Question

2a what event is occuring? 2b circle chemical change or physical change 5a what event is occuring? 5b circle chemical change or physical change

Explanation:

For 2a, two clear - liquids are combined to form a solid precipitate, which is a chemical reaction resulting in a new substance. For 2b, since a new substance is formed from the reaction of two liquids, it is a chemical change. For 5a, the liquid level in the beaker decreases likely due to evaporation, which is a change of state from liquid to gas. For 5b, evaporation is a physical change as it only involves a change of state and no new substances are formed.

Answer:

2a. A chemical reaction (precipitation) is occurring.
2b. Chemical Change
5a. Evaporation is occurring.
5b. Physical Change