Chemistry is

The only sure evidence for a chemical reaction is

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

CaCO3 represents a chemical

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

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

What type of reaction is FeS + 2 HCl FeCl2 + H2S?

What happens when chemical bonds break and new bonds form?

A shorter, easier way to show a chemical reaction, using symbols 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

When a chemical reaction takes place in an open system,

Physical changes occur when existing bonds break and new bonds form.

The amount of matter in a chemical reaction changes.

Synthesis is the process of making a more complex compound from simpler substances.

A precipitate is a(n) ____________________ that forms from solution during a chemical reaction.

In a chemical equation, the substances written on the right side of the arrow are called ____________________.

The _________________________ is the minimum amount of energy that must be added to start a chemical reaction.

The ____________________ is the amount of one material present in a given volume of another material.

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