Question 1

Based on the following equilibrium constants,which reaction essentially goes to completion?
 
1)81 * 100

Accepted Answer

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

Question 2

The reaction conditions for a specific reaction,BCD + HA $\rarr$ ABCDH,are correct,but the reaction does not occur.What could be the reason?

Accepted Answer

A)  There are no collisions between the molecules. 
B)  The collisions of the particles with the container walls remove the required energy because it is transferred to the container molecules. 
C)  The orientation of the molecules with respect to each other is not correct for the reaction to occur. 
D)  There is more than one answer. 
A)  There are no collisions between the molecules. 
B)  The collisions of the particles with the container walls remove the required energy because it is transferred to the container molecules. 
C)  The orientation of the molecules with respect to each other is not correct for the reaction to occur. 
D)  There is more than one answer.

Question 3

Sulfur reacts with oxygen to produce sulfur dioxide,but only if the high activation energy is supplied.Which condition will lower the activation energy the most?

Accepted Answer

A)  stirring the mixture 
B)  heating the mixture 
C)  using a catalyst 
D)  activation energy cannot be lowered 
A)  stirring the mixture 
B)  heating the mixture 
C)  using a catalyst 
D)  activation energy cannot be lowered

Question 4

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 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.Add CH4 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 6

If heat is absorbed when a compound dissolves in water,the compound should be more soluble at higher temperatures.

Accepted Answer

A) True 
 B)False

Question 7

Which statement is incorrect with reference to Le Châtelier's principle?

Accepted Answer

A)  In a reaction of the type,Q + 2R
  3T,the addition of one mole of Q results in the tripling of T. 
B)  If the reaction to the right is exothermic,the reaction to the left must be endothermic. 
C)  If the reaction rate of the forward reaction is known,then the reaction rate of the reverse reaction is also known. 
D)  Responses b and c are incorrect. 
A)  In a reaction of the type,Q + 2R
  3T,the addition of one mole of Q results in the tripling of T. 
B)  If the reaction to the right is exothermic,the reaction to the left must be endothermic. 
C)  If the reaction rate of the forward reaction is known,then the reaction rate of the reverse reaction is also known. 
D)  Responses b and c are incorrect.

Question 8

A doctor has given your patient a prescription of a common amphetamine.What should the patient avoid when taking this medication?

Accepted Answer

A)  exercise 
B)  fruit juices 
C)  alcohol 
D)  none of the choices 
A)  exercise 
B)  fruit juices 
C)  alcohol 
D)  none of the choices

Question 9

Which of the conditions given is necessary for a chemical reaction to occur?

Accepted Answer

A)  The molecules of the reacting chemicals must be in motion. 
B)  The molecules of the reacting chemicals must bump into each other. 
C)  The molecules of the reacting chemicals must be of opposite charges. 
D)  The molecules of the reacting chemicals must be at different charges. 
A)  The molecules of the reacting chemicals must be in motion. 
B)  The molecules of the reacting chemicals must bump into each other. 
C)  The molecules of the reacting chemicals must be of opposite charges. 
D)  The molecules of the reacting chemicals must be at different charges.

Question 10

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 11

All chemical reactions require at least some amount of activation energy to proceed.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is most closely related to the term "reaction rate"?

Accepted Answer

A)  the temperature needed to initiate a reaction 
B)  the position of equilibrium when a reaction stops 
C)  the speed of a reaction 
D)  more than one response is correct 
A)  the temperature needed to initiate a reaction 
B)  the position of equilibrium when a reaction stops 
C)  the speed of a reaction 
D)  more than one response is correct

Question 13

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 14

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.
-The equilibrium for the following reaction at 1 atm and 25°C lies far to the left.A possible equilbrium constant for this reaction would be _____ .
N2 + 3H2  
3NH3

Accepted Answer

A)  0.5 
B)  0 
C)  1.5 
D)  impossible to predict K. 
A)  0.5 
B)  0 
C)  1.5 
D)  impossible to predict K.

Question 15

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.

Question 16

A reaction will occur each time two reactant molecules collide.

Accepted Answer

A) True 
 B)False

Question 17

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.Cool 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 18

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 19

Which of the statements is correct when referring to the following reaction?
H2(g)+ I2(g)  
2HI(g)

Accepted Answer

A)  This reaction is reversible because the amount of heat given off by the forward reaction is the same as the heat given off by the reverse reaction. 
B)  The physical state of the reaction is found by using
  . 
C)  Most of the matter is on the right side of the equation. 
D)  There isn't a correct response provided. 
A)  This reaction is reversible because the amount of heat given off by the forward reaction is the same as the heat given off by the reverse reaction. 
B)  The physical state of the reaction is found by using
  . 
C)  Most of the matter is on the right side of the equation. 
D)  There isn't a correct response provided.

Question 20

Chemical reactions always occur once the molecules of two substances collide.

Accepted Answer

A) True 
 B)False

Exam 8: Reaction Rates and Equilibrium

Based on the following equilibrium constants,which reaction essentially goes to completion? 1)81 * 100

The reaction conditions for a specific reaction,BCD + HA →\rarr→ ABCDH,are correct,but the reaction does not occur.What could be the reason?

Sulfur reacts with oxygen to produce sulfur dioxide,but only if the high activation energy is supplied.Which condition will lower the activation energy the most?

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?

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 CH4 to the mixture.

If heat is absorbed when a compound dissolves in water,the compound should be more soluble at higher temperatures.

Which statement is incorrect with reference to Le Châtelier's principle?

A doctor has given your patient a prescription of a common amphetamine.What should the patient avoid when taking this medication?

Which of the conditions given is necessary for a chemical reaction to occur?

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

All chemical reactions require at least some amount of activation energy to proceed.

Which of the following is most closely related to the term "reaction rate"?

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?

Homogeneous catalysts are thought to function by

A reaction will occur each time two reactant molecules collide.

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.Cool the mixture.

The concept of entropy

Which of the statements is correct when referring to the following reaction? H2(g)+ I2(g) 2HI(g)

Chemical reactions always occur once the molecules of two substances collide.

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

Based on the following equilibrium constants,which reaction essentially goes to completion? 1)81 * 10⁰

The reaction conditions for a specific reaction,BCD + HA $\rarr$ ABCDH,are correct,but the reaction does not occur.What could be the reason?

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 CH₄ to the mixture.

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.Cool the mixture.

Which of the statements is correct when referring to the following reaction? H₂(g)+ I₂(g) 2HI(g)