Question

Which activity is an example of a chemical change?

Dissolving table sugar in water.
Drops of water forming on a cup of iced tea on a hot day.
Melting gold to make jewelry.
An old penny rusting.

Answer 1

An old penny rusting

Step-by-step explanation:

A penny forming rust is the penny being chemically altered and changing form as opposed to dissolving sugar in water, which is still sugar, just mixed with water. It doesn't change the chemical makeup of the water or sugar.