"Explain" questions — Eduqas GCSE Chemistry
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
- Copper has two naturally occurring isotopes: copper-63 and copper-65. Explain why the relative atomic mass of copper is …
- Silicon has three naturally occurring isotopes: silicon-28, silicon-29, and silicon-30. The relative atomic mass of sili…
- A student has an unknown solution that may contain one or more of the following ions: carbonate ions, sulfate ions, or h…
- Magnesium has three naturally occurring isotopes: magnesium-24, magnesium-25, and magnesium-26. The relative atomic mass…
- A student adds a small piece of marble (calcium carbonate) to excess hydrochloric acid. The reaction produces carbon dio…
- Ethene (C₂H₄) is a hydrocarbon produced during the cracking of long-chain alkanes. Ethene can react with bromine water. …
- Boron has two naturally occurring isotopes, boron-10 and boron-11. The relative atomic mass of boron is 10.8. Explain wh…
- A chemist is given two samples of a liquid. Sample A is described as pure ethanol. Sample B is described as a mixture of…