Front

What do sodium and chlorine form when they combine?

Back

Salt.

Front

What happens during a chemical reaction?

Back

Chemicals combine to form a new substance.

Front

When do chemical reactions occur?

Back

When electrons hook together.

Front

What is an example of a chemical reaction?

Back

Baking a cake.

Front

What happens when electrons combine with other electrons?

Back

Energy is given off.

Front

What is a chemical reaction?

Back

A process where substances combine or break apart to form new substances.

Front

What is the role of electrons in chemical reactions?

Back

Electrons interact and rearrange to form new bonds.

Front

What is formed when hydrogen and oxygen combine?

Back

Water.

Front

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

Back

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

Front

What is an example of a physical change?

Back

Melting ice.