Question 1
The energy profile diagram is for a reaction in a sealed flask. What is the activation energy of the reverse reaction?
WACE Chemistry practice questions by topic
Original questions for every topic, with worked explanations and feedback on written answers.
| Multiple choice | Worked or timed |
|---|---|
| Short and extended answers | Calculations and explanations on a scenario |
| Written answers | Read against the mark points, with your next step |
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Question 2
What is the pH of 0.0250 mol L⁻¹ hydrochloric acid at 25 °C?
Question 3
| Metal strip | In Zn(NO₃)₂(aq) | In Ni(NO₃)₂(aq) | In Cu(NO₃)₂(aq) |
|---|---|---|---|
| zinc | not tested | dark deposit | dark deposit |
| nickel | no change | not tested | dark deposit |
| copper | no change | no change | not tested |
A student placed strips of three metals in solutions of the nitrates of the other metals and recorded what she saw after ten minutes (table). Which list places the metals from the strongest reducing agent to the weakest?
Question 4
Separate samples of four alcohols are warmed with acidified potassium permanganate solution. Which alcohol leaves the solution purple?
Question 5
In a school laboratory in Bunbury, 12.0 g of ethanoic acid is refluxed with excess ethanol and a little concentrated sulfuric acid. The reaction is CH₃COOH(l) + C₂H₅OH(l) ⇌ CH₃COOC₂H₅(l) + H₂O(l). After purification, 13.2 g of ethyl ethanoate is collected. Molar masses: ethanoic acid 60.05 g mol⁻¹, ethanol 46.07 g mol⁻¹, ethyl ethanoate 88.10 g mol⁻¹. What is the percentage yield?
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Are past papers still useful?
Yes, for timing and question style. Check that a question's content is in the current Year 12 syllabus before you rely on it.