"Explain" questions — Cambridge International IGCSE Chemistry (0620)
100 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
- Explain the difference between an exothermic reaction and an endothermic reaction, and give one example of each type of …
- Propanoic acid is a carboxylic acid used as a food preservative. Explain why propanoic acid is described as a weak acid,…
- Hydrogen peroxide decomposes into water and oxygen when manganese(IV) oxide is added as a catalyst. A student measures t…
- A farmer wants to use ammonium sulfate as a fertiliser on a field of wheat. State what type of compound ammonium sulfate…
- Zinc powder is added to copper(II) sulfate solution. The blue colour of the solution fades and a reddish-brown solid for…
- Explain how the number of protons, neutrons and electrons in an atom determines its atomic number, mass number and overa…
- Explain why increasing the temperature of a reaction mixture increases the rate of a chemical reaction.
- A small amount of perfume is sprayed at one end of a long room. After a few minutes, the scent can be detected at the ot…