AnswersTX-Chemistry BUnit Test

Calorimetry Answers

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1
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The heat capacity of a sample should be divided by which quantity to find the specific heat capacity?

A
temperature in degrees Celsius
B
temperature in kelvins
C
volume in liters
D
mass in grams
2
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Loren has the samples of elements that are listed below at room temperature. He exposes the samples to the same heat source until each sample reaches a temperature of 90.0°C. 10 g of Al(s) ( = 0.897 J/(gi°C))10 g of Ag(s) (= 0.234 J/gi°C )10 g of Fe(s) ( = 0.450 J/gi°C)10 g of Zn(s) ( = 0.387 J/gi°C )From first to last, which lists the order in which these samples will reach 90.0°C?

Question illustration
A
Al, Fe, Zn, Ag
B
Ag, Zn, Fe, Al
C
Al, Fe, Ag, Zn
D
Ag, Al, Zn, Fe
3

The specific heat of water is 4.18 J/(gi°C) and that of wood is 1.97 J/(gi°C). Which statement is correct?

A
Regardless of mass, wood will heat up less than water if the same heat is added.
B
Given equal masses, wood will heat up less than water if the same heat is added.
C
Given equal masses, water will heat up less than wood if the same heat is added.
D
Regardless of mass, water will heat up less than wood if the same heat is added.
4

Which units express specific heat capacity?

A
J/°C, J/K, cal/°C, cal/K
B
J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)
C
J, cal
D
°C, K
5

Which units express heat capacity?

A
J/°C, J/K, cal/°C, cal/K
B
J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)
C
J, cal
D
°C, K
6

What would be the greatest difference in using an open ceramic coffee mug rather than an insulated mug with a lid as a calorimeter?

A
increased evaporation of the water
B
loss of gaseous reactants
C
inability to contain liquids
D
exchange of energy with the surroundings
7

Which statement defines calorimeter?

A
a device that measures the heat that is gained or lost in a chemical change
B
a device that measures the potential energy of an element
C
a device that is used to measure heat capacity
D
a device that is used to measure temperature
8

A sample of an unknown substance has a mass of 0.465 kg. If 3,000.0 J of heat is required to heat the substance from 50.0°C to 100.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.00775 J/(gi°C)
B
0.0600 J/(gi°C)
C
0.129 J/(gi°C)
D
0.155 J/(gi°C)
9

Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?Use .

Question illustration
A
30.9°C
B
34.5°C
C
44.0°C
D
51.5°C
10

When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)Use .

Question illustration
A
4.62 kJ
B
10.0 kJ
C
14.7 kJ
D
38.5 kJ
11

Which statement describes how a basic coffee cup calorimeter works?

A
It measures the mass of a substance given the specific heat and temperature of water in a cup of known size.
B
It measures the density of a substance given the mass, specific heat, and temperature of water in a cup of known size.
C
It uses the mass and specific heat of water along with a pressure gauge to measure the gain or loss of energy when a substance is added.
D
It uses the mass and specific heat of water along with a thermometer to measure the gain or loss of energy when a substance is added.
12

Which statement defines the heat capacity of a sample?

A
the temperature of a given sample
B
the temperature that a given sample can withstand
C
the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin)
D
the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure
13

A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?Use .

Question illustration
A
8.46 kJ
B
16.1 kJ
C
27.7 kJ
D
47.8 kJ
14

What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?Use .

Question illustration
A
0.00420 J/(gi°C)
B
0.00661 J/(gi°C)
C
238 J/(gi°C)
D
252 J/(gi°C)
15

What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?Use .

Question illustration
A
0.00420 J/(gi°C)
B
0.00661 J/(gi°C)
C
238 J/(gi°C)
D
252 J/(gi°C)
16

When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)Use .

Question illustration
A
4.62 kJ
B
10.0 kJ
C
14.7 kJ
D
38.5 kJ
17

Which statement best describes why specific heat capacity is often more useful than heat capacity for scientists when comparing two materials?

A
Specific heat capacity is an intensive property and does not depend on sample size.
B
Specific heat capacity is an extensive property and does not depend on sample size.
C
Specific heat capacity is an intensive property and depends on the sample size.
D
Specific heat capacity is an extensive property and depends on the sample size.
18

Which units express heat capacity?

A
J/°C, J/K, cal/°C, cal/K
B
J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)
C
J, cal
D
°C, K
19

Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?Use .

Question illustration
A
30.9°C
B
34.5°C
C
44.0°C
D
51.5°C
20

What would be the greatest difference in using an open ceramic coffee mug rather than an insulated mug with a lid as a calorimeter?

A
increased evaporation of the water
B
loss of gaseous reactants
C
inability to contain liquids
D
exchange of energy with the surroundings

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