ridicule, or irony to expose and critique societal or political vices/folly with the aim of reform. Sarcasm: sharp, bitter verbal irony directed personally to mock or wound. Paradox: a seemingly self-contradictory statement that reveals a deeper underlying truth upon reflection.

In GAMSAT Section III Mental Math, how do you quickly estimate pH from [H+] = 3.2 × 10^-5 M without a calculator using logarithmic approximations?

Remember log10(2) ≈ 0.30, log10(3) ≈ 0.48, log10(5) ≈ 0.70. For [H+] = a × 10^-n M, pH = n - log10(a). Thus for [H+] = 3.2 × 10^-5 M, pH ≈ 5 - log10(3.2) ≈ 5 - 0.50 = 4.50.

In GAMSAT Section III Optics, apply the Thin Lens / Mirror Equation (1/f = 1/do + 1/di) and Magnification (M = -di/do = hi/ho) with sign conventions.

Focal length f: POSITIVE for converging (convex lens / concave mirror); NEGATIVE for diverging (concave lens / convex mirror). Image distance di: POSITIVE for Real images (formed on opposite side of lens, inverted, M 0). Lens Optical Power in Dioptres: P = 1 / f (with f in meters). Diverging lenses ALWAYS form virtual, upright, diminished (SUV) images regardless of object distance.

In GAMSAT Section III Cardiac Physiology, interpret a Left Ventricular Pressure-Volume (PV) Loop and how Preload, Afterload, and Inotropy (Contractility) shift the loop.

4 phases counter-clockwise: 1) Diastolic filling (mitral valve opens → closes at End-Diastolic Volume EDV), 2) Isovolumetric Contraction (all valves closed, vertical rise in pressure), 3) Systolic Ejection (aortic valve opens → closes at End-Systolic Volume ESV), 4) Isovolumetric Relaxation (vertical drop in pressure). Stroke Volume SV = EDV - ESV (width of loop); Ejection Fraction EF = SV / EDV; Cardiac Work = area inside loop. Increased Preload stretches right edge (higher EDV → higher SV via Frank-Starling law). Increased Afterload (aortic pressure) raises loop height and increases ESV (reducing SV). Increased Inotropy shifts the End-Systolic Pressure-Volume Relationship (ESPVR line) left, decreasing ESV and increasing SV.

In GAMSAT Section III Stereochemistry, how do you calculate the maximum number of Stereoisomers for a molecule with n chiral centres, and distinguish Enantiomers, Diastereomers, and Meso Compounds?

Maximum stereoisomers = 2^n (where n = number of chiral sp3 carbons with 4 different groups). Enantiomers: non-superimposable mirror images (opposite R/S configuration at ALL chiral centres; identical physical/chemical properties in achiral environments except they rotate plane-polarized light in equal and opposite directions; 50:50 racemic mixture is optically inactive). Diastereomers: stereoisomers that are NOT mirror images (opposite configuration at some, but not all, chiral centres; have DIFFERENT physical properties like melting point/solubility). Meso Compound: has ≥2 chiral centres AND an internal plane of symmetry, making it achiral and optically inactive (reduces stereoisomer count below 2^n).

In GAMSAT Section I poetry and prose analysis, compare Metaphor, Metonymy, Synecdoche, Allusion, and Juxtaposition.

Metaphor: implicit comparison equating two unrelated things. Metonymy: substituting an attribute or closely associated concept for the thing itself (e.g., 'Canberra' for the Australian Federal Government, 'the Crown' for the monarchy). Synecdoche: a part represents the whole, or the whole represents a part (e.g., 'all hands on deck'). Allusion: indirect reference to a historical, mythological, biblical, or literary work. Juxtaposition: placing two contrasting ideas/images side-by-side to highlight their differences.

In GAMSAT Section III Gas Laws & Colligative Properties, state the Ideal Gas Law, Dalton's Law of Partial Pressures, Graham's Law of Effusion, and Osmotic Pressure.

Ideal Gas Law: PV = nRT (at STP 0°C/1 atm, 1 mol = 22.4 L; real gases deviate from ideal behaviour at HIGH pressure and LOW temperature due to finite molecular volume and intermolecular attractions). Dalton's Law: P_total = Σ P_i = Σ (X_i · P_total). Graham's Law: Rate1 / Rate2 = √(M2 / M1) (lighter gases effuse/diffuse faster). Osmotic Pressure: Π = i·M·R·T (where i = van 't Hoff dissociation factor, e.g., i=2 for NaCl, i=3 for CaCl2).

