"Explain" questions — Pearson Edexcel International GCSE Chemistry (4CH1)
83 questions · chemistry · View as Markdown
How to answer
WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.
Sample questions
- A student prepares a sample of copper(II) sulfate solution by adding dilute sulfuric acid to an excess of copper(II) car…
- When ammonium chloride dissolves in water, the temperature of the water decreases. Explain what this temperature change …
- Explain why two atoms of the same element can have different mass numbers.
- The reaction between hydrogen and iodine vapour is reversible. In a closed container, the following reaction reaches dyn…
- Ethene and ethane are both hydrocarbons that can be produced from crude oil. Explain why ethene is described as an unsat…
- Magnesium oxide is an ionic compound with a giant lattice structure. Explain why magnesium oxide has a high melting poin…
- Explain why a substance in the gaseous state diffuses much more quickly than the same substance in the liquid state.
- Lead, carbon and gold are three substances found in the reactivity series. A student heats lead oxide with carbon in a c…