Question

which of these is an example of a chemical change? a. dissolving salt in water b. breaking a piece of plastic in half c. melting iron into a liquid d. setting a piece of paper on fire

Explanation:

A chemical change results in a new substance being formed. Dissolving salt in water is a physical - change as salt can be recovered by evaporation. Breaking plastic is a physical change as it only changes the shape. Melting iron is a physical change as it is a change of state. Setting paper on fire is a chemical change as paper reacts with oxygen to form new substances like ash and carbon - dioxide.

Answer:

D. Setting a piece of paper on fire