"Describe" questions — WJEC A-Level Chemistry (Wales)
25 questions · chemistry · View as Markdown
How to answer
Say WHAT happens, in order. No reasoning. Structure: 1. First X. 2. Then Y. 3. Then Z. Assessment Objective: AO1. Every "describe" answer on this spec is marked against exactly this pattern.
Sample questions
- Methanoic acid (HCOOH) is the simplest carboxylic acid. It is found in ant venom and reacts with a range of substances. …
- Ethanol (C₂H₅OH) and 1-bromopropane (CH₃CH₂CH₂Br) are both organic compounds. Describe the key structural features that …
- Proteins are large molecules that are essential for life. Describe the structure of a protein, starting from its amino a…
- Butanedioic acid is a dicarboxylic acid found in unripe fruit. It reacts with sodium carbonate solution. Describe what y…
- A pharmaceutical company produces a new painkiller tablet. Quality control chemists need to check that the tablet contai…
- Carboxylic acids can react with alcohols to form esters in a process called esterification. Pentyl methanoate is an este…
- A student uses crystallisation to obtain a sample of copper sulfate crystals from a copper sulfate solution. Describe th…
- A student wants to produce ethyl ethanoate, an ester, starting from ethanol and ethanoic acid. Describe how the student …