Question 1

Given the equations A + 6B → 4E ΔH = −234 kJ
2B +4C → 2E ΔH = −100 kJ
What is the ΔH for the reaction A + 2B → 8C?

Accepted Answer

A)   +34 kJ
B)   −34 kJ
C)   +134 kJ
D)   +434 kJ
E)   −434 kJF) A) and E)
G) B) and E)

Question 2

What is the work performed by a gas, if it expands from 5.00 L to 15.0 L against a constant external pressure of 1.62 atm? Express the final answer in joules.

Accepted Answer

A)   -1,640 J
B)   -3,280 J
C)   -1,230 J
D)   -2,460 J
E)   -1,850 JF) A) and D)
G) B) and D)

Question 3

A chemical equation that includes an enthalpy change is called a(n)  _____.

Accepted Answer

A)   ionic equation
B)   hydro equation
C)   radioactive equation
D)   thermochemical equation
E)   electrochemical equationF) C) and E)
G) B) and C)

Question 4

_____ refers to the heat of a process when pressure is held constant.

Accepted Answer

A)   Exothermic transformation
B)   Entropy change
C)   Specific heat
D)   Radiation
E)   Enthalpy changeF) A) and B)
G) A) and C)

Question 5

Given the thermochemical equation.
N2(g) + O2(g) → 2NO(g) ΔH = +180.6 kJ
If 7.00g of N2 will be reacted, 45.2 kJ will be added. (Molar masses: N = 14 g; O = 16 g)

Accepted Answer

A) True 
 B)False

Question 6

Consider the thermochemical equation: N2 + O2 → 2NO; ΔH = +180.6 kJ
How many moles of nitrogen should be reacted to absorb 6.00 *102 kJ of energy?

Accepted Answer

A)   2.77 mol
B)   4.93 mol
C)   3.32 mol
D)   7.40 mol
E)   14.8 molF) A) and D)
G) A) and C)

Question 7

The change in enthalpy equals heat at _____.

Accepted Answer

A)   absolute temperature
B)   constant pressure
C)   consistent volume
D)   constant length
E)   constant massF) A) and B)
G) D) and E)

Question 8

Given the thermochemical equation.
N2+ 2O2 → 2NO2 ∆H = -114.1 kJ
The enthalpy of formation of NO 2 is -114.1 kJ.

Accepted Answer

A) True 
 B)False

Question 9

_____ is defined as the heat of a process when pressure is held constant.

Accepted Answer

The answer of _____ is defined as the heat of...

Question 10

_____ is the transfer of energy from one body to another due to a difference in temperature.

Accepted Answer

A)   Flux
B)   Enthalpy
C)   Magnetism
D)   Entropy
E)   HeatF) None of the above
G) A) and D)

Question 11

Describe systems and isolated systems. Provide examples.

Accepted Answer

A system is defined as the part of the u...

Question 12

What is the work performed when a gas expands from 56.00 mL to 83.00 mL against an external pressure of 760.0 torr? Express the final answer in joules.

Accepted Answer

A)   -10.52 J
B)   -20.52 J
C)   -3.900 J
D)   - 2.736 J
E)   -8.900 JF) A) and E)
G) B) and C)

Question 13

_____ is the transfer of energy from one body to another due to a difference in temperature.

Accepted Answer

The answer of _____ is the transfer of energy from...

Question 14

Na + ½ Cl2 → NaCl. This equation is an example of a formation reaction in the standard state.

Accepted Answer

A) True 
 B)False

Question 15

How would ΔH of a reaction change if the multiples of a chemical reaction are changed? Explain with an example.

Accepted Answer

If a multiple of a chemical reaction is ...

Question 16

Consider the thermochemical equation 2C2H6(g)  + 7O2(g)  → 4CO2(g)  + 6H2O(ℓ) ; ΔH = -3,120 kJ
What amount of oxygen can consume 6,240 kJ of energy? (Molar masses: C2H6 = 30.0 g; O2 = 32.0 g) ?

Accepted Answer

A)   6.40 *102 g
B)   1.28 * 102 g
C)   2.24 *102 g
D)   3.20 *102 g
E)   4.48 * 102 gF) A) and B)
G) C) and D)

Exam 7: Energy and Chemistry

How would ΔH of a reaction change if the multiples of a chemical reaction are changed? Explain with an example.

Correct Answer
verified
If a multiple of a chemical reaction is ...
View Answer

Consider the thermochemical equation: N₂ + O₂ → 2NO; ΔH = +180.6 kJ How many moles of nitrogen should be reacted to absorb 6.00 *10² kJ of energy?

Correct Answer
verified

A chemical equation that includes an enthalpy change is called a(n) _____.

Correct Answer
verified

Given the thermochemical equation. N₂(g) + O₂(g) → 2NO(g) ΔH = +180.6 kJ If 7.00g of N₂ will be reacted, 45.2 kJ will be added. (Molar masses: N = 14 g; O = 16 g)

Correct Answer
verified

Describe systems and isolated systems. Provide examples.

Correct Answer
verified
A system is defined as the part of the u...
View Answer

_____ refers to the heat of a process when pressure is held constant.

Correct Answer
verified

_____ is defined as the heat of a process when pressure is held constant.

Correct Answer
verified

Na + ½ Cl₂ → NaCl. This equation is an example of a formation reaction in the standard state.

