Question 1

A 22.9 g sample of iron absorbs 155 J of heat,upon which the temperature of the sample increases from   to   What is the specific heat of iron?

Accepted Answer

A) 0.451 J/g-K 
B) -0.451 J/g-K 
C) 237 J/g-K 
D) 102 J/g-K 
E) 53,200 J/g-K 
A) 0.451 J/g-K 
B) -0.451 J/g-K 
C) 237 J/g-K 
D) 102 J/g-K 
E) 53,200 J/g-K

Question 2

A 5.00-g sample of copper metal at 25.0 °C is heated by the addition of 133 J of energy.The final temperature of the copper is ________ °C.The specific heat capacity of copper is

Accepted Answer

A) 35.1 
B) 25.0 
C) 45.0 
D) 95.0 
E) 70.0 
A) 35.1 
B) 25.0 
C) 45.0 
D) 95.0 
E) 70.0

Question 3

What is the kinetic energy of a 55.2 g object moving at 135 m/s.

Accepted Answer

A) 503 J 
B) 5.03 × 105 J 
C) 1.01 × 103 J 
D) 3.73 J 
E) 3.73 × 103 J 
A) 503 J 
B) 5.03 × 105 J 
C) 1.01 × 103 J 
D) 3.73 J 
E) 3.73 × 103 J

Question 4

Calculate the work (kJ)done during a reaction in which the internal volume expands from   to   against a vacuum (an outside pressure of

Accepted Answer

A) 0; kJ No work is done. 
B) 3.6 kJ 
C) -3.6 kJ 
D) 6.5 kJ 
E) -6.5 kJ 
A) 0; kJ No work is done. 
B) 3.6 kJ 
C) -3.6 kJ 
D) 6.5 kJ 
E) -6.5 kJ

Question 5

Given the data in the table below,ΔH°rxn for the reaction 4NH3 (g)+ 5O2 (g)→ 4NO (g)+ 6H2O (l)
Is ________ kJ.

Accepted Answer

A) -1172 
B) -150 
C) -1540 
D) -1892 
E) The ΔH°f of O2 (g)is needed for the calculation. 
A) -1172 
B) -150 
C) -1540 
D) -1892 
E) The ΔH°f of O2 (g)is needed for the calculation.

Question 6

Objects can possess energy as ________. (a)endothermic energy
(b)potential energy
(c)kinetic energy

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

Question 7

For the following reactions,the ΔH°rxn is NOT equal to ΔH°f for the product except for ________.

Accepted Answer

A) CH4 (g)+ 2Cl2 (g)→ CH2Cl2 (l)+ 2HCl (g) 
B) N2 (g)+ O3 (g)→ N2O3 (g) 
C) Xe (g)+ 2F2 (g)→ XeF4 (g) 
D) 2CO (g)+ O2 (g)→ 2CO2 (g) 
E) C (diamond)+ O2 (g)→ CO2 (g) 
A) CH4 (g)+ 2Cl2 (g)→ CH2Cl2 (l)+ 2HCl (g) 
B) N2 (g)+ O3 (g)→ N2O3 (g) 
C) Xe (g)+ 2F2 (g)→ XeF4 (g) 
D) 2CO (g)+ O2 (g)→ 2CO2 (g) 
E) C (diamond)+ O2 (g)→ CO2 (g)

Question 8

For the following reactions,the ΔH°rxn is NOT equal to ΔH°f for the product except for ________.

Accepted Answer

A) H2O (l)+ 1/2O2 (g)→ H2O2 (l) 
B) N2 (g)+ O2 (g)→ 2NO (g) 
C) 2H2 (g)+ O2 (g)→ 2H2O (l) 
D) 2H2 (g)+ O2 (g)→ 2H2O (g) 
E) none of the above 
A) H2O (l)+ 1/2O2 (g)→ H2O2 (l) 
B) N2 (g)+ O2 (g)→ 2NO (g) 
C) 2H2 (g)+ O2 (g)→ 2H2O (l) 
D) 2H2 (g)+ O2 (g)→ 2H2O (g) 
E) none of the above

Question 9

Which one of the following conditions would always result in an increase in the internal energy of a system?

Accepted Answer

A) The system loses heat and does work on the surroundings. 
B) The system gains heat and does work on the surroundings. 
C) The system loses heat and has work done on it by the surroundings. 
D) The system gains heat and has work done on it by the surroundings. 
E) None of the above is correct. 
A) The system loses heat and does work on the surroundings. 
B) The system gains heat and does work on the surroundings. 
C) The system loses heat and has work done on it by the surroundings. 
D) The system gains heat and has work done on it by the surroundings. 
E) None of the above is correct.

