Changes in matter review

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 cooking.

Front

Is melting ice a physical or chemical change?

Back

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

Front

What happens during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What is an example of a chemical change?

Back

An example of a chemical change is vinegar reacting with baking soda to produce carbon dioxide gas.

Front

What is an example of a physical change?

Back

An example of a physical change is tearing a piece of paper.

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 the formation of new substances.

Front

What is tarnishing?

Back

Tarnishing is a chemical change that occurs when metals react with sulfur or oxygen in the air, resulting in a dull coating.

Front

What happens when sugar dissolves in water?

Back

When sugar dissolves in water, it undergoes a physical change because it breaks into smaller pieces but does not form a new substance.

Front

What is fizzing and bubbling an indication of?

Back

Fizzing and bubbling are indications of a chemical change, often due to the release of gas.