AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Unit test Answers

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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.
2
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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
3

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.
4

If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what would happen to the pressure of the gas?

A
It would increase.
B
It would be halved.
C
It would stay the same.
D
It would slightly decrease.
5

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.
6

Which describes the volume of 1 mol of gas at standard temperature and pressure?

A
The volume is greater for a larger mass of gas.
B
The volume is the same for any gas.
C
The volume depends on the size of the container.
D
The volume varies with the pressure.
7

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
8

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
9

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
10

Which statement can best be concluded from the ideal gas law?

A
The product of pressure and volume of an ideal gas is proportional to the absolute temperature.
B
All collisions between atoms or molecules are perfectly elastic and are not the result of any attractive forces.
C
The temperature, pressure, and volume of a gas are all related.
D
The behavior of a gas under real conditions does not obey the ideal gas law.
11

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?

A
the molar amount of the gas
B
the partial pressure of the gas
C
the standard temperature and pressure
D
the molar mass
12

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
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

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.
15

Which change of state involves a release of energy?

A
boiling
B
condensation
C
melting
D
sublimation
16

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.
17

The diagram below shows the different phase transitions that occur in matter. Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?

Question illustration
A
2
B
3
C
4
D
5
18

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
19

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.
20

A plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as a

A
thermal plasma.
B
ionized plasma.
C
low density plasma.
D
nonthermal plasma.

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