Exam 3

Navigation » List of Schools » West Los Angeles College » Chemistry » Chem 051 – Fundamentals of Chemistry » Winter 2021 » Exam 3

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

In which of the following would the particles move most rapidly?

A ice at -20 °C

B ice at 0 °C

C boiling water

D steam at 110 °C

E water at 20 °C

Question #2

A tank contains helium gas at 490 mm Hg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total pressure in atm?

A 1.0 x 103 atm

B 1600 atm

C 1.5 atm

D 0.55 atm

E 2.1 atm

Question #3

Which of the following is a physical change?

A food digests

B ice melts

C natural gas burns

D iron rusts

E sugar caramelizes

Question #4

The energy stored in chemical bonds is

A work.

B a calorie.

C specific heat.

D kinetic energy.

E potential energy.

Question #5

A heating curve illustrates

A what happens to the heat applied as the temperature is increased.

B the changes in the temperature and physical state of a substance as it is heated.

C what a substance looks like as it is heated.

D what happens to the particles of a substance as it is heated.

E the chemical changes that occur as the substance is heated.

Question #6

As a solid melts, its temperature does not change

A FALSE

B TRUE

Question #7

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) Give the answer to 2 significant figures.

A 280 kcal

B 360 kcal

C 70. kcal

D 17 kcal

E 630 kcal

Question #8

How many moles of neon occupy a volume of 14.3 L at STP?

A 1.57 moles

B 36.7 moles

C 32.0 moles

D 0.638 moles

E 6.45 moles

Question #9

What is the concentration, in mass percent (m/m), of a solution prepared from 50.0 g NaCl and 150.0 g of water?

A 0.250%

B 33.3%

C 25.0%

D 3.00%

E 40.0%

Question #10

Condensation occurs when a liquid is converted to a solid.

A FALSE

B TRUE

Question #11

The gas with an initial volume of 24.0 L at a pressure of 565 mmHg is compressed until the volume is 16.0 L. What is the final pressure of the gas, assuming the temperature does not change?

A 760 mmHg

B 377 mmHg

C 848 mmHg

D 500. mmHg

E 465 mmHg

Question #12

A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas pressure when the temperature changes to 450 K?

A 2.1 atm

B 1.1 atm

C 0.47 atm

D 1.5 atm

E 0.94 atm

Question #13

Which of the following is not a characteristic of the solid state?

A particles are in fixed positions

B has a definite shape

C particles are close together

D has a definite volume

E particles are moving very fast

Question #14

At 570. mm Hg and 25 °C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temperature of 175 °C?

A 470 mm Hg

B 1560 mm Hg

C 690 mm Hg

D 210 mm Hg

E 7000 mm Hg

Question #15

A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at STP?

A 30. L

B 5.6 L

C 130 L

D 11 L

E 17 L

Question #16

A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 torr, and a temperature of 25 °C. What was the new volume of the gas when the temperature was changed to 50 °C and the new pressure was 760 torr?

A 970 mL

B 400 mL

C 240 mL

D 530 mL

E 450 mL

Question #17

Black coffee is a homogeneous mixture.

A FALSE

B TRUE

Question #18

The volume of 1 mole of any gas at STP is 22.4 L.

A FALSE

B TRUE

Question #19

3.25 kcal is the same amount of energy as ________.

A 3.25 J

B 13600 J

C 0.777 J

D 13.6 J

E 777 J

Question #20

One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. How many kilocalories, to two significant figures, does this sample contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)

A 88 kcal

B 240 kcal

C 520 kcal

D 60. kcal

E 230 kcal

Question #21

At constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 L to 3.00 L. What was the new pressure exerted by the helium on its container?

A 15.0 torr

B 3800 torr

C 1270 torr

D 800. torr

E 2280 torr

Question #22

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?

A 110. mL

B 0.00950 mL

C 210. mL

D 1170 mL

E 0.00474 mL

Question #23

Rubbing alcohol is 70.% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container?

