Question Constellation Sign up for free AQA · GCSE · Chemistry · Higher
Observing potassium reacting with water
Group 1 elements react with water.
Give two observations made when potassium reacts with water.
Write your answer first. You can study the marking guidance whenever you need it.
Study the marking See what earns credit and compare it with a full-mark answer.
Marking points
- 1 First field gives one distinct credited observation.
- 2 Second field gives a different credited observation.
Full-mark answer
1. The potassium floats and moves around on the water. 2. It melts to form a ball and fizzes.
Why this answer loses marks
Gas is produced and it is reactive.
Those are inferences, not two distinct things seen during the reaction.