Question 10

A slice of cake contains 29.0 grams of fat,9.0 grams of protein,and 77 grams of carbohydrate.If swimming burns 1000.0 kJ/hour,how many minutes would it take to completely burn off the slice of cake? The respective fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.

Accepted Answer

A) 154 
B) 2.56 
C) 23.4 
D) 117 
E) 262 
A) 154 
B) 2.56 
C) 23.4 
D) 117 
E) 262

Question 11

A 4.50-g sample of liquid water at 25.0 °C is heated by the addition of 133 J of energy.The final temperature of the water is ________ °C.The specific heat capacity of liquid water is

Accepted Answer

A) 149 
B) 25.1 
C) -17.9 
D) 32.1 
E) 7.07 
A) 149 
B) 25.1 
C) -17.9 
D) 32.1 
E) 7.07

Question 12

The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is ________ J.

Accepted Answer

A) 1900 
B) 77.8 
C) 145 
D) 1.43 × 10-3 
E) 6.00 
A) 1900 
B) 77.8 
C) 145 
D) 1.43 × 10-3 
E) 6.00

Question 13

A 10.1 g sample of NaOH is dissolved in 250.0 g of water in a coffee-cup calorimeter.The temperature increases from 23.0 °C to ________°C.Specific heat of liquid water is 4.18 J/g-K and ΔH for the dissolution of sodium hydroxide in water is 44.4 kJ/mol.

Accepted Answer

A) 35.2 
B) 24.0 
C) 33.7 
D) 33.3 
E) 40.2 
A) 35.2 
B) 24.0 
C) 33.7 
D) 33.3 
E) 40.2

Question 14

Given the following reactions CaCO3 (s)→ CaO (s)+ CO2 (g)ΔH = 178.1 kJ
C (s,graphite)+ O2(g)→ CO2(g)ΔH = -393.5 kJ
The enthalpy of the reaction
CaCO3 (s)→ CaO (s)+ C (s,graphite)+ O2 (g)
Is ________ kJ.

Accepted Answer

A) 215.4 
B) 571.6 
C) -215.4 
D) -571.6 
E) 7.01 × 104 
A) 215.4 
B) 571.6 
C) -215.4 
D) -571.6 
E) 7.01 × 104

Question 15

Fuel values of hydrocarbons increase as the ________ increases.

Accepted Answer

A) C atomic ratio 
B) H/C atomic ratio 
C) H atomic ratio 
D) C/C atomic ratio 
E) C/H atomic ratio 
A) C atomic ratio 
B) H/C atomic ratio 
C) H atomic ratio 
D) C/C atomic ratio 
E) C/H atomic ratio

Question 16

What is the enthalpy change (in kJ)of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25 g/mL by 3.33 °C? (The specific heat of the solution is 3.74 J/g-K.)

Accepted Answer

A) -7.43 kJ 
B) -12.51 kJ 
C) 8.20 kJ 
D) -3.89 kJ 
E) 6.51 kJ 
A) -7.43 kJ 
B) -12.51 kJ 
C) 8.20 kJ 
D) -3.89 kJ 
E) 6.51 kJ

Question 17

For which one of the following reactions is ΔH°rxn equal to the heat of formation of the product?

Accepted Answer

A) N2 (g)+ 3H2 (g)→ 2NH3 (g) 
B) (1/2)N2 (g)+ O2 (g)→ NO2(g) 
C) 6C (s)+ 6H (g)→ C6H6 (l) 
D) P (g)+ 4H (g)+ Br (g)→ PH4Br (l) 
E) 12C (g)+ 11H2 (g)+ 11O (g)→ C6H22O11 (g) 
A) N2 (g)+ 3H2 (g)→ 2NH3 (g) 
B) (1/2)N2 (g)+ O2 (g)→ NO2(g) 
C) 6C (s)+ 6H (g)→ C6H6 (l) 
D) P (g)+ 4H (g)+ Br (g)→ PH4Br (l) 
E) 12C (g)+ 11H2 (g)+ 11O (g)→ C6H22O11 (g)

Question 18

The reaction 4Al (s)+ 3O2 (g)→ 2 Al2O3 (s)ΔH° = -3351 kJ
Is ________,and therefore heat is ________ by the reaction.

Accepted Answer

A) endothermic, released 
B) endothermic, absorbed 
C) exothermic, released 
D) exothermic, absorbed 
E) thermoneutral, neither released nor absorbed 
A) endothermic, released 
B) endothermic, absorbed 
C) exothermic, released 
D) exothermic, absorbed 
E) thermoneutral, neither released nor absorbed

Question 19

Of the following,ΔH°f is not zero for ________.

