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Unit 8 Review

Total questions: 92

Worksheet time: 2hrs 49mins

Name
Class
Date
1.
In an exothermic process the surrounding looses heat. 
a)
True
b)
False
2.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
3.

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.

a)

Warm

b)

Cold

c)

Bubbly

d)

Damp

4.
H2 + Cl2 --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
5.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
6.
The transfer of thermal energy between objects of different temperatures is called...
a)
temperature
b)
heat
c)
internal energy
d)
none of these
7.

This potential energy diagram (graph) represents an _________ change.

a)

endothermic

b)

exothermic

8.

A change in enthalpy, ΔH, for a reaction is described as energy absorbed or released as  ________.

a)

light.

b)

heat.

c)

sound.

d)

pressure.

9.
Heat is measured in 
a)
joules
b)
grams
c)
degrees celcius
10.

A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.

a)

endothermic; positive

b)

endothermic; negative

c)

exothermic; negative

d)

exothermic; positive

11.

During an exothermic reaction, heat content in the surroundings increases because

a)

heat energy is destroyed during reactions

b)

the reaction absorbs heat energy

c)

the energy contained in the reactants is lower then the products

d)

the energy contained in the products is lower than the reactants

12.

The graph represents the uniform heating of a substance, starting with the substance as a solid below its melting point. Which line segment listed below represents an increase in potential energy and no change in average kinetic energy?

a)

Line segment AB

b)

Line segment BC

c)

Line segment CD

d)

Line segment EF

13.
Exothermic reactions are reactions that
a)
release heat
b)
do not involve heat
c)
absorb heat
d)
take place instantaneously
14.
Which of the following is an endothermic process?
a)
solid to gas
b)
liquid to solid
c)
solid to liquid
d)
gas to liquid
15.
What does temperature measure?
a)
Heat
b)
ºC
c)
Kinetic Energy
d)
Thermal Energy
16.

Calculate ΔT\Delta T  when a substance goes from 10*C to 75*C

a)

-65*C

b)

75*C

c)

10*C

d)

65*C

17.

Calculate A 50g sample is heated with 500 joules of energy and has a 10*C temperature change. Calculate it’s specific heat.

a)

1 j/g*C

b)

250000 j/g*C

c)

500 j/g*C

d)

10 j/g*C

18.

4180 j of heat energy are added to change the temperature of water by 10*C. How many grams of water are being heated? cwater=4.18 j/g*C

a)

4.18 j/g*C

b)

10000g

c)

174724g

d)

100g

19.

What heat energy is required to raise the temperature of a 1g sample of mercury (cHg=.16 j/g*C) by 100*C?

a)

16j

b)

.0016j

c)

16000j

d)

625 j

20.

What type of reaction is this?

a)

Endothermic

b)

Exothermic

c)

Allergic

21.

What type of reaction is this?

a)

Endothermic

b)

Exothermic

c)

Allergic

22.

What does q stand for?

a)

Heat-Joules

b)

Mass-Grams

c)

Specific Heat-J/g*C

d)

Temperature Change-*C

23.

What does c stand for?

a)

Heat-Joules

b)

Mass-Grams

c)

Specific Heat-J/g*C

d)

Temperature Change-*C

24.

What does ΔT\Delta T   stand for?

a)

Heat-Joules

b)

Mass-Grams

c)

Specific Heat-J/g*C

d)

Temperature Change-*C

25.

What does m stand for?

a)

Heat-Joules

b)

Mass-Grams

c)

Specific Heat-J/g*C

d)

Temperature Change-*C

26.

Ice cream melting is an example of an __________ process.

a)

endothermic

b)

exothermic

27.

Sweating is an __________________ process because heat is released.

a)

endothermic

b)

exothermic

28.

Mass must always be in ________ for energy calculations.

a)

kilograms

b)

grams

c)

joules

d)

calories

29.

What device is used to measure the amount of heat involved in a chemical reaction or physical process?

a)

barometer

b)

calorimeter

c)

thermometer

30.

A student measures the pressure and volume of an empty water bottle to be 1.4 atm and 2.3 L. She then decreases the pressure to 0.65 atm. What is the new volume?

a)

2.1 L

b)

5.0 L

c)

8.2 L

d)

3.9 L

31.

A student inflates a balloon with helium then places it in the freezer. The student should expect

a)

the balloon's volume to increase

b)

the balloon's volume to decrease

c)

the balloon's moles to increase

d)

the balloon's moles to decrease

32.

What is the pressure of a car tire that had an initial pressure of 1.8 atm but was heated from 38°C to 123°C?

a)

0.9 atm

b)

2.1 atm

c)

1.6 atm

d)

3.4 atm

33.

Three gases are mixed together in a container with a total pressure of 4.8 atm. If two of the gases have pressures of 1.2 atm and 1.5 atm, what is the pressure of the third gas?

a)

2.5 atm

b)

1.8 atm

c)

2.1 atm

d)

1.3 atm

34.

