Question 1

The energy of motion is

Accepted Answer

A) electrical energy. 
B) dam energy. 
C) reserve energy. 
D) kinetic energy. 
A) electrical energy. 
B) dam energy. 
C) reserve energy. 
D) kinetic energy.

Question 2

Reactant R reacts with reactant S in two steps to yield product Z.  
-Step (2)in the reaction is represented by

Accepted Answer

A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line E. 
A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line E.

Question 3

Under thermodynamic standard state conditions the element oxygen occurs as

Accepted Answer

A) O(g) 
B) O2(g) 
C) O2(l) 
D) O3(g) 
A) O(g) 
B) O2(g) 
C) O2(l) 
D) O3(g)

Question 4

The intermediate,T,+ S is represented by

Accepted Answer

A) arrow C. 
B) line D. 
C) line E. 
D) line F. 
A) arrow C. 
B) line D. 
C) line E. 
D) line F.

Question 5

Which of the following states the first law of thermodynamics (conservation of energy)?

Accepted Answer

A) w = -PΔV 
B) ΔEsystem = -ΔEsurroundings 
C) ΔH = ΔE + PΔV 
D) q = smΔT 
A) w = -PΔV 
B) ΔEsystem = -ΔEsurroundings 
C) ΔH = ΔE + PΔV 
D) q = smΔT

Question 6

Which of the following is not a type of energy or energy transfer?

Accepted Answer

A) thermal energy 
B) heat 
C) height 
D) work 
A) thermal energy 
B) heat 
C) height 
D) work

Question 7

At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

Accepted Answer

A) H2. 
B) Kr. 
C) Cl2. 
D) All have the same average velocity. 
A) H2. 
B) Kr. 
C) Cl2. 
D) All have the same average velocity.

Question 8

________ energy is the kinetic energy of molecular motion.

Accepted Answer

The answer of ________ energy is the kinetic energy of...

Question 9

The enthalpy of fusion of naphthalene,C10H8,is 19.1 kJ/mol at 78.2°C,its melting point.Calculate the entropy of fusion at the melting point.

Accepted Answer

A) ΔS°fus = 244 J/(K ∙ mol) 
B) ΔS°fus = 54.4 J/(K ∙ mol) 
C) ΔS°fus = 1.49 J/(K ∙ mol) 
D) ΔS°fus = -1.49 J/(K ∙ mol) 
A) ΔS°fus = 244 J/(K ∙ mol) 
B) ΔS°fus = 54.4 J/(K ∙ mol) 
C) ΔS°fus = 1.49 J/(K ∙ mol) 
D) ΔS°fus = -1.49 J/(K ∙ mol)

Question 10

The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 20.00 g of steam condenses to liquid water at 100°C.

Accepted Answer

A) 45.2 kJ of heat are absorbed. 
B) 45.2 kJ of heat are released. 
C) 813.2 kJ of heat are absorbed. 
D) 813.2 kJ of heat are released. 
A) 45.2 kJ of heat are absorbed. 
B) 45.2 kJ of heat are released. 
C) 813.2 kJ of heat are absorbed. 
D) 813.2 kJ of heat are released.

Question 11

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant ________ and is expressed as ΔH when heat is transferred under constant ________ conditions.

Accepted Answer

The answer of Heat transferred in a chemical reaction or...

Question 12

Reactant R reacts with reactant S in two steps to yield product Z.  
-Step (1)in the reaction is represented by

Accepted Answer

A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line E. 
A) arrow A. 
B) arrow B. 
C) arrow C. 
D) line E.

Question 13

Kinetic energy increases with increasing ________ and increasing ________.

Accepted Answer

The answer of Kinetic energy increases with increasing ________ and...

Question 14

For the reaction,N H3(g)→ N(g)+ 3 H(g),one would expect

Accepted Answer

A) ΔH° to be negative and ΔS° to be negative. 
B) ΔH° to be negative and ΔS° to be positive. 
C) ΔH° to be positive and ΔS° to be negative. 
D) ΔH° to be positive and ΔS° to be positive. 
A) ΔH° to be negative and ΔS° to be negative. 
B) ΔH° to be negative and ΔS° to be positive. 
C) ΔH° to be positive and ΔS° to be negative. 
D) ΔH° to be positive and ΔS° to be positive.

Question 15

How much heat is absorbed/released when 20.00 g of NH3(g)reacts in the presence of excess   (g)to produce NO(g)and H2O(l)according to the following chemical equation? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(l)ΔH° = 1168 kJ

Accepted Answer

A) 342.9 kJ of heat are absorbed. 
B) 342.9 kJ of heat are released. 
C) 1372 kJ of heat are absorbed. 
D) 1372 kJ of heat are released. 
A) 342.9 kJ of heat are absorbed. 
B) 342.9 kJ of heat are released. 
C) 1372 kJ of heat are absorbed. 
D) 1372 kJ of heat are released.

