Phase Change Questions (for a grade)

A substance's heating curve is shown in the graph.  What is its boiling point?

• 100 C
• 60 C
• 80 C
• 20 C

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

What state/phase is the object likely from points A to B?

• Solid

• Liquid

• Gas

• Plasma

What is happening to the particles in the substance between points D and E?

• Melting

• Freezing

• Vaporizing

• Sublimating

What is happening to the particles in the substance between points A and B?

• Melting

• Freezing

• Speeding Up

• Slowing Down

Where on the graph are phase changes taking place?

• 1

• 2

• 3

• 4

• 5

5. What is it called when a solid turns directly into a gas?

• Sublimation
• Condensation
• Liquid

What happens to particles when they are heated?

• They speed up and spread out
• They slow down and compress
• They stop moving
• They move closer together and speed up

All changes in the state of matter of a substance requires

• vibration
• water
• permission
• energy

If a substance is freezing, what is happening to it?

• It is changing from a liquid to a solid

• It is losing thermal energy to its surroundings

• the particles of the substance are making bonds

• all of the above