Primary Checkpoint. 2026. Science (0097). May - Paper 2 - Question 7

Ahmed makes a lemon volcano.

Ahmed:

- puts half a lemon onto a large plate
- puts a thermometer into the lemon
- measures the temperature of the lemon
- covers the lemon with sodium bicarbonate
- measures the temperature again.

Ahmed labels a picture to show his experiment and his results.



Complete the sentences about the lemon volcano investigation.

Use the picture to help you.

**(c)** New substances are made in the reaction so it is a ___ reaction.