Chemical Reactions and Energy Unit Review

Front

What happens to energy when bonds break?

Back

Energy is absorbed.

Front

Electrons have a __________ charge.

Back

negative

Front

What happens to energy when new chemical bonds form?

Back

Energy is released.

Front

A change in a substance that does not involve a change in the identity of the substance is:

Back

physical change.

Front

A mixture that is uniform in its properties throughout is:

Back

Homogeneous mixture.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is an exothermic reaction?

Back

A reaction that releases energy, usually in the form of heat.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings.

Front

What is a reactant?

Back

A substance that takes part in and undergoes change during a reaction.