GAMSAT Section I, II & III: Humanities Text Analysis, Organic Chemistry Mechanisms, Acid-Base/pKa, Thermodynamics & Biomechanics

High-yield ACER GAMSAT Section I (Reasoning in Humanities), Section II (Written Communication Task A & Task B), and Section III (Reasoning in Biological and Physical Sciences: Organic Chemistry, Physical Chemistry, Physics, and Physiology).

Level: intermediate
Languages: en → en
Cards: 32
Markdown: GAMSAT Section I, II & III: Humanities Text Analysis, Organic Chemistry Mechanisms, Acid-Base/pKa, Thermodynamics & Biomechanics (.md)

Flashcards (32)

#	Front (Term / Question)	Back (Definition / Answer)
1	In GAMSAT Section III Buoyancy & Hydrostatics, state Archimedes' Principle and predict the fraction of a floating object submerged.	Hydrostatic Gauge Pressure at depth h: P_gauge = ρ_fluid · g · h (Absolute pressure P_abs = P_atm + ρgh). Archimedes' Principle: The upward Buoyant Force (F_B) on a submerged or floating object equals the weight of the fluid displaced: F_B = ρ_fluid · V_submerged · g. For a floating object (F_B = m_object · g): Fraction submerged = V_submerged / V_object = ρ_object / ρ_fluid.
2	In GAMSAT Section III Alkene Addition Reactions, compare Markovnikov vs. Anti-Markovnikov addition and Syn vs. Anti stereoselectivity.	Markovnikov's Rule (HBr, HCl, H3O+ hydration): H+ adds to the carbon with MORE hydrogens so the halide/OH attacks the more stable carbocation (subject to hydride/methyl shifts; Oxymercuration-Demercuration [Hg(OAc)2, H2O / NaBH4] gives Markovnikov alcohol WITHOUT carbocation rearrangement). Anti-Markovnikov: Hydroboration-Oxidation [1. BH3·THF, 2. H2O2, NaOH] gives Syn-addition of H and OH to the LESS substituted carbon; HBr + Peroxides (ROOR) gives radical anti-Markovnikov bromination. Br2/Cl2 gives ANTI-addition via a cyclic bromonium ion; H2/Pd-C and cold dilute KMnO4/OsO4 give SYN-addition.
3	In GAMSAT Section III Fluid Mechanics (Haemodynamics), state the Continuity Equation, Bernoulli's Equation, and Poiseuille's Law of Laminar Flow.	Continuity Equation (incompressible fluid): Q = A1·v1 = A2·v2 (narrowing a single pipe increases flow velocity, though in the human body total cross-sectional area of all capillaries combined is huge, so capillary blood velocity is slowest). Bernoulli's Equation (inviscid flow): P + (1/2)ρv^2 + ρgh = constant. Poiseuille's Law (viscous laminar flow through cylindrical blood vessels): Flow rate Q = ΔP / R = (π · ΔP · r^4) / (8 · η · L). Because resistance R ∝ 1 / r^4, halving a vessel's radius increases resistance by 2^4 = 16-fold and reduces blood flow to 1/16th!
4	In GAMSAT Section III Renal Physiology, how do you calculate Renal Clearance (Cx), Glomerular Filtration Rate (GFR via Inulin), Effective Renal Plasma Flow (ERPF via PAH), and Filtration Fraction?	Renal Clearance of substance X: Cx = (Ux · V) / Px (where Ux = urine concentration, V = urine flow rate in mL/min, Px = plasma concentration). Because Inulin (and approximately Creatinine) is freely filtered and neither reabsorbed nor secreted, C_inulin = GFR (~120–125 mL/min). If Cx < GFR, net tubular reabsorption occurred (e.g., glucose has C_glucose = 0 below renal threshold ~10–11 mmol/L); if Cx > GFR, net tubular secretion occurred. Para-aminohippuric acid (PAH) is completely cleared in one pass (filtered + secreted), so C_PAH = ERPF (~600–650 mL/min). Filtration Fraction FF = GFR / RPF ≈ 20%.
