Chemical Reactions Quiz

What do chemical reactions form when hydrogen and oxygen react?

• Carbon dioxide

• Methane

• Water

• Ammonia

What are the substances called that change into new substances during a chemical reaction?

• Products

• Reactants

• Catalysts

• Enzymes

Which of the following is an example of a chemical reaction releasing energy?

• Photosynthesis

• Rusting of iron

• Burning wood

• Melting ice

What is one way chemical reactions are important to us?

• They help us understand how matter changes and interacts.

• They create new elements.

• They stop energy from being absorbed.

• They prevent rusting.

Which process is an example of a chemical reaction that absorbs energy?

• Combustion

• Photosynthesis

• Freezing water

• Evaporation