AnswersBCHS KY-Chemistry Section AUnit Test

Liquids Answers

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The table describes a gas stored in four different containers. Properties of Stored GasContainerProperties1· Low number of collisions with container walls· Medium average kinetic energy· Large number of particles2· Large number of collisions with container walls· Medium average kinetic energy· Small number of particles with little spaces between them3· Large number of collisions with container walls· High average kinetic energy· Large number of particles with large spaces between them4· Few collisions with container walls· Low average kinetic energy· Small number of particlesWhich container has gas stored at the highest temperature?

A
1
B
2
C
3
D
4
2
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Which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior?

A
high pressure and low temperatures
B
high pressure and medium temperatures
C
low pressure and low temperatures
D
low pressure and medium temperatures
3

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.
4

Which is an example of the kinetic-molecular theory not holding true for a gas?

A
The average kinetic energy of particles depends only on the temperature.
B
The particles in a gas travel in straight lines in a continuous, random motion.
C
The attraction between particles causes a gas to condense at low temperatures.
D
The particles in a gas make up a small portion of the total volume of the gas.
5

Which statement about gases is true?

A
They are made up of particles that always move very slowly.
B
They are made up of particles that travel in a curved path when in motion.
C
They are made up of hard spheres that vibrate quickly in stationary positions.
D
They are made up of hard spheres that are in random motion.
6

Which statement describes effusion?

A
It occurs when a gas passes through a tiny hole.
B
It occurs when a liquid passes through a tiny hole.
C
It occurs when gas molecules disperse throughout a container.
D
It occurs when a liquid disperses throughout a container.
7

A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph?

A
volume versus pressure, because they are also directly proportional
B
volume versus temperature, because they are also directly proportional
C
volume versus pressure, because they are also inversely proportional
D
volume versus temperature, because they are also inversely proportional
8

The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressures and temperatures. Which best describes this statement?

A
This is a limitation of the kinetic-molecular theory.
B
This is a postulate of the kinetic-molecular theory.
C
This describes ideal gas behavior using the kinetic-molecular theory.
D
This describes ideal gas behavior without the kinetic-molecular theory.
9

According to the kinetic-molecular theory, the collision between two ideal gas particles is a result of

A
neither attraction nor repulsion.
B
repulsion from the wall of the container.
C
repulsion from other gas particles.
D
attraction between the two particles.
10

Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?

A
higher temperature more kinetic energy more space between particles higher volume
Option A
B
higher temperature less kinetic energy less space between particles higher volume
Option B
C
higher temperature more kinetic energy less space between particles lower volume
Option C
D
higher temperature less kinetic energy more space between particles lower volume
Option D
11

What is produced on the top of a pool of water by the mutual attraction between water molecules?

A
surfactant
B
surface tension
C
a much smaller volume
D
a much higher density
12

Why are liquids well suited for hydraulics?

A
Liquids have low densities.
B
Liquids are incompressible.
C
Liquids change volume easily.
D
Liquids have few molecules.
13

What happens when a solid is dissolved into a liquid?

A
Solid particles float toward the surface layer of liquid particles.
B
Solid particles sink down toward the bottom layer of liquid particles.
C
Solid particles become evenly dispersed among liquid particles.
D
Solid particles become suspended in the middle of liquid particles.
14

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
15

The particles in water have less mobility than the particles in oxygen. Which statement best explains this observation?

A
Water is always colder than oxygen.
B
Water has a lower density than oxygen.
C
Water particles have a greater kinetic energy.
D
Water particles have strong intermolecular forces.
16

Which postulate of the kinetic-molecular theory applies to the particles of a liquid?

A
They do not move freely but vibrate in a stationary position.
B
They can be compressed, which causes a large change in volume.
C
They have so much kinetic energy that their intermolecular forces are negligible.
D
They have enough kinetic energy to easily slide by each other.
17

What happens as a result of the kinetic energy of the particles in a liquid being comparable with the intermolecular attractions between the particles?

A
The particles do not move enough to change positions, so the liquid is not compressible.
B
The particles move enough that they separate from one another and take the shape of their container.
C
The particles do not move enough, so they are fixed in place, and the liquid has a fixed volume.
D
The particles move enough that they are not fixed in place, and the liquid can flow.
18

Which term best describes the substances that cause oil and water molecules in salad dressing to interact and mix?

A
surfactants
B
miscible liquids
C
immiscible liquids
D
compressed molecules
19

Which molecular characteristics would most likely cause a liquid to have the lowest viscosity?

A
Large molecules with strong intermolecular attractions
B
Small molecules with weak intermolecular attractions
C
Small molecules with strong intermolecular attractions
D
Large molecules with weak intermolecular attractions
20

Which process most likely takes place when the kinetic energy of molecules overcomes the intermolecular forces?

A
boiling
B
condensation
C
freezing
D
solidification

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