Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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

Give an example of a chemical change.

Back

Baking a cake is an example of a chemical change because new substances are formed during the baking process.

Front

Give an example of a physical change.

Back

An ice cube melting is an example of a physical change because it changes from solid to liquid but remains water.

Front

What happens during rusting?

Back

Rusting is a chemical change where iron reacts with oxygen and moisture to form rust, a new substance.

Front

Is freezing water a chemical or physical change?

Back

Freezing water is a physical change because it changes from liquid to solid without forming a new substance.

Front

What is an indicator of a chemical change?

Back

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

Front

What is an example of a new substance being formed?

Back

A nail rusting is an example of a new substance being formed as iron reacts with oxygen.

Front

Which of the following is NOT a physical change: crumpling paper, pencil sharpening, shrunken clothing, or sour milk?

Back

Sour milk is NOT a physical change; it is a chemical change due to the spoilage of milk.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not change the substance's chemical identity.