Unit 2 Science Test

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, such as rusting or burning.

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, such as melting or freezing.

Front

What happens to the weight of matter during a chemical change?

Back

The weight of matter remains the same before and after a chemical change, according to the law of conservation of mass.

Front

What is an example of a gas?

Back

An example of a gas is air, which does not have a definite shape or volume.

Front

How can you demonstrate that air takes up space?

Back

You can blow up a balloon, tie it closed, and then try to flatten it to show that air occupies space.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What happens to ice when it melts?

Back

When ice melts, it changes from a solid to a liquid, but the total mass remains the same.

Front

What is the definition of a liquid?

Back

A liquid is a state of matter that has a definite volume but takes the shape of its container.

Front

What is the definition of a solid?

Back

A solid is a state of matter that has a definite shape and volume.