Question 16

What are the signs of ΔH,ΔS,and ΔG for the following spontaneous change?

Accepted Answer

A) ΔH = +,ΔS = +,ΔG = - 
B) ΔH = +,ΔS = -,ΔG = - 
C) ΔH = -,ΔS = +,ΔG = - 
D) ΔH = -,ΔS = -,ΔG = - 
A) ΔH = +,ΔS = +,ΔG = - 
B) ΔH = +,ΔS = -,ΔG = - 
C) ΔH = -,ΔS = +,ΔG = - 
D) ΔH = -,ΔS = -,ΔG = -

Question 17

Water has an unusually high

Accepted Answer

A) electrical conductivity. 
B) heat of combustion. 
C) heat of formation. 
D) specific heat. 
A) electrical conductivity. 
B) heat of combustion. 
C) heat of formation. 
D) specific heat.

Question 18

If an endothermic reaction is spontaneous at constant temperature and pressure,

Accepted Answer

A) ΔG is negative and ΔS may be positive or negative. 
B) ΔG is negative and ΔS is positive. 
C) ΔG is positive and ΔS is negative. 
D) ΔG is positive and ΔS may be positive or negative. 
A) ΔG is negative and ΔS may be positive or negative. 
B) ΔG is negative and ΔS is positive. 
C) ΔG is positive and ΔS is negative. 
D) ΔG is positive and ΔS may be positive or negative.

Question 19

For the reaction,C2H2(g)→ 2 C(g)+ 2 H(g),one would expect

Accepted Answer

A) ΔH° to be negative and ΔS° to be negative. 
B) ΔH° to be negative and ΔS° to be positive. 
C) ΔH° to be positive and ΔS° to be negative. 
D) ΔH° to be positive and ΔS° to be positive. 
A) ΔH° to be negative and ΔS° to be negative. 
B) ΔH° to be negative and ΔS° to be positive. 
C) ΔH° to be positive and ΔS° to be negative. 
D) ΔH° to be positive and ΔS° to be positive.

Question 20

Which thermodynamic function is most related to disorder and probability?

Accepted Answer

A) enthalpy 
B) internal energy 
C) entropy 
D) heat capacity 
A) enthalpy 
B) internal energy 
C) entropy 
D) heat capacity

Exam 9: Thermochemistry: Chemical Energy

The energy of motion is

Reactant R reacts with reactant S in two steps to yield product Z. -Step (2)in the reaction is represented by

Under thermodynamic standard state conditions the element oxygen occurs as

The intermediate,T,+ S is represented by

Which of the following states the first law of thermodynamics (conservation of energy)?

Which of the following is not a type of energy or energy transfer?

At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

________ energy is the kinetic energy of molecular motion.

The enthalpy of fusion of naphthalene,C10H8,is 19.1 kJ/mol at 78.2°C,its melting point.Calculate the entropy of fusion at the melting point.

The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 20.00 g of steam condenses to liquid water at 100°C.

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant ________ and is expressed as ΔH when heat is transferred under constant ________ conditions.

Reactant R reacts with reactant S in two steps to yield product Z. -Step (1)in the reaction is represented by

Kinetic energy increases with increasing ________ and increasing ________.

For the reaction,N H3(g)→ N(g)+ 3 H(g),one would expect

How much heat is absorbed/released when 20.00 g of NH3(g)reacts in the presence of excess (g)to produce NO(g)and H2O(l)according to the following chemical equation? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(l)ΔH° = 1168 kJ

What are the signs of ΔH,ΔS,and ΔG for the following spontaneous change?

Water has an unusually high

If an endothermic reaction is spontaneous at constant temperature and pressure,

For the reaction,C2H2(g)→ 2 C(g)+ 2 H(g),one would expect

Which thermodynamic function is most related to disorder and probability?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

At 298 K the average kinetic energy is the same for H₂,He,and N₂.The gas with the highest average velocity is

The enthalpy of fusion of naphthalene,C₁₀H₈,is 19.1 kJ/mol at 78.2°C,its melting point.Calculate the entropy of fusion at the melting point.

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant and is expressed as ΔH when heat is transferred under constant conditions.

Kinetic energy increases with increasing and increasing .

For the reaction,NH₃(g)→ N(g)+ 3 H(g),one would expect

How much heat is absorbed/released when 20.00 g of NH₃(g)reacts in the presence of excess (g)to produce NO(g)and H₂O(l)according to the following chemical equation? 4 NH₃(g)+ 5 O₂(g)→ 4 NO(g)+ 6 H₂O(l)ΔH° = 1168 kJ

For the reaction,C₂H₂(g)→ 2 C(g)+ 2 H(g),one would expect