Answers25-26 KCS18 Chemistry ICHeat

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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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
3

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
4

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
5

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
6

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
7

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.
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 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.
10

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

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Calorimetry Answers — 25-26 KCS18 Chemistry IC