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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

Mowing the lawn is an example of a physical change, as it alters the appearance of the grass without changing its chemical structure.

Front

Give an example of a chemical change.

Back

Corroding metal is an example of a chemical change, as it involves a reaction with oxygen that produces rust.

Front

What happens during a chemical change?

Back

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

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

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

Freezing chocolate covered bananas is an example of a reversible physical change, as they can be thawed back to their original state.

Front

What is an example of an irreversible chemical change?

Back

Burning wood is an example of an irreversible chemical change, as it produces ash and gases that cannot be converted back to wood.

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.