Question 1

In the process of dissolving sugar in water,the entropy increases.This means that the sign of ΔS is ________,and that the randomness of the system ________.

Accepted Answer

A)  undetermined;increases
B)  positive;decreases
C)  positive;increases
D)  negative;decreases
E)  negative;increasesF) D) and E)
G) A) and C)

Question 2

Match the following.
-A process or reaction that has a negative value of ΔG

Accepted Answer

A)  exothermic
B)  activation energy
C)  chemical equilibrium
D)  endergonic
E)  exergonicF) endothermicG) B) and C)
H) A) and B)

Question 3

The function of a catalyst in a reaction system is to

Accepted Answer

A)  increase the yield of product.
B)  decrease the amount of heat produced.
C)  decrease the amount of energy consumed in the reaction.
D)  increase the rate of the reaction.
E)  decrease the amount of reactants consumed.F) C) and E)
G) B) and E)

Question 4

Match the following.
-The amount of energy which must be invested in a reaction to get it started

Accepted Answer

A)  exothermic
B)  activation energy
C)  chemical equilibrium
D)  endergonic
E)  exergonicF) endothermicG) A) and C)
H) B) and E)

Question 5

Which of the following processes involve an increase in entropy of the system?
I.Mothballs vaporize in a closet.
II.Blocks are assembled into a house.
III.Crystals grow from a sugar solution.
IV.Recyclable plastics are sorted.
V.Cake mix is manufactured from five basic ingredients.

Accepted Answer

A)  II,IV
B)  I,II,III
C)  II,III,IV
D)  I,V
E)  I,III,VF) A) and E)
G) B) and E)

Question 6

The scientific principle which explains the observation that the amount of heat transfer accompanying a change in one direction is numerically equal but opposite in sign to the amount of heat transfer in the opposite direction is

Accepted Answer

A)  the Law of Conservation of Energy.
B)  the Law of Conservation of Mass.
C)  the Law of Conservation of Mass and Energy.
D)  the Law of Definite Proportions.
E)  Avogadro's Law.F) A) and E)
G) None of the above

Question 7

Consider the reaction shown:
P4(s) + 10 Cl2(g) → 4 PCl5(s) + 452 kcal
When 50.00 g of P4 react,________ kcal will be ________.

Accepted Answer

A)  182.4;consumed
B)  452.0;produced
C)  729.7;produced
D)  182.4;produced
E)  452.0;consumedF) B) and E)
G) A) and B)

Question 8

Consider the reaction shown:
2 CO(g) + O2(g) → CO2(g) + 135.2 kcal
This reaction is ________ because the sign of ΔH is ________.

Accepted Answer

A)  endothermic;positive
B)  exothermic;positive
C)  endothermic;negative
D)  exothermic;negative
E)  exothermic;neither positive nor negativeF) B) and D)
G) A) and D)

Question 9

Which of the following states of matter should have the lowest entropy value?

Accepted Answer

A)  a crystalline solid
B)  a liquid
C)  a gas
D)  Two of these have virtually the same entropy.
E)  all of the aboveF) A) and B)
G) D) and E)

Question 10

The position of the equilibrium for a system where K = 4.6 × 10-15 can be described as being favored to ________;the concentration of products is relatively ________.

Accepted Answer

A)  the right;large
B)  the right;small
C)  the left;large
D)  the left;small
E)  neither direction;largeF) A) and E)
G) C) and D)

Question 11

Diatomic nitrogen is added to the equilibrium system:
N2(g) + H2(g)  2(g) + H2(g)   2 NH3(g) + heat When a new equilibrium is established the concentration of H2 will be ________ the amount at the original equilibrium,and the amount of NH3 will be ________ the amount at the original equilibrium. A) greater than;greater than B) greater than;less than C) less than;greater than D) less than;less than E) Both changes will be impossible to determine." class="answers-bank-image d-inline" rel="preload" >2 NH3(g) + heat
When a new equilibrium is established the concentration of H2 will be ________ the amount at the original equilibrium,and the amount of NH3 will be ________ the amount at the original equilibrium.

