Which of these is a sign of a chemical reaction?

What do we call substances that are mixed to start a chemical reaction?

Which of these is a product of burning wood?

Rusting of iron is an example of:

Which gas is produced when vinegar and baking soda react?

What is formed when iron reacts with oxygen and water?

What happens to the atoms during a chemical reaction?

Burning of a candle is an example of:

Which gas do plants produce during photosynthesis?

Which process breaks down food in your body using chemical reactions?