Unit 3 Matter

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

What is a physical change?

Back

A physical change is a change in the size, shape, or state of matter without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

Is hammering wood together to build a house a chemical or physical change?

Back

It is a physical change.

Front

What is the definition of a chemical change?

Back

Any change that results in the formation of new chemical substances.

Front

What happens to energy in an exothermic reaction?

Back

Energy is released into the surroundings.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not create new substances, while a chemical change does.

Front

Can matter be created or destroyed in a chemical reaction?

Back

No, matter cannot be created or destroyed; it can only change form.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.