Chemical and 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.

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

Shattering a glass bottle is an example of a physical change.

Front

Give an example of a chemical change.

Back

The color change of a copper roof due to oxidation is an example of a chemical change.

Front

What happens to the mass of matter when salt is dissolved in water?

Back

The total mass remains the same; for example, mixing 1 gram of salt with 50 grams of water results in 51 grams of matter.

Front

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

Back

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

Front

What is an example of a physical change involving water?

Back

Boiling water is an example of a physical change, as it changes the state of water from liquid to gas without altering its chemical composition.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

What is an example of a physical change involving paper?

Back

Shredding a piece of paper is an example of a physical change, as the paper's composition remains the same.

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.