Question 1

Which thermodynamic function is most related to disorder and probability?

Accepted Answer

A) enthalpy 
B) internal energy 
C) entropy 
D) heat capacity 
A) enthalpy 
B) internal energy 
C) entropy 
D) heat capacity

Question 2

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease?
432 kJ + A + 2 B → 3 C

Accepted Answer

The answer of When the reaction below is performed in...

Question 3

For a process at constant pressure,

Accepted Answer

A) ΔE = w and q = 0. 
B) ΔE = q and w = 0. 
C) ΔE = ΔH. 
D) ΔH = q. 
A) ΔE = w and q = 0. 
B) ΔE = q and w = 0. 
C) ΔE = ΔH. 
D) ΔH = q.

Question 4

The net reaction is represented by

Accepted Answer

A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line F. 
A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line F.

Question 5

Which is not a spontaneous process?

Accepted Answer

A) combustion of gasoline to produce carbon dioxide and water 
B) diffusion of perfume in a room 
C) dissolution of sodium chloride in water 
D) freezing of water at 1°C 
A) combustion of gasoline to produce carbon dioxide and water 
B) diffusion of perfume in a room 
C) dissolution of sodium chloride in water 
D) freezing of water at 1°C

Question 6

-What are the signs of ΔH and ΔS for the reaction represented in the above drawing?

Accepted Answer

A) ΔH = +,ΔS = + 
B) ΔH = +,ΔS = - 
C) ΔH = -,ΔS = + 
D) ΔH = -,ΔS = - 
A) ΔH = +,ΔS = + 
B) ΔH = +,ΔS = - 
C) ΔH = -,ΔS = + 
D) ΔH = -,ΔS = -

Question 7

The following drawing is a representation of a reaction for which ΔH° = +62 kJ.This reaction is likely to be

Accepted Answer

A) nonspontaneous at all temperatures. 
B) nonspontaneous at low temperatures and spontaneous at high temperatures. 
C) spontaneous at low temperatures and nonspontaneous at high temperatures. 
D) spontaneous at all temperatures. 
A) nonspontaneous at all temperatures. 
B) nonspontaneous at low temperatures and spontaneous at high temperatures. 
C) spontaneous at low temperatures and nonspontaneous at high temperatures. 
D) spontaneous at all temperatures.

Question 8

When 1.50 g of Ba(s)is added to 100.00 g of water in a container open to the atmosphere,the reaction shown below occurs and the temperature of the resulting solution rises from 22.00°C to 33.10°C.If the specific heat of the solution is 4.18 J/(g ∙ °C),calculate ΔH for the reaction,as written.
Ba(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ H2(g)ΔH = ?

Accepted Answer

A) -431 kJ 
B) -3.14 kJ 
C) +3.14 kJ 
D) +431 kJ 
A) -431 kJ 
B) -3.14 kJ 
C) +3.14 kJ 
D) +431 kJ

Question 9

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l)from 35.0°C to gaseous CCl4 76.8°C (the normal boiling point for CCl4)? The specific heat of CCl4(l)is
0)857 J/(g ∙°C),its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

Accepted Answer

A) 0)896 kJ 
B) 1)43 kJ 
C) 5)74 kJ 
D) 6)28 kJ 
A) 0)896 kJ 
B) 1)43 kJ 
C) 5)74 kJ 
D) 6)28 kJ

Question 10

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Accepted Answer

A) ΔH is negative and ΔS is positive 
B) ΔH is zero and Δ△S is positive 
C) ΔH is zero and ΔS is negative 
D) ΔH is positive and ΔS is negative 
A) ΔH is negative and ΔS is positive 
B) ΔH is zero and Δ△S is positive 
C) ΔH is zero and ΔS is negative 
D) ΔH is positive and ΔS is negative

Question 11

Kinetic energy increases with increasing ________ and increasing ________.

Accepted Answer

The answer of Kinetic energy increases with increasing ________ and...

Question 12

Water has an unusually high

Accepted Answer

A) electrical conductivity. 
B) heat of combustion. 
C) heat of formation. 
D) specific heat. 
A) electrical conductivity. 
B) heat of combustion. 
C) heat of formation. 
D) specific heat.

Question 13

At constant pressure for the reaction shown below,what can be said about PΔV and ΔE?
N2(g)+ 3 H2(g)→ 2 NH3(g)ΔH° = - 92.2 kJ

Accepted Answer

A) PΔV > 0 and ΔE > -92.2 kJ B) PΔV > 0 and ΔE -92.2 kJ D) PΔV < 0 and ΔE < -92.2 kJ A) PΔV > 0 and ΔE > -92.2 kJ B) PΔV > 0 and ΔE -92.2 kJ D) PΔV < 0 and ΔE < -92.2 kJ

Question 14

How much heat is absorbed/released when 20.00 g of NH3(g)reacts in the presence of excess O2(g)to produce NO(g)and H2O(l)according to the following chemical equation?
4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(l)ΔH° = +1168 kJ

Accepted Answer

A) 342.9 kJ of heat are absorbed. 
B) 342.9 kJ of heat are released. 
C) 1372 kJ of heat are absorbed. 
D) 1372 kJ of heat are released. 
A) 342.9 kJ of heat are absorbed. 
B) 342.9 kJ of heat are released. 
C) 1372 kJ of heat are absorbed. 
D) 1372 kJ of heat are released.

Question 15

The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.

