"Describe and explain" questions — AQA A-Level Chemistry (7405)
25 questions · chemistry · View as Markdown
How to answer
"describe and explain" questions from AQA A-Level Chemistry (7405). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.
Sample questions
- Bromoethane can be converted into ethanol by reacting it with aqueous sodium hydroxide solution. Describe and explain wh…
- Ethene is produced by cracking long-chain hydrocarbons. Ethene can be used as a monomer to make poly(ethene). Describe t…
- Ethanol can be produced by the fermentation of sugar solutions using yeast. Describe the conditions needed for fermentat…
- A student adds bromine water to two test tubes, one containing hexane and one containing ethene. Describe what the stude…
- A student investigates how changing the concentration of hydrochloric acid affects the rate of reaction with marble chip…
- Describe the process of catalytic cracking and explain why cracking is a necessary industrial process.
- Alkanes and alkenes are both hydrocarbons produced during cracking. Describe how bromine water can be used to distinguis…
- Chloroethane can be made by reacting ethane with chlorine in the presence of ultraviolet light. Describe what happens du…