Question

1. which of the following is an example of a chemical change? *

shaving your head
cutting branches off a tree
fireworks going off
spreading butter on toast

Explanation:

A chemical change results in the formation of new substances with different chemical properties. Spreading butter on toast is a physical change (change in state and appearance only). Cutting branches off a tree and shaving your head are physical changes as they only change the physical form of the objects. Fireworks going off involve combustion reactions, which produce new substances like gases and light, indicating a chemical change.

Answer:

fireworks going off