What is the law of conservation of mass?

• Matter cannot be created or destroyed during chemical reactions.

• Matter can be created during chemical reactions.

• Matter can be destroyed during chemical reactions.

• Matter is always created and destroyed during chemical reactions.

Which of the following is a product in the chemical reaction of photosynthesis?

• Glucose

• Carbon dioxide

• Water

• Sunlight

What does the arrow in a chemical equation represent?

• Yields

• Equals

• Subtracts

• Adds

In the reaction that forms rust, what are the reactants?

• Iron and oxygen gas

• Iron and water

• Oxygen gas and water

• Iron and hydrogen

Chemical reactions occur when one or more substances are converted to one or more different substances. True or False?

• True

• False

Explain how the conservation of mass is demonstrated in the process of photosynthesis.