7-PS1-2

Front

What is a Chemical Change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes.

Front

What is a Physical Change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an example of a Chemical Change?

Back

Burning wood, which produces ash, smoke, and gases.

Front

What is an example of a Physical Change?

Back

Melting ice into water, which can be reversed.

Front

What happens to atoms during a Chemical Change?

Back

Atoms are rearranged, forming new bonds and creating new substances.

Front

What is an Endothermic Reaction?

Back

A reaction that absorbs energy from its surroundings, often resulting in a temperature drop.

Front

What is an Exothermic Reaction?

Back

A reaction that releases energy, usually in the form of heat, causing a temperature increase.

Front

How can you identify a Chemical Change?

Back

Look for signs such as color change, gas production, temperature change, or formation of a precipitate.

Front

What is a Precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the Law of Conservation of Mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.