VCE Chemistry Unit 3+4 practice questions: the 2026 guide

What this guide is for

VCE Chemistry Unit 3-4 is examined through SACs and one end-of-year exam. The exam is the major component (50-60 percent of the study score). This guide covers exam structure, question types, marking criteria, and a six-week preparation routine.

Exam structure

Duration. 2 hours 30 minutes plus 15 minutes reading time.

Total marks. 120.

Section A. 30 multiple-choice questions, 1 mark each. 30 marks.

Section B. Short and extended response. 90 marks.

The exam covers all four areas of study.

Question types

Multiple choice (Section A). Knowledge recall, simple calculations, structure identification.

Short answer (Section B). 2-5 mark items. Specific calculations or short explanations.

Extended response (Section B). 5-10 mark items. Multi-step calculations, longer explanations, sometimes incorporating data analysis.

Marking criteria

VCAA rewards:

1. Correct calculations with appropriate working.
2. Significant figures consistent with the data (typically 3 sig fig).
3. Units (always include).
4. Chemical correctness (equations balanced, formulas correct).
5. Communication (clear scientific writing in explanations).

Top band requires excellence in all five.

Sample questions by Area of Study

Unit 3 AoS 1 (Energy)

Sample. Calculate the energy released when 5.0 g of methane is combusted completely. $\Delta H_c$ of methane = -890 kJ/mol.

Solution. Moles methane = 5.0 g / 16.04 g/mol = 0.312 mol. Energy = 0.312 × 890 = 278 kJ.

Unit 3 AoS 2 (Equilibrium and acids)

Sample. A reaction A + B ⇌ C + D has $K_c = 4.0$ at a given temperature. At equilibrium, [A] = 0.20, [B] = 0.10, [C] = ?. [D] = 0.40.

Solution. $K_c = [C][D] / [A][B]$. $4.0 = [C](0.40) / (0.20)(0.10) = 20[C]$. $[C] = 0.20$ M.

Unit 4 AoS 1 (Organic)

Sample. Identify the IUPAC name of (CH3)2CHCH2CH(CH3)CH2OH.

Solution. Longest chain with -OH: 5 carbons starting from OH end. OH on C1 (after numbering to give OH lowest locant). Branches: methyl on C2 (or higher; check both directions). Final: 2,4-dimethylpentan-1-ol.

Unit 4 AoS 2 (Food chemistry)

Sample. Distinguish between saturated and unsaturated fats at the molecular level. State one health implication.

Solution. Saturated: triglycerides with no C=C double bonds in the fatty acid tails. Solid at room temperature. Found in animal fats. Unsaturated: triglycerides with one (mono-) or more (poly-) C=C in the fatty acid tails. Liquid at room temperature. Found in plant oils. Health: saturated fats associated with increased LDL cholesterol; unsaturated fats associated with health benefits.

Practice routine

Weeks 1-2 of revision. Key knowledge review. Use VCAA Study Design as checklist.

Weeks 3-4. Calculation drills. Calorimetry, Kc, pH, titrations, percentage yield.

Week 5. Past papers under timed conditions. Mark against assessor's reports.

Week 6. Weak-area focus. Identify specific knowledge gaps; drill those.

Common errors

Significant figures. 3 sig figs is the convention. Reporting 5 sig figs from 3-sig-fig data signals carelessness.

Units missing. Every numerical answer needs units.

Equations not balanced. Check before writing.

Direction confusion. Markovnikov for HX addition to alkene; oxidation of primary vs secondary alcohols; equilibrium shifts under Le Chatelier.

Forgetting the data booklet. Look up Ka, Kw, electrochemical series rather than guessing.

In one sentence

VCE Chemistry Unit 3-4 exam practice requires mastery of multiple calculation types (calorimetry, Kc and ICE tables, pH for strong/weak acids and buffers, titration, percentage yield, IUPAC nomenclature) with three significant figures and units throughout; the 120-mark single paper (30 multiple choice + 90 short and extended response) is built on the VCAA Study Design 2023-2027 across all four AoS, and a six-week practice routine moving from key-knowledge review through targeted drills to full timed papers secures top scores.