Correct Answer
verified

Given the thermochemical equation. N₂+ 2O₂ → 2NO₂ ∆H = -114.1 kJ The enthalpy of formation of NO ₂ is -114.1 kJ.

Correct Answer
verified

_____ is the transfer of energy from one body to another due to a difference in temperature.

Correct Answer
verified

_____ is the transfer of energy from one body to another due to a difference in temperature.

Correct Answer
verified

Consider the thermochemical equation 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(ℓ) ; ΔH = -3,120 kJ What amount of oxygen can consume 6,240 kJ of energy? (Molar masses: C₂H₆ = 30.0 g; O₂ = 32.0 g) ?

Correct Answer
verified

What is the work performed when a gas expands from 56.00 mL to 83.00 mL against an external pressure of 760.0 torr? Express the final answer in joules.

Correct Answer
verified

What is the work performed by a gas, if it expands from 5.00 L to 15.0 L against a constant external pressure of 1.62 atm? Express the final answer in joules.

Correct Answer
verified

The change in enthalpy equals heat at _____.

Correct Answer
verified

Given the equations A + 6B → 4E ΔH = −234 kJ 2B +4C → 2E ΔH = −100 kJ What is the ΔH for the reaction A + 2B → 8C?

Correct Answer
verified

Exam 7: Energy and Chemistry

How would ΔH of a reaction change if the multiples of a chemical reaction are changed? Explain with an example.

Correct AnswerverifiedIf a multiple of a chemical reaction is ...View AnswerShow Answer

Consider the thermochemical equation: N2 + O2 → 2NO; ΔH = +180.6 kJ How many moles of nitrogen should be reacted to absorb 6.00 *102 kJ of energy?

Correct AnswerverifiedShow Answer

A chemical equation that includes an enthalpy change is called a(n) _____.

Correct AnswerverifiedShow Answer

Given the thermochemical equation. N2(g) + O2(g) → 2NO(g) ΔH = +180.6 kJ If 7.00g of N2 will be reacted, 45.2 kJ will be added. (Molar masses: N = 14 g; O = 16 g)

Correct AnswerverifiedShow Answer

Describe systems and isolated systems. Provide examples.

Correct AnswerverifiedA system is defined as the part of the u...View AnswerShow Answer

_____ refers to the heat of a process when pressure is held constant.

Correct AnswerverifiedShow Answer

_____ is defined as the heat of a process when pressure is held constant.

Correct AnswerverifiedShow Answer

Na + ½ Cl2 → NaCl. This equation is an example of a formation reaction in the standard state.

Correct AnswerverifiedShow Answer

Given the thermochemical equation. N2+ 2O2 → 2NO2 ∆H = -114.1 kJ The enthalpy of formation of NO 2 is -114.1 kJ.

Correct AnswerverifiedShow Answer

_____ is the transfer of energy from one body to another due to a difference in temperature.

Correct AnswerverifiedShow Answer

_____ is the transfer of energy from one body to another due to a difference in temperature.

Correct AnswerverifiedShow Answer

Consider the thermochemical equation 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(ℓ) ; ΔH = -3,120 kJ What amount of oxygen can consume 6,240 kJ of energy? (Molar masses: C2H6 = 30.0 g; O2 = 32.0 g) ?

Correct AnswerverifiedShow Answer

What is the work performed when a gas expands from 56.00 mL to 83.00 mL against an external pressure of 760.0 torr? Express the final answer in joules.

Correct AnswerverifiedShow Answer

What is the work performed by a gas, if it expands from 5.00 L to 15.0 L against a constant external pressure of 1.62 atm? Express the final answer in joules.

Correct AnswerverifiedShow Answer

The change in enthalpy equals heat at _____.

Correct AnswerverifiedShow Answer

Given the equations A + 6B → 4E ΔH = −234 kJ 2B +4C → 2E ΔH = −100 kJ What is the ΔH for the reaction A + 2B → 8C?

Correct AnswerverifiedShow Answer

Correct Answer
verified
If a multiple of a chemical reaction is ...
View Answer

Consider the thermochemical equation: N₂ + O₂ → 2NO; ΔH = +180.6 kJ How many moles of nitrogen should be reacted to absorb 6.00 *10² kJ of energy?

Correct Answer
verified

Correct Answer
verified

Given the thermochemical equation. N₂(g) + O₂(g) → 2NO(g) ΔH = +180.6 kJ If 7.00g of N₂ will be reacted, 45.2 kJ will be added. (Molar masses: N = 14 g; O = 16 g)

Correct Answer
verified

Correct Answer
verified
A system is defined as the part of the u...
View Answer

Correct Answer
verified

Correct Answer
verified

Na + ½ Cl₂ → NaCl. This equation is an example of a formation reaction in the standard state.

Correct Answer
verified

Given the thermochemical equation. N₂+ 2O₂ → 2NO₂ ∆H = -114.1 kJ The enthalpy of formation of NO ₂ is -114.1 kJ.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Consider the thermochemical equation 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(ℓ) ; ΔH = -3,120 kJ What amount of oxygen can consume 6,240 kJ of energy? (Molar masses: C₂H₆ = 30.0 g; O₂ = 32.0 g) ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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