ATARMAxxing · Chemistry
HSC Chemistry Practice Questions
64 exam-style questions · full worked solutions
The 64 practice questions inside the HSC Chemistry Mastery Pack, grouped by area of study. Every question comes with a full worked solution.
- Mod 5 – Equilibrium and Acid Reactions
- Multiple choice × 12
- Write × 1
- Calculate × 1
- Explain × 1
- Analyse × 1
- Mod 6 – Acid/Base Reactions
- Multiple choice × 12
- Calculate × 2
- Analyse × 1
- Assess × 1
- Mod 7 – Organic Chemistry
- Multiple choice × 12
- Identify × 1
- Explain × 1
- Calculate × 1
- Analyse × 1
- Mod 8 – Applying Chemical Ideas
- Multiple choice × 12
- Analyse × 1
- Interpret × 1
- Assess × 1
- Calculate and Explain × 1
Sample question
A sealed 2.0 L vessel contains a mixture at equilibrium for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). At equilibrium the vessel holds 0.20 mol N2, 0.40 mol H2 and 0.60 mol NH3. What is the value of the equilibrium constant Kc?
- A. 4.5
- B. 28
- C. 113
- D. 375
Show the worked answer
Answer: C
Convert to concentrations (divide by 2.0 L): [N2]=0.10, [H2]=0.20, [NH3]=0.30 mol/L. Kc = [NH3]^2 / ([N2][H2]^3) = (0.30)^2 / (0.10 × (0.20)^3) = 0.090 / (0.10 × 0.0080) = 0.090 / 0.00080 = 113.
Included in the HSC Chemistry Mastery Pack
20 full-length practice exams with worked solutions, 20 revision notes, 64 practice questions and 200 flashcards.
Preview a sample note and question free on the HSC Chemistry hub →