Question 1

Which of the following is a statement of the first law of thermodynamics?

Accepted Answer

A) Ek =  mv2 
B) A negative ΔH corresponds to an exothermic process. 
C) ΔE = Efinal - Einitial 
D) Energy lost by the system must be gained by the surroundings. 
E) 1 cal = 4.184 J (exactly)

Question 2

Given the data in the table below,ΔH°rxn for the reaction C2H5OH (l)+ O2 (g)→ CH3CO2H (l)+ H2O (l)
Is ________ kJ.

Accepted Answer

A) -79.0 
B) -1048.0 
C) -476.4 
D) -492.6 
E) The value of ΔH°f of O2 (g)is required for the calculation.

Question 3

Given the data in the table below,ΔH°rxn for the reaction Ca(OH)2 + 2H3AsO4 → Ca(H2AsO4)2 + 2H2O
Is ________ kJ.

Accepted Answer

A) -744.9 
B) -4519 
C) -4219 
D) -130.4 
E) -76.4

Question 4

How many kJ of heat are released when 15.75 g of Ba (s)reacts completely with oxygen gas to form BaO (s)? ΔH° = -1107 kJ.

Accepted Answer

A) 63.5 kJ 
B) 20.8 kJ 
C) 114 kJ 
D) 70.3 kJ 
E) 35.1 kJ

Question 5

________ yields the highest fuel value.

Accepted Answer

A) hydrogen 
B) charcoal 
C) bituminous coal 
D) natural gas 
E) wood

Question 6

Hydrogen peroxide decomposes to water and oxygen at constant pressure (△H = -196 kJ). What is the value of q (kJ)for this reaction when 4.60 g of hydrogen peroxide decomposes at constant pressure?

Accepted Answer

A) -26.5 kJ 
B) -0.0189 kJ 
C) 1.25 kJ 
D) -2.65 × 104 kJ 
E) -13.3 kJ

Question 7

ΔH for the reaction IF5 (g)→ IF3 (g)+ F2 (g)
Is ________ kJ,give the data below.
IF (g)+ F2 (g)→ IF3 (g)ΔH = -390 kJ
IF (g)+ 2F2 (g)→ IF5 (g)ΔH = -745 kJ

Accepted Answer

A) +355 
B) -1135 
C) +1135 
D) +35 
E) -35

Question 8

Coal contains hydrocarbons of high molecular weight as well as compounds containing ________,sulfur,or nitrogen.

Accepted Answer

The answer of Coal contains hydrocarbons of high molecular weight...

Question 9

An 8 oz.bottle of energy drink contains 6.0 g of protein,2.0 g of fat,and 16.3 g of carbohydrate.The fuel value of this energy drink bottle is ________ kJ.The fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.

Accepted Answer

A) 520 
B) 280 
C) 720 
D) 460 
E) 72

Question 10

The ΔH_rxnfor the combustion of methane is -890.0 kJ.How much heat energy (kJ)is released if 82.1 grams of methane are burned in an excess amount of oxygen?

Accepted Answer

The answer of The ΔH_rxnfor the combustion of methane...

Question 11

The specific heat capacity of liquid water is 4.18 J/g-K.How many joules of heat are needed to raise the temperature of 7.25 g of water from 20.0 °C to 44.1 °C?

Accepted Answer

A) 41.8 J 
B) 730 J 
C) 1.94 ×  J 
D) 2.39 ×  J 
E) 66.8 J

Question 12

The specific heat capacity of lead is 0.13 J/g-K.How much heat (in J)is required to raise the temperature of  of lead from 22 °C to 37 °C?

Accepted Answer

A) 2.0 J 
B) -0.13 J 
C) 5.8 × 10-4 J 
D) 29 J 
E) 0.13 J

Question 13

The most abundant fossil fuel is ________.

Accepted Answer

A) natural gas 
B) petroleum 
C) coal 
D) uranium 
E) hydrogen

Question 14

The value of ΔH° for the reaction below is -186 kJ. H2 (g)+ Cl2 (g)→ 2HCl (g)
The value of ΔH°f for HCl (g)is ________ kJ/mol.

Accepted Answer

A) -3.72 × 102 
B) -1.27 × 102 
C) -93.0 
D) -186 
E) +186

Question 15

Given the following reactions N2 (g)+ O2 (g)→ 2NO (g)ΔH = +180.7 kJ
2NO( g)+ O2 (g)→ 2NO2 (g)ΔH = -113.1 kJ
The enthalpy for the decomposition of nitrogen dioxide into molecular nitrogen and oxygen
2NO2 (g)→ N2 (g)+ 2O2 (g)
Is ________ kJ.

