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 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 the breaking and forming of bonds. Examples include rusting, burning, and digestion.

Front

Is melting ice a chemical or physical change?

Back

Melting ice is a physical change.

Front

Is rusting of iron a chemical or physical change?

Back

Rusting of iron is a chemical change.

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What happens to the molecules during a physical change?

Back

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

Front

What happens to the molecules during a chemical change?

Back

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

Front

Give an example of a physical change.

Back

An example of a physical change is the melting of ice into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is the combustion of wood in a fire.

Front

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

Back

The main difference is that a physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.