Review on Chemical & Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, gas production, or precipitate formation.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

Front

Give an example of a chemical change.

Back

Frying an egg, as it involves a change in the chemical structure of the proteins.

Front

Give an example of a physical change.

Back

Ripping paper, as it changes the shape and size but not the chemical composition.

Front

What are some indicators of a chemical change?

Back

Change in color, change in temperature, gas production, formation of a solid (precipitate).

Front

Which of the following is NOT a clue to a chemical change?

Back

Change in shape.

Front

What happens during a chemical change?

Back

Atoms rearrange to form new substances with different properties.

Front

What is rusting an example of?

Back

A chemical change, as iron reacts with oxygen to form iron oxide.

Front

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

Back

Chemical changes result in new substances, while physical changes do not alter the chemical identity of the substance.

Front

What is an example of a physical change involving state?

Back

Melting ice, as it changes from solid to liquid without changing its chemical composition.