Accepted Answer

A) 67.6 
B) -67.6 
C) 293.8 
D) -293.8 
E) 45.5

Question 16

Carbon monoxide and oxygen gas react to form carbon dioxide.How much heat is released when 89.5 grams of O2 (g)reacts with excess CO? ΔH° = -482 kJ.

Accepted Answer

A) 1.35 × 103 kJ 
B) 2.70 × 103 kJ 
C) 1.35 × 10-3 kJ 
D) 674 kJ 
E) 4.31 × 104 kJ

Question 17

A 19.5 g candy bar contains 8% protein,33% fat,and 18% carbohydrate.The respective fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.What is the fuel value (kJ)for this piece of candy?

Accepted Answer

A) 241 
B) 331 
C) 27 
D) 60.0 
E) 17.0

Question 18

The units of specific heat are ________.

Accepted Answer

A) K/J or °C/J 
B) J/K or J/°C 
C) J/g-K or J/g-°C 
D) J/mol 
E) g-K/J or g-°C/J

Question 19

The value of ΔE for a system that performs 151 kJ of work on its surroundings and loses 79 kJ of heat is ________ kJ.

Accepted Answer

A) +230. 
B) -230. 
C) +72 
D) -72 
E) -151

Question 20

The internal energy can be increased by ________. (a)transferring heat from the surroundings to the system
(b)transferring heat from the system to the surroundings
(c)doing work on the system

Accepted Answer

A) a only 
B) b only 
C) c only 
D) a and c 
E) b and c

Exam 5: Thermochemistry

Which of the following is a statement of the first law of thermodynamics?

Given the data in the table below,ΔH°_rxn for the reaction C₂H₅OH (l) + O₂ (g) → CH₃CO₂H (l) + H₂O (l) Is ________ kJ.

Given the data in the table below,ΔH°_rxn for the reaction Ca(OH) ₂ + 2H₃AsO₄ → Ca(H₂AsO₄) ₂ + 2H₂O Is ________ kJ.

How many kJ of heat are released when 15.75 g of Ba (s) reacts completely with oxygen gas to form BaO (s) ? ΔH° = -1107 kJ.

________ yields the highest fuel value.

Hydrogen peroxide decomposes to water and oxygen at constant pressure (△H = -196 kJ) . What is the value of q (kJ) for this reaction when 4.60 g of hydrogen peroxide decomposes at constant pressure?

ΔH for the reaction IF₅ (g) → IF₃(g) + F₂(g) Is ________ kJ,give the data below. IF (g) + F₂(g) → IF₃(g) ΔH = -390 kJ IF (g) + 2F₂ (g) → IF₅ (g) ΔH = -745 kJ

Coal contains hydrocarbons of high molecular weight as well as compounds containing ________,sulfur,or nitrogen.

An 8 oz.bottle of energy drink contains 6.0 g of protein,2.0 g of fat,and 16.3 g of carbohydrate.The fuel value of this energy drink bottle is ________ kJ.The fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.

The ΔH_rxnfor the combustion of methane is -890.0 kJ.How much heat energy (kJ)is released if 82.1 grams of methane are burned in an excess amount of oxygen?

The specific heat capacity of liquid water is 4.18 J/g-K.How many joules of heat are needed to raise the temperature of 7.25 g of water from 20.0 °C to 44.1 °C?

The specific heat capacity of lead is 0.13 J/g-K.How much heat (in J) is required to raise the temperature of of lead from 22 °C to 37 °C?

The most abundant fossil fuel is ________.

The value of ΔH° for the reaction below is -186 kJ. H₂ (g) + Cl₂ (g) → 2HCl (g) The value of ΔH°_f for HCl (g) is ________ kJ/mol.

Given the following reactions N₂ (g) + O₂ (g) → 2NO (g) ΔH = +180.7 kJ 2NO( g) + O₂ (g) → 2NO₂ (g) ΔH = -113.1 kJ The enthalpy for the decomposition of nitrogen dioxide into molecular nitrogen and oxygen 2NO₂ (g) → N₂ (g) + 2O₂ (g) Is ________ kJ.

Carbon monoxide and oxygen gas react to form carbon dioxide.How much heat is released when 89.5 grams of O₂ (g) reacts with excess CO? ΔH° = -482 kJ.

A 19.5 g candy bar contains 8% protein,33% fat,and 18% carbohydrate.The respective fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.What is the fuel value (kJ) for this piece of candy?

The units of specific heat are ________.

The value of ΔE for a system that performs 151 kJ of work on its surroundings and loses 79 kJ of heat is ________ kJ.

The internal energy can be increased by ________. (a) transferring heat from the surroundings to the system (b) transferring heat from the system to the surroundings (c) doing work on the system

Exam 5: Thermochemistry

Which of the following is a statement of the first law of thermodynamics?

