Chemistry is

The only sure evidence of a chemical reaction is

A material used to decrease the rate of a chemical reaction is called a(n)

CaCO₃ represents a chemical

Which is the correct chemical equation for: Sodium reacts with oxygen to create sodium oxide.

The principle of conservation of mass is true

In chemical reactions, what does the principle of conservation of mass mean?

Chemicals that react as biological catalysts by speeding up reactions in living things are called

Which of the following is an example of how to supply activation energy to begin a reaction?

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of

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