Physical vs. Chemical Change

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 melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and digestion.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without changing its chemical composition.

Front

What happens to the mass of a substance during a physical change?

Back

The mass of a substance remains the same during a physical change.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is not created or destroyed in a chemical reaction; it is only transformed.

Front

What is an example of a sign that a chemical change has occurred?

Back

Formation of a gas is a sign that a chemical change has occurred.

Front

What is an example of a physical change?

Back

An example of a physical change is chopping wood.

Front

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

Back

A physical property can be observed without changing the substance's chemical identity, while a chemical property can only be observed during a chemical reaction.

Front

What happens to the texture of chocolate when it is melted?

Back

The texture of chocolate changes when it is melted, but its mass remains the same.

Front

What is an example of a chemical change in food?

Back

Digestion of food is an example of a chemical change.