Heat being added or taken away from a substance may cause

a change in chemical properties
a change in state
change in the boiling point
change in the freezing point

Question 2 (Multiple Choice Worth 2 points)

“Phase change” and “change of state”

are opposites
sometimes mean the same thing
are unrelated
are two terms for the same thing

Question 3 (Multiple Choice Worth 2 points)

Which of the following statements about freezing points is true?

The boiling point is the same for all substances
The freezing point of a substance is higher than its boiling point
The freezing point of a substance is lower than its boiling point
The freezing point of a substance can be the same as the boiling point

Question 4 (Multiple Choice Worth 2 points)

A liquid may reach its boiling point if

heat is added to it
there are no gases in it
its solid melts easily
the temperature is low enough

Question 5 (Multiple Choice Worth 2 points)

When a liquid becomes a solid, this is called

freezing point
thermal point
boiling point
flash point

Question 6 (Multiple Choice Worth 2 points)

In condensation,

a gas becomes a liquid.
a gas becomes a solid.
a solid becomes a gas.
a liquid becomes a gas.

Question 7 (Essay Worth 3 points)

Explain how changes in temperature affect the particle motion of a substance.