Physical and Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with new chemical properties, such as rusting of iron or tarnishing of a penny.

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, such as melting, freezing, or cutting.

Front

Can you give an example of a chemical change?

Back

An example of a chemical change is a penny tarnishing.

Front

Can you give an example of a physical change that is not a change of state?

Back

An example of a physical change that is not a change of state is paper being cut.

Front

What is the best method to separate a mixture of sugar, sand, and water?

Back

The best method is to filter the sand from the sugar and water, then heat the mixture to evaporate the water.

Front

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

Back

During a chemical change, the properties of the original substances change, and new substances with different properties are formed.

Front

What is an example of a physical change involving a change of state?

Back

An example of a physical change involving a change of state is butter melting.

Front

What type of change can be easily reversed?

Back

A physical change can be easily reversed.

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 example of a reversible physical change?

Back

An example of a reversible physical change is freezing water to make ice.