States of Matter and Phase Changes

During a phase change (melting, boiling, freezing)

• Temperature changes

• Kinetic Energy Changes

• Thermal Energy is added/removed

• Thermal Energy does not change

What happens to the boiling point of water at higher altitudes?

• It increases.

• It decreases.

• It remains the same.

• It first decreases, then increases.

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Of these three states of matter, which one has the most kinetic energy? 

• Solid 
• Liquid 
• Gas

What happens as a solid reaches the melting point?

• Temperature stops increasing, and energy goes to breaking the attractive forces between particles

• Energy is removed from the solid and decreases the speed of the particles, and temperature will decrease

• it changes from gas to liquid, and particles lose thermal energy

• Thermal Energy goes to into increasing the speed of the particles, and the temperature increases

You are doing a peer review of a science experiment. The paper claims that an increase of pressure requires a greater addition of thermal energy to change a liquid to a gas. Why is this true?

• Because the particles in the gas phase are colliding with the surface of the liquid more frequently and exerting greater forces on the particles in the liquid, which limits the movement of particles from the liquid to gas phase

• Because the particles in the gas phase are colliding with the surface of the liquid less frequently and exerting greater forces on the particles in the liquid, which limits the movement of particles from the liquid to gas phase

• Because the particles in the gas phase are colliding with the surface of the liquid more frequently and exerting less force on the particles in the liquid, which limits the movement of particles from the liquid to gas phase

• Because the particles in the gas phase are colliding with the surface of the liquid less frequently and exerting less force on the particles in the liquid, which limits the movement of particles from the liquid to gas phase

What is the term used to describe the temperature at which a solid turns into a liquid?

• Boiling point

• Freezing point

• Melting point

• Condensation point

The melting point of the sample is

• -60 ºC

• 20 ºC

• 60 ºC

• 100 ºC

Choose the best answer.

Temperature is....

• The amount of thermal energy a substance has

• The average Kinetic Energy (movement) of particles in a substance

• The amount of cold particles a substance has

• The amount of space something takes up

What is the term used to describe the temperature at which a solid turns into a liquid?

• Boiling point

• Freezing point

• Melting point

• Condensation point