Physical and Chemical Changes

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. Examples include changes in state (like melting or freezing), shape, or size.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes changes such as rusting, burning, or cooking.

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas, change in color, temperature change, or the production of light are signs that a chemical reaction has occurred.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Melting butter for popcorn is a physical change because it does not change the chemical composition of the butter.

Front

Which of the following is NOT an example of a physical change?

Back

Rust is NOT an example of a physical change; it is a chemical change.

Front

What happens during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What is an example of a physical change?

Back

Evaporating water is an example of a physical change.

Front

What is an example of a chemical change?

Back

Baking a cake is an example of a chemical change because it involves a chemical reaction that produces new substances.

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 indicator of a chemical change?

Back

An indicator of a chemical change can include the formation of a gas, a change in color, or the release of heat.