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

Question 10

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?

Accepted Answer

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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 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

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

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.