Changes in States of Matter

Evaluate the following statements.
Statement 1: Change of state of matter are reversible changes.

Statement 2: Change of state is a chemical change in matter.

• Both statements are true.

• Statement 1 is true, while statement 2 is false.

• Statement 1 is false, while statement 2 is true.

• Both statements are false.

What happens to the molecules of a substance when it melts?

• They move faster and come closer together.

• They move faster and spread apart.

• They slow down and spread apart.

• They slow down and come closer together.

The process when heat is added to liquid and it converts to gas is called?

• Condensation

• Melting

• Evaporation

• Deposition

Which process describes a solid turning directly into a gas, without passing intermediate liquid phase?

• Melting

• Sublimation

• Condensation

• Deposition

What happens to the molecules of a substance when it freezes?

• They move faster and spread apart.

• They slow down and spread apart.

• They move faster and come closer together.
  

• They slow down and come closer together.

Name at least 3 different changes in state of matter.

Describe the process of deposition and give an example.

The process in which a solid turns into a liquid is called freezing.
Is the statement true or false? Justify your answer.

Why do phase change occur?

Why does sweating help cool your body? What type of phase change occurs when we sweat?