Question

which of these is an example of a physical change? all of these sodium reacting with water dissolving salt in water baking bread

Explanation:

A physical change is a change in which the form or appearance of matter changes, but not its chemical composition. Dissolving salt in water is a physical change as salt can be recovered by evaporation and no new chemical substances are formed. Sodium reacting with water is a chemical reaction forming new substances (sodium hydroxide and hydrogen). Baking bread involves chemical reactions like the decomposition of baking - soda and the Maillard reaction.

Answer:

Dissolving salt in water