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 the rearrangement of atoms. Examples include rusting, burning, and cooking.

Front

Is rusting a chemical or physical change?

Back

Rusting is a chemical change.

Front

Is burning wood a chemical or physical change?

Back

Burning wood is a chemical change.

Front

What happens to the atoms during a chemical change?

Back

During a chemical change, atoms are rearranged to form new substances, but the total number of atoms remains the same.

Front

What are the signs of a chemical change?

Back

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

Front

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

Back

A physical property can be observed without changing the substance's chemical identity (e.g., color, melting point), while a chemical property describes a substance's ability to undergo a chemical change (e.g., flammability, reactivity).

Front

What are atoms?

Back

Atoms are the basic building blocks of matter, consisting of protons, neutrons, and electrons.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is the reaction of vinegar and baking soda to produce carbon dioxide.