Question 1
The energy profile diagram is for a reaction that, once started at room temperature, goes essentially to completion. Which statement best explains why the reverse reaction does not occur to any noticeable extent?
WACE Chemistry, Units 3 and 4.
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Five topics, one three-hour paper
Built for Chemistry ATAR Units 3 and 4 in Western Australia on the SCSA Year 12 syllabus: the five areas of Unit 3 and Unit 4 the ATAR examination samples.
Topic 1: Chemical equilibrium systems
Topic 2: Acids and bases
Topic 3: Oxidation and reduction
Topic 4: Properties and structure of organic materials
Topic 5: Chemical synthesis
| Section | What it asks | Time |
|---|---|---|
| Section One | Multiple choice: 25 questions on Units 3 and 4. | 25% of the examination, about 50 minutes |
| Section Two | Short answer: 8 to 12 questions answered with equations, descriptions, short calculations, diagrams, tables, graphs or flow charts. | 35% of the examination, about 60 minutes |
| Section Three | Extended answer: 5 to 7 questions, each in parts on a scenario such as a passage or experimental data. | 40% of the examination, about 70 minutes |
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