Changes in Matter: Physical and Chemical Change

When does a physical change occur?

• when molecules combine to form a compound

• when a new element is created

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

• when elements combine to form new molecules

We use this process to change water from solid to a liquid.

• freezing

• melting

• evaporating

We use this process to change water from liquid to a gas

• melting

• freezing

• evaporation

Which type of change can be reversed?

• a molecular change

• a physical change

• a electric change

• a chemical change

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

• a moderate climate

• pressure

• motion

• extreme heat

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

• a pressurized change has taken changed

• a chemical change has taken place

• a physical change has taken place

• nothing has taken

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 change takes place

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

• the substance has been shaken up

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

• A physical change can only occur in liquids nad a chemical change can only occur in liquids, solid, or a gas

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

• A physical change is new molecules are form.

This is an example of...

• Chemical change

• Mixture

• Physical Change