AnswersLA-Chemistry AUnit Test

Unit Test — Unit test Answers

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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.
2
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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.
3

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
4

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
5

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
6

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.
7

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
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 change of state involves a release of energy?

A
boiling
B
condensation
C
melting
D
sublimation
10

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.
11

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.
12

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
13

Which device involves the use of plasma in technology?

A
arc welder
B
diesel engine
C
a car radio
D
battery-operated flashlight
14

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.
15

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.
16

Which process is a chemical change?

A
burning a match
B
boiling water
C
melting ice
D
breaking glass
17

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
18

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.
19

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
20

Which observation indicates that the kinetic-molecular theory has limited use for describing a certain gas?

A
Gas particles are acting like tiny, solid spheres.
B
Gas particles are obeying Newton’s laws of motion.
C
Increasing pressure is reducing the volume of the gas.
D
Increasing collisions of gas molecules will increase energy between them.

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