Physical and Chemical Properties of Matter

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. It involves a chemical reaction and changes the molecular structure of the substance. Examples include rusting, burning, and baking.

Front

Is rusting a chemical or physical change?

Back

Rusting is a chemical change.

Front

Is melting ice a chemical or physical change?

Back

Melting ice is a physical change.

Front

What happens to the motion of molecules when a liquid is heated?

Back

When a liquid is heated, the energy increases and the motion of the molecules speeds up.

Front

What is an example of a chemical change?

Back

Baking a cake is an example of a chemical change.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes the production of gas, color change, temperature change, and the formation of a precipitate.

Front

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

Back

The properties of a substance may change, but its chemical composition remains the same.

Front

What is an example of a physical change?

Back

An example of a physical change is tearing paper.

Front

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

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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.