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

a)

The pressure will increase

b)

The pressure will decrease

c)

The pressure will remain constant

d)

The pressure will equalize

35.
Which of the following would increase the (gas) pressure of a system?
a)
Increase the Temperature
b)
Pump in more gas
c)
Decrease the volume
d)
All of these
36.
In order to convert to Kelvin, you add ______ to the Celsius measurement.
a)
372
b)
273
c)
237
d)
732
37.
What about gases can be measured?
a)
Pressure and Volume
b)
Temperature, Volume, and Pressure
c)
Volume and Temperature
d)
Pressure, Temperature, Volume, and Moles
38.
What is 50 °C in Kelvin?
a)
223
b)
323
c)
100
d)
50
39.
Charles' Law States...
a)
As Pressure goes up volume goes down
b)
As Pressure goes up temperature goes up
c)
As Volume goes up temperature goes up 
d)
As Pressure goes down volume goes down 
40.
Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.
a)
7.18 L 
b)
7.81 L
c)
4.63 L
d)
4.36 L
41.

Determine the temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure.

a)

0 K

b)

107 K

c)

207 K

d)

307 K

42.

Pressure is

a)

defined as the mass that an object exerts when at rest.

b)

not a measurable in gases.

c)

defined as the number of moles of substance divided by the mass of the substance.

d)

created by the force of the gas particles impacting the walls of the container.

43.

A sample of gas with a volume of 30.0 mL at 25.0oC is heated to 50.0oC. What is the new volume of the gas?

a)

60.0 mL

b)

15.0 mL

c)

27.5 mL

d)

32.5 mL

44.

What is the pressure exerted by 5.00 moles of nitrogen gas contained in a 30.0 Liter container at 25.0 °C?

a)

3670 atm

b)

0.245 atm

c)

4.08 atm

d)

605 atm

45.

What is the Standard for Temperature and Pressure?

a)

273 K and 1 atm

b)

273 C and 1 kPa

c)

273 F and 1 mmHg

d)

273 K and 1 Torr

46.

The pressure on a tank containing 0.3 moles of oxygen is 4.5 atm, and the temperature is 150 K. What is the volume of the gas?

(R = 0.0821)

a)

0.821 L

b)

8.21 L

c)

82.1 L

d)

821 L

47.

If you have 40 L of a gas at 6 atm, and 275K, how many moles will you have?

(R = 0.0821)

a)

10.6 mol

b)

0.1 mol

c)

150.5 mol

d)

81.2

48.

A sealed container holds a mixture of Neon and Helium. The Neon has a Pressure of 2.25 atm. If the total Pressure in the container is 7 atm, what is the Partial Pressure of Helium?

a)

4.75 atm

b)

9.25 atm

c)

3.11 atm

d)

15.75 atm

49.

What does the unit Liters, L, measure?

a)

Volume

b)

Pressure

c)

Temperature

d)

Moles

50.

8 L of Helium gas are stored under a pressure of 3.3 atm. If there are 9.4 moles of Helium, what is the temperature of this sample of gas?

(R = 0.0821)

a)

34.2 K

b)

100 K

c)

273 K

d)

20.4 K

51.

Gas particles are in constant motion. They travel in straight lines, and they constantly bounce off the walls of any container that holds them.

What does this constant bombardment of particles against the walls of the container create?

a)

Pressure

b)

Density

c)

Temperature

d)

Magnetism

52.

A rubber tire holds 2.3 moles of CO2 at a temperature of 273 K. The volume of the tire is 8 L. What is the Pressure?

(R = 0.0821)

a)

6.4 atm

b)

412.4 atm

c)

43.5 atm

d)

3.1 atm

53.

Which of the following set of conditions would allow a gas to behave ideally?

(HINT: Remember that gases like to spread far apart! Which conditions would allow the molecules to easily spread apart?)

a)

High Temperature, Low Pressure

b)

High Temperature, High Pressure

c)

Low Temperature, High Pressure

d)

Low Temperature, Low Pressure

54.
Which container will have lower pressure?
a)
left
b)
right
c)
they both have the same pressure
55.

Do molecules generally move faster at 45 C or 106 C?

a)

45 C because molecules have more energy than in 106C

b)

106 C because molecules have more energy than in 45C

c)

106 C because molecules have less energy than in 45C

d)

45C because molecules have less energy than in 106 C

56.

Define ΔH

a)

Change in Specific Heat; Heat by one Degree Celsius

b)

Change in Temperature; the energy we calculate; Degree Celsius

c)

Change in Enthalpy; the energy/heat we calculate

d)

Change in Time; time travel

57.

Define Exothermic

a)

Energy is released; ΔH is negative; Going from Gas to Liquid, Liquid to Solid

b)

Energy is absorbed; ΔH is positive; Going from Gas to Liquid, Liquid to Solid

c)

Energy is released; ΔH is positive; Going from Solid to Liquid, Liquid to Gas

d)

Energy is absorbed; ΔH is negative; Going from Gas to Liquid, Liquid to Solid

58.

