AnswersIA-Chemistry A Survey of Chemistry AUnit Test

Unit Test — Unit test Answers

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Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine particles?

A
It decreases rapidly.
B
It increases quickly.
C
It remains the same.
D
It decreases slowly.
2
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Which device involves the use of plasma in technology?

A
arc welder
B
diesel engine
C
a car radio
D
battery-operated flashlight
3

Which change of state involves a release of energy?

A
boiling
B
condensation
C
melting
D
sublimation
4

Which of the following best identifies where long-range order would be found?

A
in amorphous solids
B
in crystalline solids
C
in thermal plasmas
D
in nonthermal plasmas
5

Which statement describes an intensive property of matter?

A
It is the same for every sample of a single substance.
B
It depends on how a substance was formed.
C
It is the same for every sample of every substance.
D
It depends on the amount of substance present.
6

The diagram below shows the different phase transitions that occur in matter. Which arrow represents the transition in which dew is formed?

Question illustration
A
1
B
2
C
4
D
6
7

According to the kinetic-molecular theory, the average kinetic energy of gas particles depends on which factor?

A
volume
B
pressure
C
temperature
D
number of particles
8

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
density of the copper strip
B
reactivity of the copper strip
C
odor of the chlorine solution
D
color of the chlorine solution
9

Which statement best explains why heating a liquid affects its viscosity?

A
The molecules move faster at higher temperatures and overcome attractions more easily.
B
The molecules move faster at higher temperatures, and the attractions between them increase.
C
The molecules move slower at higher temperatures and overcome attractions more easily.
D
The molecules move slower at higher temperatures, and the attractions between them decrease.
10

Water’s molar mass is 18.01 g/mol. The molar mass of glycerol is 92.09 g/mol. At 25°C, glycerol is more viscous than water. Which substance has the stronger intermolecular attraction?

A
glycerol because it has a larger molar mass
B
glycerol because it is more viscous and has a larger molar mass
C
water because it has a lower molar mass
D
water because it is less viscous and has a lower molar mass
11

This heating curve is produced when a certain substance is heated.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?

Question illustration
A
The particles are slower in region 3.
B
The particles are more orderly in region 1.
C
The particles have more kinetic energy in region 1.
D
The particles have less freedom of motion in region 3.
12

Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop of dishwashing detergent is added near it?

A
Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
B
Soap makes the water less viscous making the paperclip sink.
C
Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.
D
Soap makes the water more viscous allowing the paperclip to continue to float.
13

Which is the best example of immiscible liquids?

A
two polar liquids that have high surface tensions
B
a polar liquid and a nonpolar liquid that have low surface tensions
C
two nonpolar liquids that can dissolve into one another
D
a polar liquid and a nonpolar liquid that do not dissolve into one another
14

A perfume bottle is dropped in the corner of a room and it shattered. The odor of the perfume can be detected on the other side of the room. Which statement best describes this observation?

A
Particles are moving from regions of high concentration to low concentration.
B
Particles are moving from regions of low concentration to high concentration.
C
Particles are moving through a small opening into a smaller volume.
D
Particles are moving through a small opening into a larger volume.
15

Which is an aspect of the kinetic-molecular theory and can be used to explain the behavior of plasmas?

A
Particle spacing can allow a very high density.
B
Particle kinetic energy is independent of temperature.
C
Particles vibrate quickly in stationary positions.
D
Particles exchange energy through elastic collisions.
16

Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

Question illustration
A
The temperature is always lower.
B
The temperature is always the same.
C
The temperature is usually lower.
D
The temperature is usually higher.
17

The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions with the wall of the balloon. What is the most likely outcome?

A
higher gas pressure inside the balloon
B
higher air pressure outside the balloon
C
a decrease in gas temperature inside the balloon
D
a large increase in air temperature outside the balloon
18

A substance is tested in a lab. It is found to maintain a unique shape and is a good conductor of electricity. If it is made up of electrons, protons, and neutrons, what state of matter is this substance most likely to be?

A
gas
B
liquid
C
plasma
D
solid
19

Which process is a chemical change?

A
burning a match
B
boiling water
C
melting ice
D
breaking glass
20

Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?

A
gas
B
liquid
C
plasma
D
solid

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