Question 1

Which of the following has a standard enthalpy of formation value of zero at 25°C?

Accepted Answer

A)   I(g) 
B)   I2(l) 
C)   I2(s) 
D)   I(s) 
E)   I2(g)

Question 2

Heat capacity is defined as

Accepted Answer

A)   the amount of heat required to raise the temperature of 1 gram of substance by 1 K.
B)   the amount of heat required to raise the temperature of a substance by 1 K.
C)   the amount of heat required to vaporize a solid or liquid.
D)   the maximum amount of heat that a substance may absorb without decomposing.
E)   4.18 cal/g.K.

Question 3

Given the thermochemical equation rHº for the following reaction.    A)  (+88.2 kJ/mol-rxn)  B)  (+264.5  kJ/mol-rxn)  C)  ( +529.0 kJ/mol-rxn)  D)  (-176.3 kJ/mol-rxn)  E)  (-176.3 kJ/mol-rxn) . " class="answers-bank-image d-inline" rel="preload" >

Find  Δ\DeltaΔ rHº for the following reaction. 
rHº for the following reaction.    A)  (+88.2 kJ/mol-rxn)  B)  (+264.5  kJ/mol-rxn)  C)  ( +529.0 kJ/mol-rxn)  D)  (-176.3 kJ/mol-rxn)  E)  (-176.3 kJ/mol-rxn) . " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   (+88.2 kJ/mol-rxn) 
B)   (+264.5  kJ/mol-rxn) 
C)   ( +529.0 kJ/mol-rxn) 
D)   (-176.3 kJ/mol-rxn) 
E)   (-176.3 kJ/mol-rxn) .

Question 4

Specific heat capacity is

Accepted Answer

A)   the quantity of heat needed to change the temperature of 1.00 g of a substance by 1 K.
B)   the quantity of heat needed to change the temperature of 1.00 g of a substance by 4.184 K.
C)   the capacity of a substance to gain or lose a 1.00 J of energy in the form of heat.
D)   the temperature change undergone when 1.00 g of a substance absorbs 4.184 J.
E)   the maximum amount of energy in the form of heat that 1.00 g of a substance may absorb without decomposing.

Question 5

Which of the following thermodynamic quantities are state functions: heat (q) ,work (w) ,enthalpy change ( Δ\DeltaΔ H) ,and/or internal energy change ( Δ\DeltaΔ U) ?

Accepted Answer

A)   q only
B)   w only
C)   ( Δ\DeltaΔ H)  only
D)   ( Δ\DeltaΔ U)  only
E)   ( Δ\DeltaΔ H)  and ( Δ\DeltaΔ U)

Question 6

If q = 98 kJ and w = 4 kJ for a certain process,that process

Accepted Answer

A)   requires a catalyst.
B)   is endothermic.
C)   occurs slowly.
D)   is exothermic.
E)   cannot occur.

Question 7

When 0.236 mol of a weak base (A-) is reacted with excess HCl,6.91 kJ of energy is released as heat.What is  Δ\DeltaΔ H for this reaction per mole of A- consumed?

Accepted Answer

A)   -34.2 kJ/mol
B)   -59.4 kJ/mol
C)   -29.3 kJ/mol
D)   34.2 kJ/mol
E)   29.3 kJ/mol

Question 8

Which of the following processes is/are exothermic?
1) the reaction of butane with oxygen
2) the melting of gold
3) cooling copper from 225  ∘\circ∘ C to 65  ∘\circ∘ C

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 3
E)   1,2,and 3

Question 9

Which of these physical changes would require the release of energy?

Accepted Answer

A)   condensing a gas
B)   boiling a liquid
C)   melting a solid
D)   all of these
E)   none of these

Question 10

When 50.0 mL of 1.30 M of HCl(aq) is combined with 50.0 mL of 1.20 M of NaOH(aq) in a coffee-cup calorimeter,the temperature of the solution increases by 8.01°C.What is the change in enthalpy for this balanced reaction?

HCl(aq) + NaOH(aq)  →	o→  NaCl(aq) + H2O(l)

Assume that the solution density is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/g. ∘\circ∘ C.

Accepted Answer

A)   -55.8 kJ
B)   55.8 kJ
C)   51.5 kJ
D)   -51.5 kJ
E)   -26.8 kJ

Question 11

Dry ice converts directly from a solid to a gas when heated.This process is called ________.

Accepted Answer

The answer of Dry ice converts directly from a solid...

Question 12

Determine  Δ\DeltaΔ rH ∘\circ∘  for the following reaction,
2 NH3(g) + 5/2 O2(g)  →	o→  2 NO(g) + 3 H2O(g) 
Given the thermochemical equations below.rH \circ  for the following reaction, 2 NH3(g) + 5/2 O2(g)  	o  2 NO(g) + 3 H2O(g)  Given the thermochemical equations below.  A)  -1178.2 kJ/mol-rxn B)  -452.8 kJ/mol-rxn C)  -394.6 kJ/mol-rxn D)  -211.0 kJ/mol-rxn E)  +1178.2 kJ/mol-rxn " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -1178.2 kJ/mol-rxn
B)   -452.8 kJ/mol-rxn
C)   -394.6 kJ/mol-rxn
D)   -211.0 kJ/mol-rxn
E)   +1178.2 kJ/mol-rxn

Question 13

Using the following thermochemical data:
rH \circ  for the following reaction: HoF3(s) + 3HCl(g)  	o  HoCl3(s) + 3HF(g)  A)  -3244.4 kJ/mol-rxn B)  330.4 kJ/mol-rxn C)  165.2 kJ/mol-rxn D)  660.8 kJ/mol-rxn E)  -1622.2 kJ/mol-rxn " class="answers-bank-image d-inline" rel="preload" >
Calculate  Δ\DeltaΔ rH ∘\circ∘  for the following reaction:
HoF3(s) + 3HCl(g)  →	o→  HoCl3(s) + 3HF(g)

Accepted Answer

A)   -3244.4 kJ/mol-rxn
B)   330.4 kJ/mol-rxn
C)   165.2 kJ/mol-rxn
D)   660.8 kJ/mol-rxn
E)   -1622.2 kJ/mol-rxn

Question 14

If 50.0 g of benzene,C6H6,at 25.0  ∘\circ∘ C absorbs 2.71 kJ of energy in the form of heat,what is the final temperature of the benzene? The specific heat capacity of benzene is 1.72 J/g.K.

