Science Unit 1 Review

Front

What is the law of conservation of mass?

Back

Matter cannot be created or destroyed in a closed system.

Front

Which of the following is not a sign of a chemical change?

Back

Change in shape.

Front

What do freezing and condensing have in common?

Back

They both involve the removal of heat.

Front

What does not affect the rate at which a solid dissolves in liquid?

Back

The color of the liquid.

Front

What is evidence that a new substance is formed when baking soda and vinegar are mixed?

Back

A solid and a liquid are mixed and bubble, which releases a gas.

Front

Define matter.

Back

Anything that has mass and takes up space.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without changing its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is an example of a sign of a chemical change?

Back

Formation of bubbles.

Front

What happens to particles when a substance freezes?

Back

The particles lose energy and move closer together.