Define Endothermic

a)

Energy is absorbed; ΔH is negative; Going from Liquid to Gas, and Gas to Liquid

b)

Energy is released; ΔH is negative; Going from Solid to Liquid, and Liquid to Gas

c)

Energy is released; ΔH is positive; Going from Solid to Liquid, and Liquid to Gas

d)

Energy is absorbed; ΔH is positive; Going from Solid to Liquid, and Liquid to Gas

59.

Specific Heat is..

a)

the temperature initial minus temperature final

b)

the amount of heat/energy required to raise 1 gram of a substance by 1°C (or K) aka "C"

c)

the temperature final minus temperature initial

d)

the item in a system with given weight in grams

60.
Water exists as a _____________ at 700 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
61.
What phase change(s) may occur at pressures below 4.58 mmHg?
a)
sublimation/deposition
b)
melting/freezing
c)
all phase changes are possible at these pressures
d)
vaporization/condensation
62.

What is true regarding CO2 for temperatures above 31 °C, past its critical point?

a)

It can never be liquified.

b)

It decomposes.

c)

It has a high pressure.

d)

It is a plasma.

63.
At 10 atm, dry ice is heated from -100 °C to 30 °C.  What changes occur?
a)
freezing, then condensation
b)
melting only
c)
sublimation only
d)
melting, then boiling
64.
What state of matter is X?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
65.
What state of matter is Y?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
66.
What state of matter is Z?
a)
solid 
b)
liquid
c)
gas
d)
supercritical fluid
67.
What change occurs from F to E?
a)
sublimation
b)
deposition
c)
melting
d)
condensation
68.
What change occurs from E to C?
a)
sublimation
b)
freezing
c)
melting
d)
boiling
69.
What change occurs from C to D?
a)
condensation
b)
vaporization
c)
melting
d)
sublimation
70.

What is the normal boiling point of this substance at standard pressure?

a)

150 °C

b)

100 °C

c)

-50 °C

d)

0 °C

71.

What is the normal melting point of this substance at standard pressure?

a)

150 °C

b)

100 °C

c)

-50 °C

d)

0 °C

72.
What is point A?
a)
triple point
b)
critical point
c)
equilibrium point
d)
normal melting point
73.
At 0.10 atm, what phase(s) can exist?
a)
solid, liquid or gas
b)
liquid or gas
c)
solid only
d)
gas only
74.
Water exists as a _____________ at 3 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
75.
Which statement is true for carbon dioxide at -60 °C?
a)
All three phases are possible.
b)
It can exist as a solid or a gas, depending on pressure.
c)
It is a solid.
d)
With enough pressure it can be melted.
76.
What line segment represents only the solid state?
a)
A-B
b)
B-C
c)
C-D
d)
D-E
77.
Between which points is the temperature of the substance remaining constant?
a)
A-B only. 
b)
A-B, C-D, E-F
c)
B-C only. 
d)
B-C, D-E
78.
Between which points is the temperature of the substance increasing?
a)
A-B only. 
b)
A-B, C-D, E-F
c)
B-C only. 
d)
B-C, D-E
79.
True or false: melting and freezing occur at the same temperature!
a)
True
b)
False
c)
I don't know
80.
A substance's heating curve is shown in the graph.  What is its boiling point?
a)
100 C
b)
60 C
c)
80 C
d)
20 C
81.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
82.
In which segment is the kinetic energy remaining constant?
a)
A-B
b)
B-C
c)
C-D
d)
E-F
83.
What line segment represents only the solid state?
a)
A-B
b)
B-C
c)
C-D
d)
D-E
84.

What is happening to the particles in the substance between points D and E?

a)

Melting

b)

Freezing

c)

Vaporizing

d)

Sublimating

85.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

86.

Where on the graph are phase changes taking place?

a)

1

b)

2

c)

3

d)

4

e)

5

87.
Between what two points is the most energy being added to the system
a)
A -B
b)
B-C
c)
C-D
d)
D-E
88.

Which equation represents Dalton's Law?

a)

E = mc2

b)

PV = nRT

c)

P1 / T1 = P2 / T2

d)

Ptotal = P1 + P2 + P3

89.

A mixture of H, Ne, & O has a pressure of 12.4 atm. If Hydrogen measures 5.6 atm and Oxygen measures 2.0 atm, what is the pressure of Neon?

a)

7.6 atm

b)

4.8 atm

c)

5.4 atm

d)

12.0 atm

90.

A container holds three gases: oxygen, carbon dioxide, and helium. The partial pressures of the three gases are 2.00 atm, 3.00 atm, and 4.00 atm, respectively. What is the total pressure inside the container?

a)

900 atm

b)

0.90 atm

c)

9.00 atm

d)

920 atm

91.
Determine the Kelvin temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure. 
a)
0 K 
b)
107 K 
c)
207 K 
d)
307 K 
92.
What is the pressure exerted by 5.00 moles of nitrogen gas contained in a 30.0 Liter container at 25.0 °C?
a)
3670 atm
b)
0.245 atm
c)
4.08 atm
d)
605 atm

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