Accepted Answer

A)   25.0  ∘\circ∘ C
B)   31.5  ∘\circ∘ C
C)   56.5  ∘\circ∘ C
D)   32.3  ∘\circ∘ C
E)   57.3  ∘\circ∘ C

Exam 6: Principles of Chemical Reactivity: Energy and Chemical Reactions

If q = 98 kJ and w = 4 kJ for a certain process,that process

Correct Answer
verified

Which of the following has a standard enthalpy of formation value of zero at 25°C?

Correct Answer
verified

Correct Answer
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Heat capacity is defined as

Correct Answer
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Which of these physical changes would require the release of energy?

Correct Answer
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Dry ice converts directly from a solid to a gas when heated.This process is called ________.

Correct Answer
verified

Which of the following processes is/are exothermic? 1) the reaction of butane with oxygen 2) the melting of gold 3) cooling copper from 225 ^$\circ$C to 65 ^$\circ$C

Correct Answer
verified

Correct Answer
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If 50.0 g of benzene,C₆H₆,at 25.0 ^$\circ$C absorbs 2.71 kJ of energy in the form of heat,what is the final temperature of the benzene? The specific heat capacity of benzene is 1.72 J/g.K.

Correct Answer
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Which of the following thermodynamic quantities are state functions: heat (q) ,work (w) ,enthalpy change ( $\Delta$ H) ,and/or internal energy change ( $\Delta$ U) ?

Correct Answer
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Correct Answer
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Correct Answer
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When 0.236 mol of a weak base (A^-) is reacted with excess HCl,6.91 kJ of energy is released as heat.What is $\Delta$ H for this reaction per mole of A^- consumed?

Correct Answer
verified

Specific heat capacity is

Correct Answer
verified

Exam 6: Principles of Chemical Reactivity: Energy and Chemical Reactions

If q = 98 kJ and w = 4 kJ for a certain process,that process

Correct AnswerverifiedShow Answer

Which of the following has a standard enthalpy of formation value of zero at 25°C?

Correct AnswerverifiedShow Answer

Determine Δ\DeltaΔ rH ∘\circ∘ for the following reaction, 2 NH3(g) + 5/2 O2(g) →\to→ 2 NO(g) + 3 H2O(g) Given the thermochemical equations below.

Correct AnswerverifiedShow Answer

Heat capacity is defined as

Correct AnswerverifiedShow Answer

Which of these physical changes would require the release of energy?

Correct AnswerverifiedShow Answer

Dry ice converts directly from a solid to a gas when heated.This process is called ________.

Correct AnswerverifiedShow Answer

Which of the following processes is/are exothermic? 1) the reaction of butane with oxygen 2) the melting of gold 3) cooling copper from 225 ∘\circ∘ C to 65 ∘\circ∘ C

Correct AnswerverifiedShow Answer

Using the following thermochemical data: Calculate Δ\DeltaΔ rH ∘\circ∘ for the following reaction: HoF3(s) + 3HCl(g) →\to→ HoCl3(s) + 3HF(g)

Correct AnswerverifiedShow Answer

If 50.0 g of benzene,C6H6,at 25.0 ∘\circ∘ C absorbs 2.71 kJ of energy in the form of heat,what is the final temperature of the benzene? The specific heat capacity of benzene is 1.72 J/g.K.

Correct AnswerverifiedShow Answer

Which of the following thermodynamic quantities are state functions: heat (q) ,work (w) ,enthalpy change ( Δ\DeltaΔ H) ,and/or internal energy change ( Δ\DeltaΔ U) ?

Correct AnswerverifiedShow Answer

Given the thermochemical equation Find Δ\DeltaΔ rHº for the following reaction.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When 0.236 mol of a weak base (A-) is reacted with excess HCl,6.91 kJ of energy is released as heat.What is Δ\DeltaΔ H for this reaction per mole of A- consumed?

Correct AnswerverifiedShow Answer

Specific heat capacity is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following processes is/are exothermic? 1) the reaction of butane with oxygen 2) the melting of gold 3) cooling copper from 225 ^$\circ$C to 65 ^$\circ$C

Correct Answer
verified

Correct Answer
verified

If 50.0 g of benzene,C₆H₆,at 25.0 ^$\circ$C absorbs 2.71 kJ of energy in the form of heat,what is the final temperature of the benzene? The specific heat capacity of benzene is 1.72 J/g.K.

Correct Answer
verified

Which of the following thermodynamic quantities are state functions: heat (q) ,work (w) ,enthalpy change ( $\Delta$ H) ,and/or internal energy change ( $\Delta$ U) ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

When 0.236 mol of a weak base (A^-) is reacted with excess HCl,6.91 kJ of energy is released as heat.What is $\Delta$ H for this reaction per mole of A^- consumed?

Correct Answer
verified

Correct Answer
verified