Question

which is not a chemical change?
a) stirring ingredients together in a salad
b) a bar of iron rusts.
c) an egg is cooked.
d) a piece of wood is burned.

Explanation:

A chemical change results in a new substance being formed. Stirring salad ingredients just mixes them physically without creating new substances. Rusting of iron forms iron - oxide, cooking an egg denatures proteins creating new substances, and burning wood forms ash and gases like carbon - dioxide.

Answer:

A. Stirring ingredients together in a salad