Chemical vs Physical 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. Examples include rusting, burning, and digestion.

Front

What happens to the mass of a substance during a physical change?

Back

The mass of a substance remains the same during a physical change.

Front

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

Back

The mass of a substance is conserved during a chemical change, but the substances involved may change.

Front

Give an example of a physical change.

Back

Examples of physical changes include melting ice, boiling water, and breaking glass.

Front

Give an example of a chemical change.

Back

Examples of chemical changes include iron rusting, wood burning, and baking a cake.

Front

What is rust?

Back

Rust is a compound formed when iron reacts with oxygen and moisture, resulting in iron oxide.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond together, while a mixture is a combination of two or more substances that retain their individual properties.

Front

Is sharpening a pencil a physical or chemical change?

Back

Sharpening a pencil is a physical change because it alters the shape of the pencil without changing its chemical composition.

Front

What is an example of a change that is NOT a physical change?

Back

Rusting of iron is NOT a physical change; it is a chemical change.