5	In GAMSAT Section III Starling Forces across a capillary bed, write the Starling Equation for Net Filtration Pressure (NFP) and explain the mechanisms of Oedema.	NFP = [(Pc - Pi) - σ(πc - πi)], where Pc = capillary hydrostatic pressure (pushes fluid OUT), πc = plasma colloid oncotic pressure from albumin (pulls fluid IN), Pi = interstitial hydrostatic pressure, and πi = interstitial oncotic pressure. At the arterial end of a capillary, Pc > πc → net Filtration; at the venous end, Pc < πc → net Reabsorption (excess filtered fluid is returned via lymphatics). Oedema occurs from: 1) Increased Pc (heart failure, DVT, venous obstruction), 2) Decreased πc (hypoalbuminaemia in nephrotic syndrome, cirrhosis, kwashiorkor), 3) Increased capillary permeability (sepsis, burns, histamine), or 4) Lymphatic obstruction (lymphedema, filariasis).
6	In GAMSAT Section III, how do you assign Cahn-Ingold-Prelog (CIP) R/S absolute configuration to a chiral centre and E/Z configuration to an alkene?	Rank the 4 substituents on the chiral centre by atomic number of the directly attached atom (1 = highest atomic number, 4 = lowest, typically H). With lowest priority group #4 pointing AWAY (on a dashed bond): 1 → 2 → 3 clockwise = R (Rectus); counter-clockwise = S (Sinister). If group #4 is pointing TOWARD you (on a wedged bond), reverse the result. For alkenes, compare the higher-priority group on C1 with the higher-priority group on C2: both on the SAME side = Z (Zusammen); on OPPOSITE sides = E (Entgegen).
7	In GAMSAT Section III Biochemistry, how do you calculate the Isoelectric Point (pI) of an Amino Acid, and what is the net charge of an amino acid when pH < pI vs. pH > pI?	At pH = pI, the amino acid exists predominantly as a neutral Zwitterion (net charge = 0). For a neutral side-chain amino acid: pI = (pKa_COOH + pKa_NH3+) / 2. For an Acidic amino acid (Aspartic acid, Glutamic acid): average the TWO LOWEST pKa values: pI = (pKa1 + pKaR) / 2 (~3). For a Basic amino acid (Lysine, Arginine, Histidine): average the TWO HIGHEST pKa values: pI = (pKaR + pKa2) / 2 (~9–11). When solution pH < pI (more acidic, excess H+), the protein is protonated and carries a NET POSITIVE charge; when pH > pI (more basic), it is deprotonated and carries a NET NEGATIVE charge.
8	In GAMSAT Section II (Written Communication), how does Task A differ from Task B in theme, genre, and structural expectations?	Task A addresses socio-political, economic, ideological, legal, or scientific themes (typically suited to an analytical, argumentative, or dialectical essay: Thesis → Antithesis → Synthesis). Task B addresses personal, interpersonal, philosophical, or emotional human experiences (suited to a reflective, philosophical, or discursive essay exploring nuance, vulnerability, and the human condition). Both are completed in 60 minutes total (30 minutes per essay).
9	In GAMSAT Section III Thermodynamics, how do Enthalpy (ΔH), Entropy (ΔS), and Temperature (T in Kelvin) determine Gibbs Free Energy (ΔG) and reaction spontaneity?	ΔG = ΔH - TΔS (and at equilibrium, ΔG = 0 so ΔG° = -RT·ln(Keq)). 1) ΔH < 0 (exothermic) and ΔS > 0 (entropy increases): ΔG < 0, spontaneous at ALL temperatures. 2) ΔH > 0 (endothermic) and ΔS < 0: ΔG > 0, non-spontaneous at ALL temperatures. 3) ΔH < 0 and ΔS < 0: spontaneous only at LOW temperatures (where \|ΔH\| > \|TΔS\|). 4) ΔH > 0 and ΔS > 0: spontaneous only at HIGH temperatures (where TΔS > ΔH).
10	In GAMSAT Section III Biomechanics, how do you solve Torque (Rotational Equilibrium) and Mechanical Advantage problems for human joints (e.g., biceps-forearm lever)?	Torque τ = r · F · sinθ (where r⊥ = r·sinθ is the perpendicular moment arm from the pivot/joint). For static equilibrium: ΣF = 0 AND Στ_clockwise = Στ_anticlockwise about any pivot. The human forearm (pivot at elbow, biceps attached ~4 cm from elbow, load held in hand ~35 cm from elbow) is a Class 3 Lever (effort applied between fulcrum and load): Mechanical Advantage MA = F_load / F_effort = r_effort / r_load < 1, requiring the biceps muscle to generate ~8–10× the weight held in the hand in exchange for greater range and speed of hand motion.
