Question 1

Which is an incorrect statement when discussing molecular collisions leading to the chemical reaction, AB + CD → AD + CB?

Accepted Answer

A) The faster the motion of the molecules, the more likely they are to collide. 
B) The faster the motion of the molecules, the greater the probability that a chemical reaction will occur. 
C) The slower the motion of the molecules, the more likely that this reaction will become an equilibrium reaction favoring the left side of the equation. 
D) The relationship between molecular collisions and reaction rate is direct. 
A) The faster the motion of the molecules, the more likely they are to collide. 
B) The faster the motion of the molecules, the greater the probability that a chemical reaction will occur. 
C) The slower the motion of the molecules, the more likely that this reaction will become an equilibrium reaction favoring the left side of the equation. 
D) The relationship between molecular collisions and reaction rate is direct. C

Question 2

What would be the effect of doubling the pressure on the following equilibrium system? N2(g)+ 3F2(g)   2NF3(g)

Accepted Answer

A) Shift it to the right. 
B) Shift it to the left. 
C) Will have no effect. 
D) Will be impossible to predict. 
A) Shift it to the right. 
B) Shift it to the left. 
C) Will have no effect. 
D) Will be impossible to predict. A

Question 3

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. D

Question 4

Decreasing the temperature will decrease the number of effective collisions.

Accepted Answer

A) True 
 B)False

Question 5

You've been told that 'when a change is made in any factor of an established equilibrium, the position of equilibrium will shift in a direction that will minimize or oppose the change.'  This is a statement of which of the following?

Accepted Answer

A) molecular collision principle 
B) Le Châtelier's principle 
C) law of definite proportions 
D) Boyle's law 
A) molecular collision principle 
B) Le Châtelier's principle 
C) law of definite proportions 
D) Boyle's law

Question 6

You purchase a glow stick during an evening parade.  After it ends, your roommate tells you that if you place it in the freezer, it will glow for a longer time. Assuming she knows what she is talking about, why would this be true?

Accepted Answer

A) Reaction rates can be expected to decrease as temperature is reduced. 
B) It's dark in a closed freezer, preventing the stick from glowing. 
C) There is less oxygen inside the freezer than outside, so the reaction slows down. 
D) Your roommate simply made up the story to annoy you. 
A) Reaction rates can be expected to decrease as temperature is reduced. 
B) It's dark in a closed freezer, preventing the stick from glowing. 
C) There is less oxygen inside the freezer than outside, so the reaction slows down. 
D) Your roommate simply made up the story to annoy you.

Question 7

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.

Question 8

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.

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 9

The following reaction is observed in a lab experiment:    A + 2B → 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 10

A room filled with a 2:1 mixture of hydrogen and oxygen gases can be safely inhaled.  However, with a single spark, it can react explosively.  Since the explosion would be considered a spontaneous process, what did the spark provide?

Accepted Answer

A) endothermic energy 
B) exothermic energy 
C) free energy 
D) activation energy 
A) endothermic energy 
B) exothermic energy 
C) free energy 
D) activation energy

Question 11

​ Explain the difference between a homogeneous and a heterogeneous catalyst.

Accepted Answer

A homogeneous catalyst is a catalytic su

Question 12

CFC's are in the environment because they were released into the atmosphere. What was the use of CFC's?

Accepted Answer

A) These are Chlorine-Fluorine Chain compounds used to purify the water. 
B) CFC's were used in pressurized cans that dispersed hair spray, paint, and other sprayed materials. 
C) CFC's had a use in the manufacture of steel and were released to the atmosphere by large industry. 
D) There is more than one correct response. 
A) These are Chlorine-Fluorine Chain compounds used to purify the water. 
B) CFC's were used in pressurized cans that dispersed hair spray, paint, and other sprayed materials. 
C) CFC's had a use in the manufacture of steel and were released to the atmosphere by large industry. 
D) There is more than one correct response.

Question 13

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 14

The concept of entropy

Accepted Answer

A) is employed to explain how energy can be stored. 
B) is employed to explain how an exothermic reaction can become endothermic. 
C) is employed as an indicator of disorder in a system. 
D) explains why most chemical reactions are endothermic. 
A) is employed to explain how energy can be stored. 
B) is employed to explain how an exothermic reaction can become endothermic. 
C) is employed as an indicator of disorder in a system. 
D) explains why most chemical reactions are endothermic.

Question 15

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 16

A reaction is spontaneous when the conditions are

Accepted Answer

A) present for that reaction to progress and it does. 
B) at STP. 
C) such for an exothermic reaction that there is less energy in the reactants than in the products. 
D) There is more than one correct response. 
A) present for that reaction to progress and it does. 
B) at STP. 
C) such for an exothermic reaction that there is less energy in the reactants than in the products. 
D) There is more than one correct response.

Question 17

Based on the following equilibrium constants, which reaction essentially goes to completion?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 18

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 19

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. Add a catalyst to 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 20

Homogeneous catalysts are thought to function by

Accepted Answer

A) raising the temperature. 
B) lowering activation energy of a reaction. 
C) removing a reacting molecule. 
D) More than one response is correct. 
A) raising the temperature. 
B) lowering activation energy of a reaction. 
C) removing a reacting molecule. 
D) More than one response is correct.

Exam 8: Reaction Rates and Equilibrium

Which is an incorrect statement when discussing molecular collisions leading to the chemical reaction, AB + CD → AD + CB?

What would be the effect of doubling the pressure on the following equilibrium system? N2(g)+ 3F2(g) 2NF3(g)

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

Decreasing the temperature will decrease the number of effective collisions.

You've been told that 'when a change is made in any factor of an established equilibrium, the position of equilibrium will shift in a direction that will minimize or oppose the change.' This is a statement of which of the following?

You purchase a glow stick during an evening parade. After it ends, your roommate tells you that if you place it in the freezer, it will glow for a longer time. Assuming she knows what she is talking about, why would this be true?

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

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 following reaction is observed in a lab experiment: A + 2B → 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?

A room filled with a 2:1 mixture of hydrogen and oxygen gases can be safely inhaled. However, with a single spark, it can react explosively. Since the explosion would be considered a spontaneous process, what did the spark provide?

​ Explain the difference between a homogeneous and a heterogeneous catalyst.

CFC's are in the environment because they were released into the atmosphere. What was the use of CFC's?

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

The concept of entropy

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

A reaction is spontaneous when the conditions are

Based on the following equilibrium constants, which reaction essentially goes to completion?

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

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. Add a catalyst to the mixture.

Homogeneous catalysts are thought to function by

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

What would be the effect of doubling the pressure on the following equilibrium system? N₂(g)+ 3F₂(g) 2NF₃(g)

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

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.

Explain the difference between a homogeneous and a heterogeneous catalyst.

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. Add a catalyst to the mixture.