Question 1

CFC's such as CF2Cl2,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

Accepted Answer

A)  This is not serious because the only area of the planet involved is at the poles and there is very little life to be affected by the increase in UV. 
B)  The catalyzing of the ozone breakdown decreases the amount of UV at the surface of the planet. 
C)  The process by which the ozone is degraded is catalytic and can be controlled by the reduction of CFC's. 
D)  All of these responses are correct. 
A)  This is not serious because the only area of the planet involved is at the poles and there is very little life to be affected by the increase in UV. 
B)  The catalyzing of the ozone breakdown decreases the amount of UV at the surface of the planet. 
C)  The process by which the ozone is degraded is catalytic and can be controlled by the reduction of CFC's. 
D)  All of these responses are correct. C

Question 2

What is the direct cause of a chemical reaction of the type E + F $\rarr$ EF?

Accepted Answer

A)  Catalysts are the direct cause of chemical reactions of this type. 
B)  The energy in the environment at room temperature causes the reaction. 
C)  The electromagnetic attraction between E and F draw them together. 
D)  Collisions occurring between E's and F's lead them to reaction. 
A)  Catalysts are the direct cause of chemical reactions of this type. 
B)  The energy in the environment at room temperature causes the reaction. 
C)  The electromagnetic attraction between E and F draw them together. 
D)  Collisions occurring between E's and F's lead them to reaction. D

Question 3

Which of the following will influence all reaction rates?

Accepted Answer

A)  the presence of catalysts 
B)  the temperature of reactants 
C)  the concentration of reactants 
D)  more than one response is correct 
A)  the presence of catalysts 
B)  the temperature of reactants 
C)  the concentration of reactants 
D)  more than one response is correct D

Question 4

Which of the following states of matter generally has the lowest entropy?

Accepted Answer

A)  a crystalline solid 
B)  a liquid 
C)  a gas 
D)  two have the same entropy 
A)  a crystalline solid 
B)  a liquid 
C)  a gas 
D)  two have the same entropy

Question 5

A reaction rate can be described in terms of the change in concentration of either a reactant or a product.

Accepted Answer

A) True 
 B)False

Question 6

Catalysts may lower the activation energy.

Accepted Answer

A) True 
 B)False

Question 7

For the reaction NO2 (g)+ N2O(g)   
 3 NO(g)the equilibrium constant expression is:

Accepted Answer

A) True 
 B)False

Question 8

Which is assumed to be true in most explanations of how reactions occur?

Accepted Answer

A)  reactant particles must collide with each other 
B)  catalysts must be present 
C)  energy must be absorbed as the reaction proceeds 
D)  more than one response is correct 
A)  reactant particles must collide with each other 
B)  catalysts must be present 
C)  energy must be absorbed as the reaction proceeds 
D)  more than one response is correct

Question 9

When a spontaneous process in accompanied by an energy increase,then a large entropy increase must also occur.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following would be the equilibrium expression for the system given below?
N2(g)+ 3F2(g)  
2NF3(g)

Accepted Answer

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

Question 11

Which statement applies to a reaction at equilibrium?

Accepted Answer

A)  The energy of activation has been supplied to bring the reaction to equilibrium. 
B)  The state of the equilibrium can be expressed as a ratio. 
C)  There are equal amounts of matter on either side of the reaction. 
D)  All of the responses are correct. 
A)  The energy of activation has been supplied to bring the reaction to equilibrium. 
B)  The state of the equilibrium can be expressed as a ratio. 
C)  There are equal amounts of matter on either side of the reaction. 
D)  All of the responses are correct.

Question 12

In an exergonic process,the system _____ .

Accepted Answer

A)  gains energy 
B)  loses energy 
C)  either gains or loses energy 
D)  no energy change at all 
A)  gains energy 
B)  loses energy 
C)  either gains or loses energy 
D)  no energy change at all

Question 13

Which of the following statements about a K of 3.5 calculated for a specific chemical reaction at equilibrium is incorrect?

Accepted Answer

A)  It was calculated by dividing the product of the products by that of the reactants. 
B)  It indicates that one side of the reaction has most of the matter present. 
C)  It is an evaluation of the extent of the two chemical reactions involved: the forward and the reverse reactions. 
D)  A K of 3.5 indicates that a catalyst will push the reaction to the right. 
A)  It was calculated by dividing the product of the products by that of the reactants. 
B)  It indicates that one side of the reaction has most of the matter present. 
C)  It is an evaluation of the extent of the two chemical reactions involved: the forward and the reverse reactions. 
D)  A K of 3.5 indicates that a catalyst will push the reaction to the right.

Question 14

A process that gains or accepts energy as it takes place is a(n)_____ .

