Question 1

At 20°C,a sample of solid spontaneously sublimes to a gas.This change in state is accompanied by which of the following changes in the solid sample?

Accepted Answer

A)  entropy & energy decrease 
B)  entropy & energy increase 
C)  entropy decreases & energy increases 
D)  energy decreases & entropy increases 
A)  entropy & energy decrease 
B)  entropy & energy increase 
C)  entropy decreases & energy increases 
D)  energy decreases & entropy increases

Question 2

Which of the following is NOT true regarding a chemical reaction?

Accepted Answer

A)  All matter is considered to be composed of tiny particles. 
B)  All particles contain potential energy,measured by constant motion. 
C)  Particle speed always increases with rising temperature. 
D)  Colliding particles will transfer energy with no loss in system energy. 
A)  All matter is considered to be composed of tiny particles. 
B)  All particles contain potential energy,measured by constant motion. 
C)  Particle speed always increases with rising temperature. 
D)  Colliding particles will transfer energy with no loss in system energy.

Question 3

The reaction represented by this energy diagram is endothermic.

Accepted Answer

A) True 
 B)False

Question 4

Which method can be used to product a timed-release medication?

Accepted Answer

A)  The patient is given the medication in small doses over time,rather than one larger dose. 
B)  The patient is to take the medication two or three times a day. 
C)  The medication is provided in special capsules that are subdivided into smaller,pulverized portions of the medicinal compound. 
D)  The medication compound is produced in very small amounts and each is coated with a material of varying thickness. 
A)  The patient is given the medication in small doses over time,rather than one larger dose. 
B)  The patient is to take the medication two or three times a day. 
C)  The medication is provided in special capsules that are subdivided into smaller,pulverized portions of the medicinal compound. 
D)  The medication compound is produced in very small amounts and each is coated with a material of varying thickness.

Question 5

Equilibrium:
The following question(s)refer to the equilibrium given below in which all reactants and products are gases.
CHS1U1B14S1U1B0 + HS1U1B12S1U1B0O   CHS1U1B13S1U1B0OH + HS1U1B12S1U1B0 + heat
Indicate the effect of the changing condition on the position of equilibrium.
-Refer to Equilibrium.Remove H2 from the mixture.

Accepted Answer

A)  shifts left 
B)  shifts right 
C)  no effect 
D)  can shift to right or left 
A)  shifts left 
B)  shifts right 
C)  no effect 
D)  can shift to right or left

Question 6

The reaction below does not progress at room temperature,but does at 1100S1U1P1$\circ$S1S1P0C.Therefore,this reaction is spontaneous at 1100S1U1P1$\circ$S1S1P0C.

Accepted Answer

A) True 
 B)False

Question 7

Reaction rates are determined experimentally.

Accepted Answer

A) True 
 B)False

Question 8

In a system of equilibrium,it is true that the rate of the forward reaction

Accepted Answer

A)  exceeds that of the reverse. 
B)  is lower than that of the reverse reaction. 
C)  is equal to the rate of the reverse reaction. 
D)  More than one response is correct. 
A)  exceeds that of the reverse. 
B)  is lower than that of the reverse reaction. 
C)  is equal to the rate of the reverse reaction. 
D)  More than one response is correct.

Question 9

Consider the following energy diagram.Which letter represents the activation energy for the forward reaction?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 10

Catalytic action is

Accepted Answer

A)  responsible for speeding up and slowing down chemical reactions. 
B)  directly opposed by inhibitors. 
C)  much more effective at room temperature than higher temperature. 
D)  there is more than one correct response. 
A)  responsible for speeding up and slowing down chemical reactions. 
B)  directly opposed by inhibitors. 
C)  much more effective at room temperature than higher temperature. 
D)  there is more than one correct response.

Question 11

A spontaneous process accompanied by an entropy decrease must also be accompanied by an energy decrease.

Accepted Answer

A) True 
 B)False

Question 12

BrCl is put into an empty 1.00 L container.At equilibrium,the molar concentration of BrCl is 0.382,and that of Br2 is 0.319.Evaluate the equilibrium constant for the following reaction.
Br2(g)+ Cl2(g)  
2BrCl(g)

Accepted Answer

A)  0.457 
B)  0.699 
C)  1.43 
D)  5.74 
A)  0.457 
B)  0.699 
C)  1.43 
D)  5.74

Question 13

For the following energy diagram,which letter represents the catalyzed activation energy?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 14

Most automobiles function by burning gasoline by a process similar to the equation shown,in which octane is burned.
C8H18 + O2 $\rarr$CO2 + H2O + heat (not balanced)
Using the concept of entropy,interpret the implications of this reaction.

Accepted Answer

A)  It goes to the right because it is spontaneous after a spark is supplied. 
B)  It explains why a car stops running when there is no gas in the fuel tank. 
C)  Gasoline can be made commercially because the reaction can run backwards if the energy is returned to the CO2 and H2O. 
D)  All of these responses are correct with respect to entropy. 
A)  It goes to the right because it is spontaneous after a spark is supplied. 
B)  It explains why a car stops running when there is no gas in the fuel tank. 
C)  Gasoline can be made commercially because the reaction can run backwards if the energy is returned to the CO2 and H2O. 
D)  All of these responses are correct with respect to entropy.