11	In GAMSAT Section III Physiology, how do right-shift ('CADET, face Right!') vs. left-shift factors affect the Oxygen-Haemoglobin Dissociation Curve and P50?	The sigmoidal curve reflects positive cooperativity among haemoglobin's 4 subunits (as opposed to myoglobin's hyperbolic curve with 1 subunit and much higher O2 affinity). Right Shift (increased P50 = LOWER O2 affinity = facilitates O2 unloading to metabolically active tissues—Bohr Effect): raised CO2, Acidosis (low pH / raised H+), raised 2,3-BPG (e.g., high altitude), Exercise, and raised Temperature. Left Shift (decreased P50 = HIGHER O2 affinity): Fetal Haemoglobin (HbF binds 2,3-BPG weakly so it extracts O2 from maternal HbA), Carbon Monoxide (CO), Alkalosis, and hypothermia.
12	What is the Hegel-inspired 'Thesis → Antithesis → Synthesis' dialectical structure used for high-scoring (75+) GAMSAT Section II essays?	1) Thesis: Define the core tension in the quote comments and present a strong primary proposition supported by concrete historical, sociological, or philosophical evidence. 2) Antithesis: Interrogate the limitations, counter-cases, or unintended consequences of the thesis when taken to an extreme. 3) Synthesis: Reconcile the tension by formulating a higher-order, conditional principle that explains when and how the quote's truth holds in modern society.
13	In GAMSAT Section III Chemical Kinetics, how do you determine Reaction Order from experimental initial rates or units of the rate constant k, and what is the Arrhenius Equation?	For Rate = k[A]^m[B]^n: Zero order (m=0): Rate = k (units M·s^-1), [A] vs. t is linear with slope -k, half-life t1/2 = [A]0 / (2k). First order (m=1): Rate = k[A] (units s^-1), ln[A] vs. t is linear with slope -k, half-life t1/2 = ln(2)/k = 0.693/k is CONSTANT (independent of [A]0). Second order (m=2): Rate = k[A]^2 (units M^-1·s^-1), 1/[A] vs. t is linear with slope +k, half-life t1/2 = 1 / (k[A]0). Arrhenius equation: k = A · e^(-Ea / RT), so ln(k) = ln(A) - (Ea/R)(1/T).
14	In GAMSAT Section III Carbonyl Chemistry, explain Nucleophilic Addition to Aldehydes/Ketones, Keto-Enol Tautomerism, and the Aldol Condensation.	Aldehydes are more reactive toward nucleophilic addition than Ketones due to less steric hindrance and only one electron-donating alkyl group. A ketone or aldehyde with an α-hydrogen is in rapid equilibrium with its Enol isomer (tautomers are constitutional isomers differing in proton and double-bond placement, NOT resonance structures). In base or acid, an α-carbon deprotonates to form a resonance-stabilized Enolate nucleophile that attacks another carbonyl carbon to form a β-hydroxy aldehyde/ketone (Aldol addition), which dehydrates upon heating to an α,β-unsaturated carbonyl (Aldol condensation).
15	In GAMSAT Section III Endocrine Physiology, trace the Hypothalamic-Pituitary-Target Organ axes and distinguish Primary, Secondary, and Tertiary Endocrine Disorders.	Hypothalamus secretes releasing/inhibiting hormones (TRH, CRH, GnRH, GHRH, Dopamine inhibits Prolactin) via hypophyseal portal vessels → Anterior Pituitary secretes tropic hormones (TSH, ACTH, LH/FSH, GH, Prolactin) → Target gland secretes effector hormone (Thyroxine T4/T3, Cortisol, Testosterone/Oestradiol, IGF-1) which exerts Negative Feedback on both pituitary and hypothalamus. Primary disorder = defect in Target Gland (e.g., Primary hypothyroidism: low T4, HIGH TSH). Secondary disorder = defect in Pituitary (low T4, LOW/inappropriately normal TSH). Tertiary disorder = defect in Hypothalamus.