Accepted Answer

A) 20.3 kJ of heat are absorbed. 
B) 20.3 kJ of heat are released. 
C) 81.3 kJ of heat are absorbed. 
D) 81.3 kJ of heat are released. 
A) 20.3 kJ of heat are absorbed. 
B) 20.3 kJ of heat are released. 
C) 81.3 kJ of heat are absorbed. 
D) 81.3 kJ of heat are released.

Question 16

Acetylene torches utilize the following reaction:
2 C2H2(g)+ 5 O2(g)→ 4 CO2(g)+ 2 H2O(g)
Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Accepted Answer

A) 2512.4 kJ 
B) 1256.2 kJ 
C) -1256.2 kJ 
D) -2512.4 kJ 
A) 2512.4 kJ 
B) 1256.2 kJ 
C) -1256.2 kJ 
D) -2512.4 kJ

Question 17

Which of the following is not a state function?

Accepted Answer

A) altitude 
B) heat 
C) internal energy 
D) volume 
A) altitude 
B) heat 
C) internal energy 
D) volume

Question 18

Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts:
CO(g)+ 2 H2(g)→ CH3OH(l)at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K
Find ΔG° at 25°C.

Accepted Answer

A) -157.2 kJ 
B) -29.1 kJ 
C) 98.9 kJ 
D) 157.2 kJ 
A) -157.2 kJ 
B) -29.1 kJ 
C) 98.9 kJ 
D) 157.2 kJ

Question 19

At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

Accepted Answer

A) H2. 
B) He. 
C) N2. 
D) All have the same average velocity. 
A) H2. 
B) He. 
C) N2. 
D) All have the same average velocity.

Question 20

For the reaction 2CH4 (g)+ 3 Cl2 (g)→ 2 CHCl3 (l)+ 3 H2 (g),ΔH° = -118.6 kJ.
ΔH°f = -134.1 kJ/mol for CHCl3 (l).Find ΔH°f for CH4 (g).

Accepted Answer

A) -193.4 kJ/mol 
B) -74.8 kJ/mol 
C) 74.8 kJ/mol 
D) 193.4 kJ/mol 
A) -193.4 kJ/mol 
B) -74.8 kJ/mol 
C) 74.8 kJ/mol 
D) 193.4 kJ/mol

Exam 8: Thermochemistry: Chemical Energy

Which thermodynamic function is most related to disorder and probability?

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease? 432 kJ + A + 2 B → 3 C

For a process at constant pressure,

The net reaction is represented by

Which is not a spontaneous process?

-What are the signs of ΔH and ΔS for the reaction represented in the above drawing?

The following drawing is a representation of a reaction for which ΔH° = +62 kJ.This reaction is likely to be

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l)from 35.0°C to gaseous CCl4 76.8°C (the normal boiling point for CCl4)? The specific heat of CCl4(l)is 0)857 J/(g ∙°C),its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Kinetic energy increases with increasing ________ and increasing ________.

Water has an unusually high

At constant pressure for the reaction shown below,what can be said about PΔV and ΔE? N2(g)+ 3 H2(g)→ 2 NH3(g)ΔH° = - 92.2 kJ

How much heat is absorbed/released when 20.00 g of NH3(g)reacts in the presence of excess O2(g)to produce NO(g)and H2O(l)according to the following chemical equation? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(l)ΔH° = +1168 kJ

The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.

Acetylene torches utilize the following reaction: 2 C2H2(g)+ 5 O2(g)→ 4 CO2(g)+ 2 H2O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Which of the following is not a state function?

Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts: CO(g)+ 2 H2(g)→ CH3OH(l)at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K Find ΔG° at 25°C.

At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

For the reaction 2CH4 (g)+ 3 Cl2 (g)→ 2 CHCl3 (l)+ 3 H2 (g),ΔH° = -118.6 kJ. ΔH°f = -134.1 kJ/mol for CHCl3 (l).Find ΔH°f for CH4 (g).

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Calculate the total quantity of heat required to convert 25.0 g of liquid CCl₄(l)from 35.0°C to gaseous CCl₄ 76.8°C (the normal boiling point for CCl₄)? The specific heat of CCl₄(l)is 0)857 J/(g ∙°C),its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

Kinetic energy increases with increasing and increasing .

At constant pressure for the reaction shown below,what can be said about PΔV and ΔE? N₂(g)+ 3 H₂(g)→ 2 NH₃(g)ΔH° = - 92.2 kJ

How much heat is absorbed/released when 20.00 g of NH₃(g)reacts in the presence of excess O₂(g)to produce NO(g)and H₂O(l)according to the following chemical equation? 4 NH₃(g)+ 5 O₂(g)→ 4 NO(g)+ 6 H₂O(l)ΔH° = +1168 kJ

Acetylene torches utilize the following reaction: 2 C₂H₂(g)+ 5 O₂(g)→ 4 CO₂(g)+ 2 H₂O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts: CO(g)+ 2 H₂(g)→ CH₃OH(l)at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K Find ΔG° at 25°C.

At 298 K the average kinetic energy is the same for H₂,He,and N₂.The gas with the highest average velocity is

For the reaction 2CH₄ (g)+ 3 Cl₂ (g)→ 2 CHCl₃ (l)+ 3 H₂ (g),ΔH° = -118.6 kJ. ΔH°_f = -134.1 kJ/mol for CHCl₃ (l).Find ΔH°_f for CH₄ (g).