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 changes in state, shape, or size.

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 breaking and forming of bonds.

Front

Give an example of a physical change.

Back

An example of a physical change is a pellet of sodium being sliced in two.

Front

Give an example of a chemical change.

Back

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

Front

What happens during rusting?

Back

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

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 change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change that involves breaking?

Back

An example of a physical change that involves breaking is a glass breaking.

Front

What is produced when hydrochloric acid reacts with potassium hydroxide?

Back

When hydrochloric acid reacts with potassium hydroxide, it produces a salt, water, and heat, indicating a chemical change.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.