Question 1

Two solutions (the system) , each with a volume of 25.0 mL at 25.0°C, are mixed in a beaker. A reaction occurs between them, and the temperature rises to 35.0°C. After the products have equilibrated with the surroundings, the temperature is again 25.0°C and the total volume is 50.0 mL. No gases are involved in the reaction. Which relationship concerning the change from initial to final states (both at 25.0°C)  is correct?

Accepted Answer

A)   ΔU = 0
B)   ΔH = 0
C)   ΔU > 0
D)   q = 0
E)   w = 0F) B) and E)
G) C) and E)

Question 2

Which of these is not a state function?

Accepted Answer

A)   volume
B)   temperature
C)   pressure
D)   heat
E)   energyF) B) and D)
G) C) and D)

Question 3

Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained.  Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and D)
G) All of the above

Question 4

A system expands from a volume of 1.00 L to 2.00 L against a constant external pressure of 1.00 atm. What is the work (w)  done by the system? (1 L·atm = 101.3 J)

Accepted Answer

A)   1.00 J
B)   2.00 J
C)   1.01 × 102 J
D)   1.01 × 105 J
E)   3.00 JF) A) and B)
G) A) and E)

Question 5

The sign of w when work is done by the system on the surroundings is ________.

Accepted Answer

The answer of The sign of w when work is...

Question 6

A system delivers 1275 J of heat while the surroundings perform 854 J of work on it. What is ΔU of the system?

Accepted Answer

A)   -2129 J
B)   -421 J
C)   +421 J
D)   +2129 J
E)   -1275 JF) D) and E)
G) C) and D)

Question 7

Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔHof for H2O(l) ?

Accepted Answer

A)   O2(g)  + 2H2(g)  → 2H2O(l) 
B)   ½O2(g)  + H (g)  → H2O(g) 
C)   H2(g)  + ½O2(g)  → H2O(l) 
D)   2H2O(l)  → O2(g)  + 2H2(g) 
E)   H2O(l)  → ½O2(g)  + H2(g) F) A) and E)
G) C) and D)

Question 8

When an automobile engine starts, the metal parts immediately begin to absorb heat released during the combustion of gasoline. How much heat will be absorbed by a 165-kg iron engine block when the temperature rises from 15.7°C to 95.7°C? (The specific heat of iron is 0.489 J/g·°C.)

Accepted Answer

The answer of When an automobile engine starts, the metal...

Question 9

Thunderstorms are powered by the heat released when water vapor changes to rain drops. How much heat is released when a gallon of rain falls? (1 gal = 3,785 g; specific heat of vaporization of water = 2,262 J/g)

Accepted Answer

The answer of Thunderstorms are powered by the heat released...

Question 10

Which of the following is incorrectly matched?

Accepted Answer

A)   Radiant energy; solar energy able to influence global climate patterns
B)   Thermal energy; related to temperature irrespective of the volume
C)   Energy; capacity to do work
D)   Chemical energy; potential energyE) All of the above
F) A) and D)

Question 11

Internal energy = ________ + ________

Accepted Answer

The answer of Internal energy = ________ + ________...

Question 12

A(n) ________ ________ is a process where heat is absorbed from the surroundings.

Accepted Answer

The answer of A(n) ________ ________ is a process where...

Question 13

What is the change in temperature if a 25.0-g block of aluminum absorbs 10.0 kJ of heat? The specific heat of aluminum is 0.900 J/g·°C.

Accepted Answer

A)   0.44°C
B)   22.5°C
C)   225°C
D)   360°C
E)   444°CF) A) and D)
G) A) and E)

Question 14

If 75.4 J of energy is absorbed by 0.25 mol of CCl4 at constant pressure, what is the change in temperature? The specific heat of CCl4 is 0.861 J/g·°C.

Accepted Answer

A)   17.8°C
B)   21.9°C
C)   2.3°C
D)   9.1°C
E)   44.6°CF) A) and D)
G) B) and C)

Question 15

The enthalpy change for making one mole of a compound from its elements is called the ________.

Accepted Answer

enthalpy o...

Question 16

At body temperature 2404 joules of energy are required to evaporate 1.00 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate the perspiration. A typical person perspires 25 mL of water after 20. minutes of exercise. How much body heat is this person using to evaporate this water?

Accepted Answer

The answer of At body temperature 2404 joules of energy...

Question 17

Naphthalene combustion may be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is -40.1 kJ/g. When 0.8210 g of naphthalene was burned in a bomb calorimeter containing 1.000 kg of water, a temperature rise of 4.21°C was observed. What is the heat capacity of the bomb calorimeter excluding the water?

Accepted Answer

A)   32.9 kJ/°C
B)   7.8 kJ/°C
C)   3.64 kJ/°C
D)   1.76 kJ/°C
E)   15.3 kJ/°CF) B) and E)
G) A) and B)

Question 18

A home aquarium is an example of an open system.

Accepted Answer

A) True 
 B)False

Question 19

Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV)  chloride? Ti(s)  + 2 Cl2(g)  → TiCl4(l)  ΔH = -804.2 kJ/mol
TiCl4(g)  → 2 Cl2(g)  + Ti(s)  ΔH = 763.2 kJ/mol

Accepted Answer

A)   +41.0 kJ/mol
B)   -1567.4 kJ/mol
C)   1567 kJ/mol
D)   -41.0 kJ/mol
E)   -763.7 kJ/molF) A) and B)
G) B) and C)

Question 20

What is q if 28.6 g of water is heated from 22.0°C to 78.3°C? The specific heat of water is 4.184 J/g·°C.

