"Explain" questions — Eduqas A-Level Chemistry
115 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
- The reaction between hydrogen and iodine reaches a dynamic equilibrium in a closed container. H₂(g) + I₂(g) ⇌ 2HI(g) W…
- Ethene (C₂H₄) is a hydrocarbon. A student states: 'When ethene burns completely in oxygen, the total mass of the product…
- A student uses paper chromatography to separate the coloured pigments in a sample of black ink. After running the chroma…
- Pent-2-ene can exist as cis and trans stereoisomers. Explain why pent-2-ene can form cis and trans isomers, and state on…
- Elements in the periodic table are arranged in periods and groups. Explain what is meant by the terms 'period' and 'grou…
- Zinc reacts with sulfuric acid according to the equation: Zn + H₂SO₄ → ZnSO₄ + H₂. A student adds a small amount of zinc…
- When copper carbonate is heated, it decomposes to form copper oxide and carbon dioxide gas. A student heats 6.2 g of cop…
- Aldehydes and ketones are two families of organic compounds that contain the carbonyl group. Explain how the structure o…