Accepted Answer

A) O2 (g) 
B) C (graphite) 
C) N2 (g) 
D) F2 (s) 
E) Cl2 (g) 
A) O2 (g) 
B) C (graphite) 
C) N2 (g) 
D) F2 (s) 
E) Cl2 (g)

Question 20

Given the following reactions 2NO → N2 + O2 ΔH = -180 kJ
2NO + O2 → 2NO2 ΔH = -112 kJ
The enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide
N2 + 2O2 → 2NO2
Is ________ kJ.

Accepted Answer

A) 68 
B) -68 
C) -292 
D) 292 
E) -146 
A) 68 
B) -68 
C) -292 
D) 292 
E) -146

Exam 5: Thermochemistry

A 22.9 g sample of iron absorbs 155 J of heat,upon which the temperature of the sample increases from to What is the specific heat of iron?

A 5.00-g sample of copper metal at 25.0 °C is heated by the addition of 133 J of energy.The final temperature of the copper is ________ °C.The specific heat capacity of copper is

What is the kinetic energy of a 55.2 g object moving at 135 m/s.

Calculate the work (kJ)done during a reaction in which the internal volume expands from to against a vacuum (an outside pressure of

Given the data in the table below,ΔH°rxn for the reaction 4NH3 (g)+ 5O2 (g)→ 4NO (g)+ 6H2O (l) Is ________ kJ.

Objects can possess energy as ________. (a)endothermic energy (b)potential energy (c)kinetic energy

For the following reactions,the ΔH°rxn is NOT equal to ΔH°f for the product except for ________.

For the following reactions,the ΔH°rxn is NOT equal to ΔH°f for the product except for ________.

Which one of the following conditions would always result in an increase in the internal energy of a system?

A slice of cake contains 29.0 grams of fat,9.0 grams of protein,and 77 grams of carbohydrate.If swimming burns 1000.0 kJ/hour,how many minutes would it take to completely burn off the slice of cake? The respective fuel values for protein,fat,and carbohydrate are 17,38,and 17 kJ/g,respectively.

A 4.50-g sample of liquid water at 25.0 °C is heated by the addition of 133 J of energy.The final temperature of the water is ________ °C.The specific heat capacity of liquid water is

The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is ________ J.

A 10.1 g sample of NaOH is dissolved in 250.0 g of water in a coffee-cup calorimeter.The temperature increases from 23.0 °C to ________°C.Specific heat of liquid water is 4.18 J/g-K and ΔH for the dissolution of sodium hydroxide in water is 44.4 kJ/mol.

Given the following reactions CaCO3 (s)→ CaO (s)+ CO2 (g)ΔH = 178.1 kJ C (s,graphite)+ O2(g)→ CO2(g)ΔH = -393.5 kJ The enthalpy of the reaction CaCO3 (s)→ CaO (s)+ C (s,graphite)+ O2 (g) Is ________ kJ.

Fuel values of hydrocarbons increase as the ________ increases.

What is the enthalpy change (in kJ)of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25 g/mL by 3.33 °C? (The specific heat of the solution is 3.74 J/g-K.)

For which one of the following reactions is ΔH°rxn equal to the heat of formation of the product?

The reaction 4Al (s)+ 3O2 (g)→ 2 Al2O3 (s)ΔH° = -3351 kJ Is ________,and therefore heat is ________ by the reaction.

Of the following,ΔH°f is not zero for ________.

Given the following reactions 2NO → N2 + O2 ΔH = -180 kJ 2NO + O2 → 2NO2 ΔH = -112 kJ The enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide N2 + 2O2 → 2NO2 Is ________ kJ.

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 4NH₃ (g)+ 5O₂ (g)→ 4NO (g)+ 6H₂O (l) Is ________ kJ.

For the following reactions,the ΔH°_rxn is NOT equal to ΔH°_f for the product except for ________.

For the following reactions,the ΔH°_rxn is NOT equal to ΔH°_f for the product except for ________.

Given the following reactions CaCO₃ (s)→ CaO (s)+ CO₂ (g)ΔH = 178.1 kJ C (s,graphite)+ O₂(g)→ CO₂(g)ΔH = -393.5 kJ The enthalpy of the reaction CaCO₃ (s)→ CaO (s)+ C (s,graphite)+ O₂ (g) Is ________ kJ.

For which one of the following reactions is ΔH°_rxn equal to the heat of formation of the product?

The reaction 4Al (s)+ 3O₂ (g)→ 2 Al₂O₃ (s)ΔH° = -3351 kJ Is ,and therefore heat is by the reaction.

Of the following,ΔH°_f is not zero for ________.

Given the following reactions 2NO → N₂ + O₂ ΔH = -180 kJ 2NO + O₂ → 2NO₂ ΔH = -112 kJ The enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide N₂ + 2O₂ → 2NO₂ Is ________ kJ.