Physical and Chemical Properties and 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 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 burning, rusting, and digestion.

Front

Is hammering wood together to build a house a chemical or physical change?

Back

Physical change.

Front

What is density?

Back

Density is a physical property that measures how much mass is contained in a given volume. It is calculated by dividing mass by volume (Density = Mass/Volume).

Front

Is density a chemical or physical property?

Back

Physical property.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

Is burning wood a chemical or physical change?

Back

Chemical change.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state (solid, liquid, gas) 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 an example of a physical property?

Back

Examples of physical properties include color, odor, melting point, boiling point, and density.