Question 1
What is the pH of 0.0250 mol L⁻¹ hydrochloric acid at 25 °C?
QCE Chemistry, Units 3 and 4.
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Four topics, two papers
Built for QCE Chemistry Units 3 and 4 on the QCAA Chemistry 2025 syllabus: the four topics the external examination assesses.
Unit 3 Topic 1: Chemical equilibrium systems
Unit 3 Topic 2: Oxidation and reduction
Unit 4 Topic 1: Properties and structure of organic materials
Unit 4 Topic 2: Chemical synthesis and design
| Paper | What it asks | Time |
|---|---|---|
| Paper 1 | Multiple choice, single words, sentences or paragraphs, calculations and unseen stimulus on Units 3 and 4. | 5 minutes perusal, 90 minutes working |
| Paper 2 | A mix of question types on Units 3 and 4, with calculations and unseen stimulus (graphs, tables or diagrams). | 5 minutes perusal, 90 minutes working |
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