Changes of Matter

When does a physical change occur?

• when molecules combine to form a compound

• when a new element is created

• when the size, shape, or state of matter changes

• when elements combine to form a molecule

Which type of change can be reversed?

• physical change

• chemical change

• molecular change

• electric change

Which of the following would cause the molecules in matter to change?

• a moderate climate

• pressure

• extreme heat

• motion

If a substance changes color, what has most likely happened?

• a pressurized change has taken place

• a chemical change has taken place

• a physical change has taken place

• nothing has taken place

Stepping on a bag of potato chips would cause which type of change?

• mechanical

• thermal

• physical

• chemical

Which of the following is a clue that a chemical change has taken place?

• a gas forms when the change takes place

• the substance is smaller than it was before the change took place

• the substance has been shaken up

• the substance looks the same as it did before the change took place

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

• a physical change can only occur in liquids, and a chemical change can occur in a solid, a liquid, or a gas

• a physical change is when the size, shape, or state of matter changes, and a chemical change is when molecules of matter change to form a new substance

• a physical change is when the molecules of matter change to form a new substance, and a chemical change is when the size, shape, or state of matter changes

• a physical change can occur in a solid, a liquid, or a gas, and a chemical change can only occur in a liquid