A 70. mL

B 680 mL

C 470 mL

D 330 mL

E 0.15 mL

Question #24

The pressure exerted by a gas on its container is inversely related to its Kelvin temperature.

A FALSE

B TRUE

Question #25

In a gas, the distance between the particles is

A close relative to the size of the molecules.

B very large relative to the size of the molecules.

C very close relative to the size of the molecules.

D small relative to the size of the molecules.

E fixed relative to the size of the molecules.

Question #26

What temperature scale is used in gas law calculations?

A Celsius

B either Celsius or Fahrenheit

C Kelvin

D either Celsius or Kelvin

E Fahrenheit

Question #27

The energy associated with the motion of particles in a substance is called

A chemical energy.

B temperature.

C heat.

D electrical energy.

E potential energy.

Question #28

At STP, what is the volume of 1.0 mole of carbon dioxide?

A 1.00 L

B 44.0 L

C 12.2 L

D 22.4 L

E 273 L

Question #29

The mass percent concentration refers to

A grams of solvent in 100 g of solution.

B grams of solute in 100 g of solution.

C grams of solute in 100 g of solvent.

D grams of solute in 1 kg of solution.

E grams of solute in 1 kg of solvent.

Question #30

One gram of fat has less energy that one gram of protein.

A FALSE

B TRUE

Question #31

Which measurement describes the pressure of a gas?

A 725 mm Hg

B 1.2 g/L

C 315 K

D 0.45 moles

E 2.5 L

Question #32

According to Avogadro’s law,

A the volume of a gas is inversely related to the number of moles at standard temperature and pressure.

B the volume of a gas is inversely related to the number of moles at constant temperature and pressure.

C the volume of a gas depends only on the temperature and pressure.

D the volume of a gas depends only on the number of moles in the sample.

E the volume of a gas is directly related to the number of moles at constant temperature and pressure.

Question #33

If the heat of vaporization for water is 540 cal/g, how many kilocalories are released when 5.00 g of steam is converted to liquid at 100°C

A 5.0 kcal

B 2.7 kcal

C 5.4 kcal

D 540 kcal

E 110 kcal

Question #34

The specific heat of a substance is the amount of heat needed to

A convert 1 g of a liquid to gas.

B convert 1 g of a solid to a gas.

C raise the temperature of 1 g of the substance by 1 °C.

D change 1 g of the substance from the solid to the liquid state.

E change 1 g of the substance from the liquid to the solid state.

Question #35

The phrase “ability to do work” is a definition of

A heating.

B calorie.

C energy.

D specific heat.

E cooling.

Question #36

The pressure increases as the volume increases, if temperature does not change.

A FALSE

B TRUE

Question #37

The speed of gas molecules is related to the volume of the container.

A FALSE

B TRUE

Question #38

The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as

A sublimation.

B evaporation.

C boiling.

D melting.

E deposition.

Question #39

A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mm Hg?

A 507 mm Hg

B 1.50 mm Hg

C 1140 mm Hg

D 760 mm Hg

E 3800 mm Hg

Question #40

The dietary calorie(Cal) is equal to

A 10 calories.

B 1000 calories.

C 100 calories.

D 1000 kilocalories.

E 1 calorie.

Question #41

Which of the following is a property of a solid?

A The interactions between its particles are very weak.

B It takes the shape of the container.

C It fills the volume of the container.

D The particles have fixed positions and are very close together.

E The particles move at a rapid rate.

Question #42

When a solid is converted directly to a gas, the change of state is called

A freezing.

B melting.

C boiling.

D condensation.

E sublimation.

Question #43

Which of the following is an example of potential energy?

A water stored in a reservoir

B burning wood

C riding an exercise bike

D chewing food

E a fan blade turning

Question #44

The physical state(s) present when a substance is melting is (are)

A solid.

B solid + liquid.

C liquid.

D liquid + gas.

E gas.

Question #45

The force of gas particles against the walls of a container is called

A pressure.

B volume.

C quantity of gas.

D temperature.

E density.

Question #46

Which of the following is an example of a physical change?

