Which food uses a reagent?

Metals, like iron, rust easily when exposed to chemical. Why do iron rusts? It is because it reacts with _ _ _ _ _ _ in the air.

Classify the examples below:

There is no new substance formed in a chemical change.

multiplem://Which of the following involves chemical change?

Rubber bands are useful materials in securing things tightly because they can be stretched and can go back to their original shape. What property do rubber bands have?

Practicing reforestation or planting more trees prevents harm in our environment.

Which of the following is correct?