Accepted Answer

A)  exergonic process 
B)  spontaneous process 
C)  endergonic process 
D)  all of these 
A)  exergonic process 
B)  spontaneous process 
C)  endergonic process 
D)  all of these

Question 15

An elderly person comes to you on a winter day with blue fingers and toes,sluggish movement,and slurred speech.What condition do they most likely have?

Accepted Answer

A)  hyperthermia 
B)  hypothermia 
C)  heat exhaustion 
D)  none of the choices 
A)  hyperthermia 
B)  hypothermia 
C)  heat exhaustion 
D)  none of the choices

Question 16

Which of the following products is not suitable to timed-release method for medications that are desired to have an extended effective level time?

Accepted Answer

A)  appetite control materials 
B)  analgesics used for middle-aged people 
C)  fluoride compounds in a toothpaste 
D)  diuretics 
A)  appetite control materials 
B)  analgesics used for middle-aged people 
C)  fluoride compounds in a toothpaste 
D)  diuretics

Question 17

If we add a catalyst to the following equation,which way will the equilibrium shift?
CO + H2O + heat  
CO2 + H2

Accepted Answer

A)  to the left 
B)  will have no effect 
C)  to the right 
D)  not enough information. 
A)  to the left 
B)  will have no effect 
C)  to the right 
D)  not enough information.

Question 18

A heterogeneous catalyst will normally dissolve in the reaction mixture.

Accepted Answer

A) True 
 B)False

Question 19

Which statement is a correct application of Le Châtelier's principle?

Accepted Answer

A)  Addition of a substance to the left side of an equilibrium shifts it to the right. 
B)  Any stress to the right side of a chemical equilibrium results in a shift to the left to relieve the stress. 
C)  Heat added or taken away from a chemical equilibrium in which one side is exothermic will not shift the reaction. 
D)  Responses b and c are correct. 
A)  Addition of a substance to the left side of an equilibrium shifts it to the right. 
B)  Any stress to the right side of a chemical equilibrium results in a shift to the left to relieve the stress. 
C)  Heat added or taken away from a chemical equilibrium in which one side is exothermic will not shift the reaction. 
D)  Responses b and c are correct.

Question 20

For the reaction below,which of the following would take place once pure A and B are mixed together?
A + B  
C

Accepted Answer

A)  The concentration of C would increase for a time,then remain constant. 
B)  The concentration of A would increase for a time,then decrease. 
C)  The concentration of B would increase for a time,then remain constant. 
D)  More than one response is correct. 
A)  The concentration of C would increase for a time,then remain constant. 
B)  The concentration of A would increase for a time,then decrease. 
C)  The concentration of B would increase for a time,then remain constant. 
D)  More than one response is correct.

Exam 8: Reaction Rates and Equilibrium

CFC's such as CF2Cl2,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

What is the direct cause of a chemical reaction of the type E + F →\rarr→ EF?

Which of the following will influence all reaction rates?

Which of the following states of matter generally has the lowest entropy?

A reaction rate can be described in terms of the change in concentration of either a reactant or a product.

Catalysts may lower the activation energy.

For the reaction NO2 (g)+ N2O(g) 3 NO(g)the equilibrium constant expression is:

Which is assumed to be true in most explanations of how reactions occur?

When a spontaneous process in accompanied by an energy increase,then a large entropy increase must also occur.

Which of the following would be the equilibrium expression for the system given below? N2(g)+ 3F2(g) 2NF3(g)

Which statement applies to a reaction at equilibrium?

In an exergonic process,the system _____ .

Which of the following statements about a K of 3.5 calculated for a specific chemical reaction at equilibrium is incorrect?

A process that gains or accepts energy as it takes place is a(n)_____ .

An elderly person comes to you on a winter day with blue fingers and toes,sluggish movement,and slurred speech.What condition do they most likely have?

Which of the following products is not suitable to timed-release method for medications that are desired to have an extended effective level time?

If we add a catalyst to the following equation,which way will the equilibrium shift? CO + H2O + heat CO2 + H2

A heterogeneous catalyst will normally dissolve in the reaction mixture.

Which statement is a correct application of Le Châtelier's principle?

For the reaction below,which of the following would take place once pure A and B are mixed together? A + B C

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

CFC's such as CF₂Cl₂,are associated with the increase in chemical activity that degrades ozone.Which of the following relates to this phenomenon?

What is the direct cause of a chemical reaction of the type E + F $\rarr$ EF?

For the reaction NO₂ (g)+ N₂O(g) 3 NO(g)the equilibrium constant expression is:

Which of the following would be the equilibrium expression for the system given below? N₂(g)+ 3F₂(g) 2NF₃(g)

If we add a catalyst to the following equation,which way will the equilibrium shift? CO + H₂O + heat CO₂ + H₂