16	In GAMSAT Section III Organic Chemistry, compare the SN1 and SN2 Nucleophilic Substitution mechanisms across kinetics, stereochemistry, substrate preference, nucleophile, and solvent.	SN1 (Unimolecular, 2-step via planar Carbocation intermediate): Rate = k[Substrate]; favours 3° > 2° >> 1° (carbocation stability via hyperconjugation/inductive effect and resonance); produces a Racemic Mixture (50% retention + 50% inversion of configuration); favoured by weak nucleophiles and Polar Protic solvents (H2O, ROH) that stabilize the carbocation and leaving group. SN2 (Bimolecular, 1-step concerted backside attack): Rate = k[Substrate][Nucleophile]; favours Methyl > 1° > 2° (steric hindrance blocks 3°); causes 100% Walden Inversion of stereochemistry (R ↔ S); favoured by strong nucleophiles and Polar Aprotic solvents (DMSO, Acetone, DMF, Acetonitrile).
17	In GAMSAT Section III Neurophysiology, use the Nernst and Goldman-Hodgkin-Katz concepts to explain Resting Membrane Potential (-70 mV) and the phases of a Neuronal Action Potential.	Resting potential (-70 mV) is close to the K+ equilibrium potential (E_K ≈ -90 mV) because resting membrane permeability is much higher for K+ (leak channels) than Na+ (E_Na ≈ +60 mV), maintained by the 3 Na+ out / 2 K+ in ATPase pump. Action Potential: 1) Depolarization to threshold (-55 mV) opens fast voltage-gated Na+ channels → rapid Na+ influx drives Vm toward +30/+40 mV; 2) At peak, Na+ inactivation gates close (causing the Absolute Refractory Period where no second AP can fire) and delayed voltage-gated K+ channels open; 3) K+ efflux repolarizes and briefly hyperpolarizes (Relative Refractory Period) the membrane toward E_K.
18	In GAMSAT Section III Sound & Waves, state the Decibel (dB) logarithmic sound intensity formula and the Doppler Effect equation.	Sound Intensity Level β (in dB) = 10 · log10(I / I0), where I0 = 10^-12 W/m^2. Every +10 dB increase represents a 10-fold (10^1) increase in intensity I; every +20 dB is a 100-fold (10^2) increase; every +3 dB represents a doubling (×2) of intensity. Since I = P / (4πr^2), doubling distance r reduces intensity to 1/4 (-6 dB). Doppler Effect: f_observed = f_source · [(v_wave ± v_observer) / (v_wave ∓ v_source)] (use top signs when moving TOWARD each other → higher frequency; bottom signs when moving AWAY → lower frequency).
19	In GAMSAT Section III Graph & Nomogram Interpretation, how do you read a Semi-Logarithmic, Log-Log, or Ternary (Triangular Phase) Diagram quickly under exam pressure?	Semi-log plot (log Y vs. linear X): an exponential relationship y = A·e^(kx) plots as a straight line; each tick mark step on the log axis multiplies the value by a constant factor (e.g., ×10). Log-Log plot (log Y vs. log X): a power law y = a·x^n plots as a straight line whose slope equals the exponent n. Ternary diagram (3 components A, B, C summing to 100%): each apex represents 100% of that pure component, and the base opposite that apex represents 0%; read parallel gridlines running parallel to the opposite base.
20	In GAMSAT Section III DC Circuits (and Neuronal Membrane RC Models), state rules for Resistors and Capacitors in Series vs. Parallel and the RC Time Constant τ.	Resistors in Series: R_eq = R1 + R2; in Parallel: 1/R_eq = 1/R1 + 1/R2 = (R1·R2)/(R1+R2). Capacitors (C = Q/V = εA/d) follow the OPPOSITE rule: in Parallel: C_eq = C1 + C2; in Series: 1/C_eq = 1/C1 + 1/C2. In an RC circuit (like a neuron's lipid bilayer capacitance C_m in parallel with ion channel resistance R_m), the Time Constant τ = R · C is the time required to charge the capacitor to 63.2% (1 - e^-1) of V_max or discharge to 36.8% (e^-1).
21	In GAMSAT Section III Organic Chemistry, compare E1 and E2 Elimination reactions and state Zaitsev's Rule vs. Hofmann's Rule.	E1 (Unimolecular, 2-step via carbocation intermediate, competes with SN1 using weak base + heat): Rate = k[Substrate], favours 3° > 2°. E2 (Bimolecular, 1-step concerted proton abstraction + leaving group departure): Rate = k[Substrate][Strong Base]; requires strictly ANTI-PERIPLANAR (180° dihedral angle) geometry between the β-hydrogen and the leaving group (e.g., trans-diaxial in cyclohexane chairs). Zaitsev's Rule: small unhindered bases (NaOEt, KOH) yield the MORE substituted (more stable) alkene. Hofmann's Rule: bulky sterically hindered bases (tert-butoxide, LDA) abstract the least hindered proton to yield the LESS substituted (terminal) alkene.
