AnswersCHS Chemistry APhase Changes

Phase Changes Answers

0 verified answers1 views
1
Free Preview

Which best explains the relationship between evaporation and temperature?

A
A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid’s surface.
B
A liquid evaporates faster at lower temperatures because the attractions are decreased and more particles can escape the surface of the liquid.
C
A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, so fewer molecules can escape the surface.
D
A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
2
Free Preview

Consider the statement below.“When nitrogen is liquefied, heat is released.”Is this statement true or false?

A
It is false because nitrogen absorbs heat when it is liquefied.
B
It is false because nitrogen cannot absorb enough heat to liquefy.
C
It is true because heat is released when a gas changes to a liquid.
D
It is true because heat is released when a liquid changes to a gas.
3

Consider the temperature versus time graph below.In which region is the substance in both the solid phase and the liquid phase?

Question illustration
A
1
B
2
C
3
D
4
4

The arrows in the chart below represent phase transitions.Which arrows represent the phase transitions in which heat energy is gained?

Question illustration
A
1, 2, and 3
B
2, 3, and 5
C
3, 4, and 5
D
4, 5, and 6
5

The diagram below shows the different phase transitions that occur in matter.Which statement best describes the process that arrow 1 represents?

Question illustration
A
Molecules are speeding up as boiling occurs.
B
Molecules are slowing to a stop while freezing.
C
Molecules are slowing down during condensation.
D
Molecules are vibrating in stationary positions.
6

Jean has a sample of a liquid. If she changes the liquid’s phase by

A
evaporating
B
freezing
C
condensing
D
melting
7

The diagram below shows the different phase transitions that occur in matter. Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?

Question illustration
A
1
B
3
C
4
D
5
8

Which energy change occurs during boiling?

A
Some heat energy of the substance is lost.
B
Heat energy of the substance remains the same.
C
Most heat energy of the substance is lost.
D
Heat energy is absorbed by the substance.
9

Which example involves a phase change in which heat energy is released by the substance?

A
freezing ice cream
B
cooking a pot of soup
C
melting ice under sunlight
D
watching frost disappear into air
10

is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?

Question illustration
A
from a gas to a liquid
B
from a liquid to a gas
C
from a solid to a liquid
D
from a gas to a plasma

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Phase Changes

Quiz
10 verified answers

Phase Changes

Quiz
10 verified answers

Phase Changes

Phase Changes Answers — CHS Chemistry A