Lesson 15

Question 1

Can molecules go from a solid state to a gaseous state?

Answer 1

Yes- some molecules move fast enough going right to the gaseous state

Question 2

Deposition

Answer 2

Gas changing to a solid state, skipping the liquid phase

This is the opposite of sublimation!

Question 3

What is melting point?

Answer 3

The point where a solid begins to turn into a liquid

Question 4

Sublimation

Answer 4

When a substance changes from solid to gas, skipping the liquid phase

Question 5

Condensation

Answer 5

When a substance changes from gaseous state to liquid state

Think dew on grass in the morning.

Question 6

What is boiling point?

Answer 6

The point where a liquid turns to a gas

Question 7

True/False

The melting point of a substance does not change when the amount of the substance changes

Answer 7

True-Look at it this way, if you have a chocolate kiss and add five more the melting point will still be the same.

Question 8

Molecules in liquids and gases

Answer 8

Have no fixed positions and move randomly.

Question 9

Molecules in solids

Answer 9

Vibrate in place

Question 10

True/False

When water vapor molecules speed up, they can change from gas and turn solid

Answer 10

False