Matter Topic 1 Unit Test

Last name ONLY

What is the Law of Conservation of Mass?

• Matter can only be destroyed in physical changes, but not created
• Matter can only be created in chemical changes, but not destroyed
• Matter can be created or destroyed in any chemical or physical change
• Matter is not created or destroyed in any chemical or physical change

What is thermal energy?

• The energy required to change the temperature of an object
• The total energy of the motion of all particles in an object
• The energy required to change the state of matter
• The energy released during a chemical change

Which of the following statements best describes energy conservation in chemical changes?

• Energy is not involved in chemical changes
• Energy is transformed in chemical changes
• Energy is destroyed in chemical changes
• Energy is created in chemical changes

Which of the following is an example of a physical change?

• Photosynthesis
• Melting
• Burning
• Digesting

Which of the following is an example of an element?

• H2CO3
• NaNO3
• Na2B4O
• C

What role do molecules play in PHYSICAL changes?

• They rearrange to form new substances
• They are destroyed
• They remain unchanged
• They are created

What role do molecules play in CHEMICAL changes?

• They rearrange to form new substances
• They are destroyed
• They remain unchanged
• They are created

Can physical changes be reversed?

• No, never
• It depends on the substance
• Always
• Most of the time

The air we breathe is a ________.

• Pure substance
• Heterogeneous Mixture
• Homogeneous Mixture
• Element