Given the data in the table below,ΔH°rxn for the reaction C2H5OH (l) + O2 (g) → CH3CO2H (l) + H2O (l) Is ________ kJ.

Given the data in the table below,ΔH°rxn for the reaction Ca(OH) 2 + 2H3AsO4 → Ca(H2AsO4) 2 + 2H2O Is ________ kJ.

How many kJ of heat are released when 15.75 g of Ba (s) reacts completely with oxygen gas to form BaO (s) ? ΔH° = -1107 kJ.

________ yields the highest fuel value.

Hydrogen peroxide decomposes to water and oxygen at constant pressure (△H = -196 kJ) . What is the value of q (kJ) for this reaction when 4.60 g of hydrogen peroxide decomposes at constant pressure?

ΔH for the reaction IF5 (g) → IF3 (g) + F2 (g) Is ________ kJ,give the data below. IF (g) + F2 (g) → IF3 (g) ΔH = -390 kJ IF (g) + 2F2 (g) → IF5 (g) ΔH = -745 kJ

Coal contains hydrocarbons of high molecular weight as well as compounds containing ________,sulfur,or nitrogen.

An 8 oz.bottle of energy drink contains 6.0 g of protein,2.0 g of fat,and 16.3 g of carbohydrate.The fuel value of this energy drink bottle is ________ kJ.The fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.

The ΔHrxn for the combustion of methane is -890.0 kJ.How much heat energy (kJ)is released if 82.1 grams of methane are burned in an excess amount of oxygen?

The specific heat capacity of liquid water is 4.18 J/g-K.How many joules of heat are needed to raise the temperature of 7.25 g of water from 20.0 °C to 44.1 °C?

The specific heat capacity of lead is 0.13 J/g-K.How much heat (in J) is required to raise the temperature of of lead from 22 °C to 37 °C?

The most abundant fossil fuel is ________.

The value of ΔH° for the reaction below is -186 kJ. H2 (g) + Cl2 (g) → 2HCl (g) The value of ΔH°f for HCl (g) is ________ kJ/mol.

Given the following reactions N2 (g) + O2 (g) → 2NO (g) ΔH = +180.7 kJ 2NO( g) + O2 (g) → 2NO2 (g) ΔH = -113.1 kJ The enthalpy for the decomposition of nitrogen dioxide into molecular nitrogen and oxygen 2NO2 (g) → N2 (g) + 2O2 (g) Is ________ kJ.

Carbon monoxide and oxygen gas react to form carbon dioxide.How much heat is released when 89.5 grams of O2 (g) reacts with excess CO? ΔH° = -482 kJ.

A 19.5 g candy bar contains 8% protein,33% fat,and 18% carbohydrate.The respective fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.What is the fuel value (kJ) for this piece of candy?

The units of specific heat are ________.

The value of ΔE for a system that performs 151 kJ of work on its surroundings and loses 79 kJ of heat is ________ kJ.

The internal energy can be increased by ________. (a) transferring heat from the surroundings to the system (b) transferring heat from the system to the surroundings (c) doing work on the system

Given the data in the table below,ΔH°_rxn for the reaction C₂H₅OH (l) + O₂ (g) → CH₃CO₂H (l) + H₂O (l) Is ________ kJ.

Given the data in the table below,ΔH°_rxn for the reaction Ca(OH) ₂ + 2H₃AsO₄ → Ca(H₂AsO₄) ₂ + 2H₂O Is ________ kJ.

ΔH for the reaction IF₅ (g) → IF₃(g) + F₂(g) Is ________ kJ,give the data below. IF (g) + F₂(g) → IF₃(g) ΔH = -390 kJ IF (g) + 2F₂ (g) → IF₅ (g) ΔH = -745 kJ

The ΔH_rxnfor the combustion of methane is -890.0 kJ.How much heat energy (kJ)is released if 82.1 grams of methane are burned in an excess amount of oxygen?

The value of ΔH° for the reaction below is -186 kJ. H₂ (g) + Cl₂ (g) → 2HCl (g) The value of ΔH°_f for HCl (g) is ________ kJ/mol.

Given the following reactions N₂ (g) + O₂ (g) → 2NO (g) ΔH = +180.7 kJ 2NO( g) + O₂ (g) → 2NO₂ (g) ΔH = -113.1 kJ The enthalpy for the decomposition of nitrogen dioxide into molecular nitrogen and oxygen 2NO₂ (g) → N₂ (g) + 2O₂ (g) Is ________ kJ.

Carbon monoxide and oxygen gas react to form carbon dioxide.How much heat is released when 89.5 grams of O₂ (g) reacts with excess CO? ΔH° = -482 kJ.