A grinding coffee beans

B burning coal

C converting water to hydrogen and oxygen

D digesting a cheeseburger

E baking a cake

Question #47

As heat is removed from a solid, its temperature decreases.

A FALSE

B TRUE

Question #48

STP stands for 0 °C and 760 mm Hg.

A FALSE

B TRUE

Question #49

The pressure of 5.0 L of gas increases from 1.50 atm to 1240 mm Hg. What is the final volume of the gas, assuming constant temperature?

A 0.0060 L

B 5.0 L

C 4100 L

D 5.4 L

E 4.6 L

Question #50

Which one of the following properties describes a liquid?

A particles are close together and move randomly

B has its own shape

C particles move very rapidly

D There is essentially no interaction between the particles.

E fills the entire volume of the container

Question #51

A mixture is prepared by dissolving 2 g of KCl in 100 g of H2O. In this mixture, H2O is the

A solvent.

B ionic compound.

C solute.

D solution.

E solid.

Question #52

How many calories are required to increase the temperature of 13 g of alcohol from 11 °C to 23 °C? The specific heat of alcohol is 0.59 cal/g °C.

A 0.54 cal

B 92 cal

C 83 cal

D 170 cal

E 0.63 cal

Question #53

The unit of 1 atmosphere used to describe the pressure of a gas is equal to

A 1 mm Hg.

B 760 mm Hg.

C 100 mm Hg.

D 200 mm Hg.

E 600 mm Hg.

Question #54

What is the concentration, mass/volume percent (m/v), of a solution prepared from 50. g NaCl and 2.5 L of water?

A 0.050%

B 5.0%

C 20%

D 0.020%

E 2.0%

Question #55

A compound only contains one type of atom.

A TRUE

B FALSE

Question #56

At STP, how many moles of helium would occupy 1.00 L?

A 22.4 moles

B 224 moles

C 2.24 moles

D 0.446 moles

E 0.0446 moles

Question #57

Coins in a piggy bank are an example of a(n)

A homogeneous mixture.

B element.

C heterogeneous mixture.

D compound.

E none of the above

Question #58

Raising the temperature of 10.0 g of water from 10.0 °C to 20.0 °C requires 100.0 cal of energy, while raising the temperature of 10.0 g of aluminum from 10.0 °C to 20.0 °C requires 22.0 cal. More calories are required to heat the water because

A water is a liquid and aluminum is a solid at 10.0 °C.

B water has a greater potential energy than aluminum.

C 10.0 °C is closer to the melting point of water than to the melting point of aluminum.

D ten grams of water occupies a larger volume than 10.0 g of aluminum.

E water has a larger specific heat than aluminum.

Question #59

Which of the following does not represent a step on the heating curve of water?

A The temperature of steam cannot exceed 100 °C.

B The temperature of liquid water increases linearly as it is heated.

C The temperature of liquid water remains at 100 °C as it boils.

D The temperature of ice remains at 0 °C as it melts.

E Both liquid water and ice are present at 0 °C.

Question #60

A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 mm Hg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr?

A 1.4 torr

B 330 torr

C 760 torr

D 430 torr

E 1100 torr

Question #61

On a heating curve a plateau corresponds to

A a change in temperature of a solid.

B a change in temperature of a gas.

C the solid being broken into smaller pieces.

D a change in temperature of a liquid.

E a change of state.

Question #62

At STP conditions, 11 g of SO2 have a volume of

A 250 L.

B 22 L.

C 0.0076 L.

D 3.8 L.

E 130 L.

Question #63

Which of the following is a physical change?

A dry ice subliming

B a tomato ripening

C fermenting grapes to produce wine

D baking a cake

E digesting a meal

Question #64

How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 °C to 35 °C? Iron has a specific heat of 0.108 cal/g °C.

A 93 cal

B 1.1 cal

C 130 cal

D 38 cal

E 3.8 cal

Question #65

Carbohydrates and proteins have the same caloric value per gram.

A FALSE

B TRUE

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment