Question 1

The reaction represented by this energy diagram is endothermic.

Accepted Answer

A) True 
 B)False  False

Question 2

The energy required to start some spontaneous processes is called ___ .

Accepted Answer

A) internal energy 
B) collision energy 
C) free energy 
D) activation energy 
A) internal energy 
B) collision energy 
C) free energy 
D) activation energy D

Question 3

Increasing the concentration of a reactant will increase the number of effective collisions.

Accepted Answer

A) True 
 B)False  True

Question 4

Enthalpy always increases with increasing randomness.

Accepted Answer

A) True 
 B)False

Question 5

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 6

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 7

Which is an incorrect statement when discussing molecular collisions leading to the chemical reaction,AB + CD $\rightarrow$ 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.

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

The following reaction is observed in a lab experiment: A + 2B $\rightarrow$ 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

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

Question 11

The products of an exothermic reaction contain less energy than do the reactants.

Accepted Answer

A) True 
 B)False

Question 12

The only way to increase the rate of a reaction is to increase the concentration of the reactants.

Accepted Answer

A) True 
 B)False

Question 13

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 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.
-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 15

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 16

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 17

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 18

If we remove CO2 from 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 19

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 20

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.

Exam 8: Reaction Rates and Equilibrium

The reaction represented by this energy diagram is endothermic.

The energy required to start some spontaneous processes is called ___ .

Increasing the concentration of a reactant will increase the number of effective collisions.

Enthalpy always increases with increasing randomness.

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

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

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

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

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

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

The products of an exothermic reaction contain less energy than do the reactants.

The only way to increase the rate of a reaction is to increase the concentration of the reactants.

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 CH4 to the mixture.

Catalytic action is

The concept of entropy

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?

If we remove CO2 from the following equation,which way will the equilibrium shift? CO + H2O + heat CO2 + H2

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

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

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

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

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

The following reaction is observed in a lab experiment: A + 2B $\rightarrow$ 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?

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 we remove CO₂ from the following equation,which way will the equilibrium shift? CO + H₂O + heat CO₂ + H₂

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