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.