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 changes the chemical composition of the substance. Examples include rusting, burning, and frying an egg.

Front

Is mowing the lawn a physical or chemical change?

Back

Mowing the lawn is a physical change because it alters the appearance of the grass without changing its chemical structure.

Front

Is separating sand and gravel a physical or chemical change?

Back

Separating sand and gravel is a physical change because it involves a physical process of sorting without changing the substances themselves.

Front

Is corroding metal a physical or chemical change?

Back

Corroding metal is a chemical change because it involves a reaction with oxygen or moisture that changes the metal into a different substance.

Front

Is melting ice cream a physical or chemical change?

Back

Melting ice cream is a physical change because it changes from solid to liquid without altering its chemical composition.

Front

Is frying an egg a physical or chemical change?

Back

Frying an egg is a chemical change because it involves cooking, which changes the proteins in the egg and creates new substances.

Front

What happens to the chemical composition during a physical change?

Back

During a physical change, the chemical composition of the substance remains the same; only its physical properties change.

Front

What happens to the chemical composition during a chemical change?

Back

During a chemical change, the chemical composition of the substance changes, resulting in the formation of new substances.

Front

Give an example of a physical change.

Back

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