AnswersChemistry 1A - Mr. KaanWriting and Balancing Chemical Equations

Calorimetry Answers

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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
2
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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
3

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
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

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
6

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.
7

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.
8

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
9

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.
10

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
11

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)
12

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
13

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)
14

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
15

The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction?Use .

Question illustration
A
140 J
B
418 J
C
1,470 J
D
5,170 J

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