Accepted Answer

A)   2.60 J
B)   2.63 kJ
C)   6.74 kJ
D)   9.37 kJ
E)   3.94×104 kJF) D) and E)
G) A) and B)

Exam 5: Thermochemistry

What is q if 28.6 g of water is heated from 22.0°C to 78.3°C? The specific heat of water is 4.184 J/g·°C.

Correct Answer
verified

A system delivers 1275 J of heat while the surroundings perform 854 J of work on it. What is ΔU of the system?

Correct Answer
verified

Correct Answer
verified

The enthalpy change for making one mole of a compound from its elements is called the ________.

Correct Answer
verified
enthalpy o...
View Answer

Internal energy = +

Correct Answer
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What is the change in temperature if a 25.0-g block of aluminum absorbs 10.0 kJ of heat? The specific heat of aluminum is 0.900 J/g·°C.

Correct Answer
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Correct Answer
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The sign of w when work is done by the system on the surroundings is ________.

Correct Answer
verified

A system expands from a volume of 1.00 L to 2.00 L against a constant external pressure of 1.00 atm. What is the work (w) done by the system? (1 L·atm = 101.3 J)

Correct Answer
verified

When an automobile engine starts, the metal parts immediately begin to absorb heat released during the combustion of gasoline. How much heat will be absorbed by a 165-kg iron engine block when the temperature rises from 15.7°C to 95.7°C? (The specific heat of iron is 0.489 J/g·°C.)

Correct Answer
verified

If 75.4 J of energy is absorbed by 0.25 mol of CCl₄ at constant pressure, what is the change in temperature? The specific heat of CCl₄ is 0.861 J/g·°C.

Correct Answer
verified

Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔH^o_ffor H₂O(l) ?

Correct Answer
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Correct Answer
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Correct Answer
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A home aquarium is an example of an open system.

Correct Answer
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Which of the following is incorrectly matched?

Correct Answer
verified

Thunderstorms are powered by the heat released when water vapor changes to rain drops. How much heat is released when a gallon of rain falls? (1 gal = 3,785 g; specific heat of vaporization of water = 2,262 J/g)

Correct Answer
verified

A(n) is a process where heat is absorbed from the surroundings.

Correct Answer
verified

Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV) chloride? Ti(s) + 2 Cl₂(g) → TiCl₄(l) ΔH = -804.2 kJ/mol TiCl₄(g) → 2 Cl₂(g) + Ti(s) ΔH = 763.2 kJ/mol

Correct Answer
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Which of these is not a state function?

Correct Answer
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Exam 5: Thermochemistry

What is q if 28.6 g of water is heated from 22.0°C to 78.3°C? The specific heat of water is 4.184 J/g·°C.

Correct AnswerverifiedShow Answer

A system delivers 1275 J of heat while the surroundings perform 854 J of work on it. What is ΔU of the system?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The enthalpy change for making one mole of a compound from its elements is called the ________.

Correct Answerverifiedenthalpy o...View AnswerShow Answer

Internal energy = ________ + ________

Correct AnswerverifiedShow Answer

What is the change in temperature if a 25.0-g block of aluminum absorbs 10.0 kJ of heat? The specific heat of aluminum is 0.900 J/g·°C.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The sign of w when work is done by the system on the surroundings is ________.

Correct AnswerverifiedShow Answer

A system expands from a volume of 1.00 L to 2.00 L against a constant external pressure of 1.00 atm. What is the work (w) done by the system? (1 L·atm = 101.3 J)

Correct AnswerverifiedShow Answer

When an automobile engine starts, the metal parts immediately begin to absorb heat released during the combustion of gasoline. How much heat will be absorbed by a 165-kg iron engine block when the temperature rises from 15.7°C to 95.7°C? (The specific heat of iron is 0.489 J/g·°C.)

Correct AnswerverifiedShow Answer

If 75.4 J of energy is absorbed by 0.25 mol of CCl4 at constant pressure, what is the change in temperature? The specific heat of CCl4 is 0.861 J/g·°C.

Correct AnswerverifiedShow Answer

Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔHof for H2O(l) ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A home aquarium is an example of an open system.

Correct AnswerverifiedShow Answer

Which of the following is incorrectly matched?

Correct AnswerverifiedShow Answer

Thunderstorms are powered by the heat released when water vapor changes to rain drops. How much heat is released when a gallon of rain falls? (1 gal = 3,785 g; specific heat of vaporization of water = 2,262 J/g)

Correct AnswerverifiedShow Answer

A(n) ________ ________ is a process where heat is absorbed from the surroundings.

Correct AnswerverifiedShow Answer

Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV) chloride? Ti(s) + 2 Cl2(g) → TiCl4(l) ΔH = -804.2 kJ/mol TiCl4(g) → 2 Cl2(g) + Ti(s) ΔH = 763.2 kJ/mol

Correct AnswerverifiedShow Answer

Which of these is not a state function?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
enthalpy o...
View Answer

Internal energy = +

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

If 75.4 J of energy is absorbed by 0.25 mol of CCl₄ at constant pressure, what is the change in temperature? The specific heat of CCl₄ is 0.861 J/g·°C.

Correct Answer
verified

Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔH^o_ffor H₂O(l) ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

A(n) is a process where heat is absorbed from the surroundings.

Correct Answer
verified

Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV) chloride? Ti(s) + 2 Cl₂(g) → TiCl₄(l) ΔH = -804.2 kJ/mol TiCl₄(g) → 2 Cl₂(g) + Ti(s) ΔH = 763.2 kJ/mol

Correct Answer
verified

Correct Answer
verified