Physical Changes
Chemical Changes
Conservation of Matter
Examples
100

What is a physical change?

A change in appearance or state that does not form a new substance.

100
What is a chemical change?

A change where a new substance is formed.

100

What is the law of conservation of matter?

Matter cannot be created or destroyed.

100

Is folding paper a chemical or physical change?

Physical

200

Give an example of a physical change.

Ice melting into water.

200

What evidence suggests a chemical change?

Gas release, energy release, or a formation of a new substance.

200

Why does the weight of an orange stay constant after it's peeled?

The mass remains the same because no matter is lost.

200

What type of change occurs when metal rusts?

Chemical

300

Does the mass of matter change during a physical change?

No, the mass stays the same.

300

What happens when wood burns?

A chemical reaction forms new substances.

300

There is a chemical reaction happening inside of a sealed balloon. Would the mass stay the same after the chemical reaction?

Yes, the mass of the matter stays the same even if the matter changes form.

300

Is boiling water a chemical or physical change?

Physical

400

Describe the state of this matter after mixed: red and blue beads mixed in a bowl.

The beads mix, but their properties do not change. It is a mixture.

400

Why can't you separate chemicals in a glow stick after they are mixed?

A chemical change forms a new substance.

400

When water boils, why does the mass stay the same if the vapor is collected?

The water converts into vapor, but the total mass does not change.

400

What happens when you mix baking soda and vinegar?

A chemical change releases gas and forms new substances.

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