"Describe and explain" questions — WJEC A-Level Chemistry (Wales)
16 questions · chemistry · View as Markdown
How to answer
"describe and explain" questions from WJEC A-Level Chemistry (Wales). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.
Sample questions
- Bromoethane can undergo a substitution reaction with potassium cyanide solution to form a new organic compound. Describe…
- Alkanes and alkenes are two families of hydrocarbons. Describe how bromine water can be used to distinguish between an a…
- A student has a sample of propanal and a sample of propanone. She wants to confirm which sample is which using a chemica…
- Ethanol is an alcohol that can be produced by the fermentation of glucose. Describe the fermentation process and explain…
- Ethanoic acid is a carboxylic acid. Describe what happens when ethanoic acid reacts with sodium carbonate solution, and …
- Mendeleev developed an early version of the periodic table. Describe how Mendeleev arranged the elements in his periodic…
- Chlorine, bromine and iodine are all elements in Group 7 of the periodic table. Describe how the reactivity of the Group…
- Ethanol is an alcohol that can be produced by fermentation. Describe what is meant by fermentation and explain why ethan…