Accepted Answer

A)  greater than;greater than
B)  greater than;less than
C)  less than;greater than
D)  less than;less than
E)  Both changes will be impossible to determine.F) B) and E)
G) A) and E)

Question 12

Sketch a diagram to illustrate the role of orientation in determining whether a collision between molecules of two different diatomic elements will lead to formation of a compound.How could you illustrate the influence of energy considerations on this reaction?

Accepted Answer

The diagram should show the two diatomic...

Question 13

Match the following.
-A state in which the rate of the forward reaction is exactly equal to the rate of the reverse reaction

Accepted Answer

A)  exothermic
B)  activation energy
C)  chemical equilibrium
D)  endergonic
E)  exergonicF) endothermicG) B) and E)
H) A) and B)

Question 14

Entropy can be defined as the

Accepted Answer

A)  amount of energy required to rearrange chemical bonds.
B)  amount of energy required to initiate a reaction.
C)  number of chemical bonds which are changed during a reaction.
D)  state of equilibrium in a system.
E)  amount of disorder in a system.F) All of the above
G) B) and E)

Question 15

Calculate the enthalpy for the following reaction: N2 + O2 → 2 NO given the following bond dissociation energies:
N2 = 226 kcal/mol O2 = 119 kcal/mol NO = 145 kcal/mol.

Accepted Answer

A)  55 kcal/mol
B)  -55 kcal/mol
C)  235 kcal/mol
D)  -235 kcal/molE) B) and D)
F) None of the above

Question 16

Based on the reaction shown,which statement is true?
N2 + O2 → 2 NO ΔH = 43.2 kcal

Accepted Answer

A)  43.2 kcal are consumed when 1.00 g of N2 reacts.
B)  43.2 kcal are consumed when 1.00 g of O2 reacts.
C)  43.2 kcal are consumed when 1.00 mole of O2 reacts.
D)  43.2 kcal are produced when 1.00 mole of NO is produced.
E)  43.2 kcal are consumed when 1.00 g of NO is produced.F) None of the above
G) B) and E)

Question 17

All of the statements regarding the symbol ΔG are true except it

Accepted Answer

A)  refers to the free energy of the reaction.
B)  allows us to predict the spontaneity of a reaction.
C)  allows us to identify an exothermic reaction.
D)  allows us to identify an endergonic reaction.
E)  describes the effect of both enthalpy and entropy on a reaction.F) B) and E)
G) A) and B)

Question 18

A process which is unfavorable with respect to enthalpy,but favorable with respect to entropy could

Accepted Answer

A)  occur at low temperatures,but not at higher temperatures.
B)  occur at high temperatures,but not at lower temperatures.
C)  not occur regardless of temperature.
D)  occur at any temperature.
E)  none of the aboveF) All of the above
G) D) and E)

Question 19

Based on the reaction shown,which statement is true?
4 PCl3(l) → P4(s) + 6 Cl2(g) ΔH = 304.0 kcal

Accepted Answer

A)  When 1 mol PCl3(l) reacts,304.0 kcal are released.
B)  When 1 mol P4(s) is produced,304.0 kcal are consumed.
C)  When 548.56 g PCl3(l) react,304.0 kcal are released.
D)  When 137.14 g PCl3(l) react,304.0 kcal are consumed.
E)  When 123.88 g P4(s) are produced,304.0 kcal are released.F) B) and C)
G) A) and C)

Question 20

How much heat is released during the combustion of methane using the given bond dissociation energies:
CH4 + 2 O2 → CO2 + 2H2O
Number and types of bonds in each molecule:
CH4 (4 C-H bonds) ;O2 (1 O=O) ; (2 C=O bonds) ; (2 O-H bonds) .
Bond dissociation energies:
C-C (347 kJ/mol) ;C-H (413 kJ/mol) ;O=O (498 kJ/mol;C=O (799 kJ/mol) ;O-H (467 kJ/mol)

Accepted Answer

A)  -382 kJ
B)  -8181 kJ
C)  282 kJ
D)  818 kJ
E)  696 kJF) A) and E)
G) None of the above

Exam 7: Chemical Reactions: Energy, rates, and Equilibrium

A process which is unfavorable with respect to enthalpy,but favorable with respect to entropy could

Correct Answer
verified

In the process of dissolving sugar in water,the entropy increases.This means that the sign of ΔS is ,and that the randomness of the system .

