The only sure evidence for a chemical reaction is

CaCO3 represents a chemical

What happens when chemical bonds break and new bonds form?

A shorter, easier way to show a chemical reaction, using smbols instead of words, is called a

The substances listed on the left side of a chemical equation are the

A chemical reaction that absorbs energy in the form of heat is described as

The minimum amount of energy needed to start a reaction is the

Every chemical reaction involves a change in

Acids have a

Bases have a

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