Question 15

A reaction rate can be described using any unit of time (seconds,hours,etc. ).

Accepted Answer

A) True 
 B)False

Question 16

The equilibrium constants for a series of reaction of the general type:
AB+CD
 
AD+BC
were measured and are shown below.  In which reaction is the concentration of the products the largest at equilibrium?

Accepted Answer

A) 3.5×103 
B) 5.7×10-2 
C) 0.011 
D) 1.2 
A) 3.5×103 
B) 5.7×10-2 
C) 0.011 
D) 1.2

Question 17

The following reaction is observed in a lab experiment: A + 2B $\rarr$ C + D
In this experiment,it required 750 s for the concentration of C to change from 0.333 M to 0.750 M.What is the rate of the reaction?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 18

Which of the following interpretations of the spontaneous chemical reaction is correct? V + W $\rarr$ Y + Z + heat

Accepted Answer

A)  V is written first because it contains more energy than W,Y,or Z. 
B)  The entropy on the left of the equation is greater than that on the right. 
C)  The entropy on the right of the equation is greater than that on the left. 
D)  Entropy has nothing to do with this chemical equation. 
A)  V is written first because it contains more energy than W,Y,or Z. 
B)  The entropy on the left of the equation is greater than that on the right. 
C)  The entropy on the right of the equation is greater than that on the left. 
D)  Entropy has nothing to do with this chemical equation.

Question 19

Based upon the energy diagram given below,which letter represents the enthalpy for the reaction?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 20

At equilibrium,the relative concentrations of each species is the same as the coefficients in the balanced chemical equation.

Accepted Answer

A) True 
 B)False

Exam 8: Reaction Rates and Equilibrium

At 20°C,a sample of solid spontaneously sublimes to a gas.This change in state is accompanied by which of the following changes in the solid sample?

Which of the following is NOT true regarding a chemical reaction?

The reaction represented by this energy diagram is endothermic.

Which method can be used to product a timed-release medication?

Equilibrium: The following question(s)refer to the equilibrium given below in which all reactants and products are gases. CH4 + H2O CH3OH + H2 + heat Indicate the effect of the changing condition on the position of equilibrium. -Refer to Equilibrium.Remove H2 from the mixture.

The reaction below does not progress at room temperature,but does at 1100 ∘\circ∘ C.Therefore,this reaction is spontaneous at 1100 ∘\circ∘ C.

Reaction rates are determined experimentally.

In a system of equilibrium,it is true that the rate of the forward reaction

Consider the following energy diagram.Which letter represents the activation energy for the forward reaction?

Catalytic action is

A spontaneous process accompanied by an entropy decrease must also be accompanied by an energy decrease.

BrCl is put into an empty 1.00 L container.At equilibrium,the molar concentration of BrCl is 0.382,and that of Br2 is 0.319.Evaluate the equilibrium constant for the following reaction. Br2(g)+ Cl2(g) 2BrCl(g)

For the following energy diagram,which letter represents the catalyzed activation energy?

Most automobiles function by burning gasoline by a process similar to the equation shown,in which octane is burned. C8H18 + O2 →\rarr→ CO2 + H2O + heat (not balanced) Using the concept of entropy,interpret the implications of this reaction.

A reaction rate can be described using any unit of time (seconds,hours,etc. ).

The equilibrium constants for a series of reaction of the general type: AB+CD AD+BC were measured and are shown below. In which reaction is the concentration of the products the largest at equilibrium?

The following reaction is observed in a lab experiment: A + 2B →\rarr→ C + D In this experiment,it required 750 s for the concentration of C to change from 0.333 M to 0.750 M.What is the rate of the reaction?

Which of the following interpretations of the spontaneous chemical reaction is correct? V + W →\rarr→ Y + Z + heat

Based upon the energy diagram given below,which letter represents the enthalpy for the reaction?

At equilibrium,the relative concentrations of each species is the same as the coefficients in the balanced chemical equation.

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

Equilibrium: The following question(s)refer to the equilibrium given below in which all reactants and products are gases. CH₄ + H₂O CH₃OH + H₂ + heat Indicate the effect of the changing condition on the position of equilibrium. -Refer to Equilibrium.Remove H₂ from the mixture.

BrCl is put into an empty 1.00 L container.At equilibrium,the molar concentration of BrCl is 0.382,and that of Br₂ is 0.319.Evaluate the equilibrium constant for the following reaction. Br₂(g)+ Cl₂(g) 2BrCl(g)

Most automobiles function by burning gasoline by a process similar to the equation shown,in which octane is burned. C₈H₁₈ + O₂ $\rarr$ CO₂ + H₂O + heat (not balanced) Using the concept of entropy,interpret the implications of this reaction.

The following reaction is observed in a lab experiment: A + 2B $\rarr$ C + D In this experiment,it required 750 s for the concentration of C to change from 0.333 M to 0.750 M.What is the rate of the reaction?

Which of the following interpretations of the spontaneous chemical reaction is correct? V + W $\rarr$ Y + Z + heat