Correct Answer
verified

Based on the reaction shown,which statement is true? 4 PCl₃(l) → P₄(s) + 6 Cl₂(g) ΔH = 304.0 kcal

Correct Answer
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Diatomic nitrogen is added to the equilibrium system: N₂(g) + H₂(g) 2 NH₃(g) + heat When a new equilibrium is established the concentration of H₂ will be the amount at the original equilibrium,and the amount of NH₃ will be the amount at the original equilibrium.

Correct Answer
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Match the following. -A process or reaction that has a negative value of ΔG

Correct Answer
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The position of the equilibrium for a system where K = 4.6 × 10^-15 can be described as being favored to ;the concentration of products is relatively .

Correct Answer
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Entropy can be defined as the

Correct Answer
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Consider the reaction shown: P₄(s) + 10 Cl₂(g) → 4 PCl₅(s) + 452 kcal When 50.00 g of P₄ react, kcal will be .

Correct Answer
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The scientific principle which explains the observation that the amount of heat transfer accompanying a change in one direction is numerically equal but opposite in sign to the amount of heat transfer in the opposite direction is

Correct Answer
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All of the statements regarding the symbol ΔG are true except it

Correct Answer
verified

Correct Answer
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Match the following. -A state in which the rate of the forward reaction is exactly equal to the rate of the reverse reaction

Correct Answer
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Calculate the enthalpy for the following reaction: N₂ + O₂ → 2 NO given the following bond dissociation energies: N₂ = 226 kcal/mol O₂ = 119 kcal/mol NO = 145 kcal/mol.

Correct Answer
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Sketch a diagram to illustrate the role of orientation in determining whether a collision between molecules of two different diatomic elements will lead to formation of a compound.How could you illustrate the influence of energy considerations on this reaction?

Correct Answer
verified
The diagram should show the two diatomic...
View Answer

Which of the following states of matter should have the lowest entropy value?

Correct Answer
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Based on the reaction shown,which statement is true? N₂ + O₂ → 2 NO ΔH = 43.2 kcal

Correct Answer
verified

Consider the reaction shown: 2 CO(g) + O₂(g) → CO₂(g) + 135.2 kcal This reaction is because the sign of ΔH is .

Correct Answer
verified

The function of a catalyst in a reaction system is to

Correct Answer
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Which of the following processes involve an increase in entropy of the system? I.Mothballs vaporize in a closet. II.Blocks are assembled into a house. III.Crystals grow from a sugar solution. IV.Recyclable plastics are sorted. V.Cake mix is manufactured from five basic ingredients.

Correct Answer
verified

Match the following. -The amount of energy which must be invested in a reaction to get it started

Correct Answer
verified

Exam 7: Chemical Reactions: Energy, rates, and Equilibrium

A process which is unfavorable with respect to enthalpy,but favorable with respect to entropy could

Correct AnswerverifiedShow Answer

In the process of dissolving sugar in water,the entropy increases.This means that the sign of ΔS is ________,and that the randomness of the system ________.

Correct AnswerverifiedShow Answer

Based on the reaction shown,which statement is true? 4 PCl3(l) → P4(s) + 6 Cl2(g) ΔH = 304.0 kcal

Correct AnswerverifiedShow Answer

Diatomic nitrogen is added to the equilibrium system: N2(g) + H2(g) 2 NH3(g) + heat When a new equilibrium is established the concentration of H2 will be ________ the amount at the original equilibrium,and the amount of NH3 will be ________ the amount at the original equilibrium.

Correct AnswerverifiedShow Answer

Match the following. -A process or reaction that has a negative value of ΔG

Correct AnswerverifiedShow Answer

The position of the equilibrium for a system where K = 4.6 × 10-15 can be described as being favored to ________;the concentration of products is relatively ________.

