Physical & Chemical Changes

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio, such as CH₃CHO.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as water freezing into ice.

Front

What is a chemical change?

Back

A chemical change is a process that involves the transformation of one or more substances into different substances, such as baking cookies.

Front

Which state of matter has the most energy?

Back

Gas has the most energy compared to solids and liquids.

Front

What is an example of a physical change?

Back

Crumpling paper is an example of a physical change.

Front

What is an example of a chemical reaction?

Back

Cookies baking in an oven is an example of a chemical reaction.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules rearrange to form new substances with different chemical properties.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What is an example of a substance that undergoes a chemical change?

Back

Sour milk is an example of a substance that undergoes a chemical change.