AnswersChemistryStates and Changes of Matter

States and Changes of Matter — Test Answers

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A student is using a copper strip and a strong chlorine solution in her experiment. Which of these is a chemical property of one of her materials?

A
reactivity of the copper strip
B
color of the chlorine solution
C
odor of the chlorine solution
D
density of the copper strip
22
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Considering the temperature vs. time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

A
The temperature is usually higher.
B
The temperature is usually lower.
C
The temperature is always lower.
D
The temperature is always the same.
23

Which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3?

A
The particles are slower in region 3.
B
The particles have less freedom of motion in region 3.
C
The particles have more kinetic energy in region 1.
D
The particles are more orderly in region 1.
24

Which event is most likely occurring?

A
effusion because there is a movement of a gas through a small opening into a larger volume
B
diffusion because particles move from regions of high concentration to regions of low concentration
C
effusion because there is a movement of a gas through a large opening into a smaller volume
D
diffusion because particles move from regions of low concentration to regions of high concentration
25

If both gases are at the same temperature, which one has the greater pressure?

A
gas 1 because the particles are moving much faster
B
gas 2 because the particles have more space between them
C
gas 1 because it has fewer particles that are close together
D
gas 2 because it has more particles that are colliding

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