Correct AnswerverifiedShow Answer

Entropy can be defined as the

Correct AnswerverifiedShow Answer

Consider the reaction shown: P4(s) + 10 Cl2(g) → 4 PCl5(s) + 452 kcal When 50.00 g of P4 react,________ kcal will be ________.

Correct AnswerverifiedShow Answer

The scientific principle which explains the observation that the amount of heat transfer accompanying a change in one direction is numerically equal but opposite in sign to the amount of heat transfer in the opposite direction is

Correct AnswerverifiedShow Answer

All of the statements regarding the symbol ΔG are true except it

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Match the following. -A state in which the rate of the forward reaction is exactly equal to the rate of the reverse reaction

Correct AnswerverifiedShow Answer

Calculate the enthalpy for the following reaction: N2 + O2 → 2 NO given the following bond dissociation energies: N2 = 226 kcal/mol O2 = 119 kcal/mol NO = 145 kcal/mol.

Correct AnswerverifiedShow Answer

Sketch a diagram to illustrate the role of orientation in determining whether a collision between molecules of two different diatomic elements will lead to formation of a compound.How could you illustrate the influence of energy considerations on this reaction?

Correct AnswerverifiedThe diagram should show the two diatomic...View AnswerShow Answer

Which of the following states of matter should have the lowest entropy value?

Correct AnswerverifiedShow Answer

Based on the reaction shown,which statement is true? N2 + O2 → 2 NO ΔH = 43.2 kcal

Correct AnswerverifiedShow Answer

Consider the reaction shown: 2 CO(g) + O2(g) → CO2(g) + 135.2 kcal This reaction is ________ because the sign of ΔH is ________.

Correct AnswerverifiedShow Answer

The function of a catalyst in a reaction system is to

Correct AnswerverifiedShow Answer

Which of the following processes involve an increase in entropy of the system? I.Mothballs vaporize in a closet. II.Blocks are assembled into a house. III.Crystals grow from a sugar solution. IV.Recyclable plastics are sorted. V.Cake mix is manufactured from five basic ingredients.

Correct AnswerverifiedShow Answer

Match the following. -The amount of energy which must be invested in a reaction to get it started

Correct AnswerverifiedShow Answer

Correct Answer
verified

In the process of dissolving sugar in water,the entropy increases.This means that the sign of ΔS is ,and that the randomness of the system .

Correct Answer
verified

Based on the reaction shown,which statement is true? 4 PCl₃(l) → P₄(s) + 6 Cl₂(g) ΔH = 304.0 kcal

Correct Answer
verified

Diatomic nitrogen is added to the equilibrium system: N₂(g) + H₂(g) 2 NH₃(g) + heat When a new equilibrium is established the concentration of H₂ will be the amount at the original equilibrium,and the amount of NH₃ will be the amount at the original equilibrium.

Correct Answer
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Correct Answer
verified

The position of the equilibrium for a system where K = 4.6 × 10^-15 can be described as being favored to ;the concentration of products is relatively .

Correct Answer
verified

Correct Answer
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Consider the reaction shown: P₄(s) + 10 Cl₂(g) → 4 PCl₅(s) + 452 kcal When 50.00 g of P₄ react, kcal will be .

Correct Answer
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Correct Answer
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Correct Answer
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Calculate the enthalpy for the following reaction: N₂ + O₂ → 2 NO given the following bond dissociation energies: N₂ = 226 kcal/mol O₂ = 119 kcal/mol NO = 145 kcal/mol.

Correct Answer
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Correct Answer
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The diagram should show the two diatomic...
View Answer

Correct Answer
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Based on the reaction shown,which statement is true? N₂ + O₂ → 2 NO ΔH = 43.2 kcal

Correct Answer
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Consider the reaction shown: 2 CO(g) + O₂(g) → CO₂(g) + 135.2 kcal This reaction is because the sign of ΔH is .

Correct Answer
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Correct Answer
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