22	How do Electron-Withdrawing Groups (EWGs) vs. Electron-Donating Groups (EDGs) affect the Acidity (Ka and pKa) of Carboxylic Acids and Phenols?	Stronger acid = LARGER Ka = SMALLER pKa. Any substituent that stabilizes the negatively charged conjugate base (A-) increases acidity: Electron-Withdrawing Groups (-NO2, -CN, -CF3, halogens -F > -Cl > -Br > -I) pull electron density away via Inductive (-I) and/or Resonance (-M) effects, stabilizing the carboxylate/phenoxide anion and LOWERING pKa (this inductive effect diminishes rapidly with distance down the carbon chain). Electron-Donating Groups (alkyl groups -CH3, -OCH3) destabilize the anion and RAISE pKa.
23	In GAMSAT Section III Electrochemistry, how do you use the Nernst Equation to find cell potential under non-standard concentrations at 25°C (298 K)?	Standard cell potential: E°cell = E°red(cathode) - E°red(anode), and ΔG° = -n·F·E°cell. At 298 K, the Nernst Equation is: E_cell = E°cell - (0.0592 / n) · log10(Q), where n is moles of electrons transferred and Q is the reaction quotient [Products]/[Reactants]. In a Concentration Cell (identical electrodes, E°cell = 0 V), current flows spontaneously from the dilute half-cell (anode, oxidized to raise concentration) to the concentrated half-cell (cathode, reduced to lower concentration) until concentrations equalize (E_cell = 0 at equilibrium).
24	In GAMSAT Section III Acid-Base Physiology, interpret a Davenport Diagram (Plasma [HCO3-] vs. pH with PaCO2 isobars).	Normal centre point: pH = 7.4, [HCO3-] = 24 mmol/L, PaCO2 = 40 mmHg. Moving along the normal buffer line up-and-left (low pH, high HCO3-, high PaCO2 isobar) = Uncompensated Respiratory Acidosis; compensation by kidneys retaining HCO3- moves vertically UP toward pH 7.4. Moving down-and-left along the 40 mmHg PaCO2 isobar (low pH, low HCO3-) = Uncompensated Metabolic Acidosis; respiratory compensation (hyperventilation) moves down-and-right to a lower PaCO2 isobar toward pH 7.4.
25	In GAMSAT Section III Enzyme Kinetics, interpret a Michaelis-Menten curve and a Lineweaver-Burk double-reciprocal plot (1/V0 vs. 1/[S]).	Michaelis-Menten equation: V0 = (Vmax · [S]) / (Km + [S]), where Km is the substrate concentration at which V0 = 1/2 Vmax (lower Km = higher enzyme affinity for substrate). Lineweaver-Burk equation: 1/V0 = (Km / Vmax)(1/[S]) + 1/Vmax. Y-intercept = 1/Vmax; X-intercept = -1/Km; Slope = Km/Vmax. Competitive inhibition: lines intersect on the Y-axis (same Vmax, apparent Km increases so X-intercept moves closer to 0). Non-competitive inhibition: lines intersect on the X-axis (same Km, Vmax decreases so Y-intercept moves higher).
26	In GAMSAT Section I (Reasoning in Humanities and Social Sciences), how do you distinguish Irony, Satire, Sarcasm, and Paradox in literary or political cartoons?	Verbal/Situational Irony: contrast between literal expression/expectation and actual meaning/outcome. Satire: use of humour, exaggeration, ridicule, or irony to expose and critique societal or political vices/folly with the aim of reform. Sarcasm: sharp, bitter verbal irony directed personally to mock or wound. Paradox: a seemingly self-contradictory statement that reveals a deeper underlying truth upon reflection.
27	In GAMSAT Section III Mental Math, how do you quickly estimate pH from [H+] = 3.2 × 10^-5 M without a calculator using logarithmic approximations?	Remember log10(2) ≈ 0.30, log10(3) ≈ 0.48, log10(5) ≈ 0.70. For [H+] = a × 10^-n M, pH = n - log10(a). Thus for [H+] = 3.2 × 10^-5 M, pH ≈ 5 - log10(3.2) ≈ 5 - 0.50 = 4.50.
