Phase Changes — Unit test Answers

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If gas particles start colliding with the walls of their metallic container with increased force, what is their direct effect?

A
lower gas pressure
B
higher gas pressure
C
lower volume of gas
D
higher volume of gas
22
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How does the motion of particles in the sun’s plasma compare to the motion of particles in a solid?

A
Particles in both the plasma and a solid move around to fill available space.
B
Particles in the plasma move randomly, but particles in a solid vibrate in one place.
C
Particles in the plasma have low kinetic energy, but particles in a solid have high kinetic energy.
D
Particles in both the plasma and a solid are made up of fast-moving electrons and cations.
23

Glycerol boils at a higher temperature than water. What does this indicate about the attractive forces of glycerol?

A
They are nonexistent.
B
They are the same as those in water.
C
They are stronger than those in water.
D
They are weaker than those in water.
24

Valerie wants to examine the properties of a thick liquid but is finding it difficult to pour the liquid into a beaker. She needs to finish her investigation before the end of class. Which method will allow her to pour the liquid easily?

A
boiling the liquid vigorously
B
applying heat to the liquid
C
placing the liquid in the refrigerator
D
mixing the liquid with another solution
25

The diagram shows the movement of particles from one end of the container to the opposite end of the container.Which event is most likely occurring?

Question illustration
A
diffusion because particles move from regions of high concentration to regions of low concentration
B
diffusion because particles move from regions of low concentration to regions of high concentration
C
effusion because there is a movement of a gas through a small opening into a larger volume
D
effusion because there is a movement of a gas through a large opening into a smaller volume

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Phase Changes — Unit test Answers — IA-Chemistry…