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.

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Describe the process of deposition and give an example.

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

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Why do phase change occur?

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

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