28	In GAMSAT Section III Optics, apply the Thin Lens / Mirror Equation (1/f = 1/do + 1/di) and Magnification (M = -di/do = hi/ho) with sign conventions.	Focal length f: POSITIVE for converging (convex lens / concave mirror); NEGATIVE for diverging (concave lens / convex mirror). Image distance di: POSITIVE for Real images (formed on opposite side of lens, inverted, M < 0); NEGATIVE for Virtual images (formed on same side of lens as object, upright, M > 0). Lens Optical Power in Dioptres: P = 1 / f (with f in meters). Diverging lenses ALWAYS form virtual, upright, diminished (SUV) images regardless of object distance.
29	In GAMSAT Section III Cardiac Physiology, interpret a Left Ventricular Pressure-Volume (PV) Loop and how Preload, Afterload, and Inotropy (Contractility) shift the loop.	4 phases counter-clockwise: 1) Diastolic filling (mitral valve opens → closes at End-Diastolic Volume EDV), 2) Isovolumetric Contraction (all valves closed, vertical rise in pressure), 3) Systolic Ejection (aortic valve opens → closes at End-Systolic Volume ESV), 4) Isovolumetric Relaxation (vertical drop in pressure). Stroke Volume SV = EDV - ESV (width of loop); Ejection Fraction EF = SV / EDV; Cardiac Work = area inside loop. Increased Preload stretches right edge (higher EDV → higher SV via Frank-Starling law). Increased Afterload (aortic pressure) raises loop height and increases ESV (reducing SV). Increased Inotropy shifts the End-Systolic Pressure-Volume Relationship (ESPVR line) left, decreasing ESV and increasing SV.
30	In GAMSAT Section III Stereochemistry, how do you calculate the maximum number of Stereoisomers for a molecule with n chiral centres, and distinguish Enantiomers, Diastereomers, and Meso Compounds?	Maximum stereoisomers = 2^n (where n = number of chiral sp3 carbons with 4 different groups). Enantiomers: non-superimposable mirror images (opposite R/S configuration at ALL chiral centres; identical physical/chemical properties in achiral environments except they rotate plane-polarized light in equal and opposite directions; 50:50 racemic mixture is optically inactive). Diastereomers: stereoisomers that are NOT mirror images (opposite configuration at some, but not all, chiral centres; have DIFFERENT physical properties like melting point/solubility). Meso Compound: has ≥2 chiral centres AND an internal plane of symmetry, making it achiral and optically inactive (reduces stereoisomer count below 2^n).
31	In GAMSAT Section I poetry and prose analysis, compare Metaphor, Metonymy, Synecdoche, Allusion, and Juxtaposition.	Metaphor: implicit comparison equating two unrelated things. Metonymy: substituting an attribute or closely associated concept for the thing itself (e.g., 'Canberra' for the Australian Federal Government, 'the Crown' for the monarchy). Synecdoche: a part represents the whole, or the whole represents a part (e.g., 'all hands on deck'). Allusion: indirect reference to a historical, mythological, biblical, or literary work. Juxtaposition: placing two contrasting ideas/images side-by-side to highlight their differences.
32	In GAMSAT Section III Gas Laws & Colligative Properties, state the Ideal Gas Law, Dalton's Law of Partial Pressures, Graham's Law of Effusion, and Osmotic Pressure.	Ideal Gas Law: PV = nRT (at STP 0°C/1 atm, 1 mol = 22.4 L; real gases deviate from ideal behaviour at HIGH pressure and LOW temperature due to finite molecular volume and intermolecular attractions). Dalton's Law: P_total = Σ P_i = Σ (X_i · P_total). Graham's Law: Rate1 / Rate2 = √(M2 / M1) (lighter gases effuse/diffuse faster). Osmotic Pressure: Π = i·M·R·T (where i = van 't Hoff dissociation factor, e.g., i=2 for NaCl, i=3 for CaCl2).