Question 1

Which statement BEST describes how calorimetry is used in medicine?

Accepted Answer

A)  Calorimetry is used to feed patients. 
B)  Calorimetry is used to measure the temperature of a patient. 
C)  Calorimetry is used to measure the oxygen needs of a patient. 
D)  Calorimetry is used to assess the caloric needs of a patient. 
E)  All of the above describe calorimetry use in medicine. 
A)  Calorimetry is used to feed patients. 
B)  Calorimetry is used to measure the temperature of a patient. 
C)  Calorimetry is used to measure the oxygen needs of a patient. 
D)  Calorimetry is used to assess the caloric needs of a patient. 
E)  All of the above describe calorimetry use in medicine. D

Question 2

An endothermic reaction absorbs heat when it occurs.How can the equilibrium of an endothermic reaction be shifted toward the products?

Accepted Answer

A)  It is not possible to do this. 
B)  Add more products. 
C)  Cool down the reaction. 
D)  Add a catalyst. 
E)  Heat the reaction. 
A)  It is not possible to do this. 
B)  Add more products. 
C)  Cool down the reaction. 
D)  Add a catalyst. 
E)  Heat the reaction. E

Question 3

A calorimeter is used to measure the energy content of foods because the energy measurement obtained using a calorimeter is the same as the energy we obtain by eating.Which of the following statements explains why this is the case?

Accepted Answer

A)  They are the same because both the calorimeter and body combust food to obtain only heat energy. 
B)  They are the same because both the calorimeter and body combust food in a single exothermic step. 
C)  They are the same because both the calorimeter and body combust food in a complex series of steps. 
D)  They are the same because, overall, metabolism is a combustion reaction. 
E)  Actually, they are not the same values. 
A)  They are the same because both the calorimeter and body combust food to obtain only heat energy. 
B)  They are the same because both the calorimeter and body combust food in a single exothermic step. 
C)  They are the same because both the calorimeter and body combust food in a complex series of steps. 
D)  They are the same because, overall, metabolism is a combustion reaction. 
E)  Actually, they are not the same values. D

Question 4

Which statement BEST describes how the temperature of the surroundings changes as a result of the reaction represented by energy diagram below?

Accepted Answer

A)  The temperature of the surroundings does not change. 
B)  The temperature of the surroundings increases. 
C)  The temperature of the surroundings decreases. 
D)  The surroundings will become very cold. 
E)  It is not possible to predict anything about the temperature of the surroundings based on this diagram. 
A)  The temperature of the surroundings does not change. 
B)  The temperature of the surroundings increases. 
C)  The temperature of the surroundings decreases. 
D)  The surroundings will become very cold. 
E)  It is not possible to predict anything about the temperature of the surroundings based on this diagram.

Question 5

The following reaction is a reversible reaction.Which statement BEST describes what it means for this reaction to be reversible? HCOOH + HOCH3 ⇌ HCOOCH3 + H2O

Accepted Answer

A)  This reaction only occurs in the reverse direction as written above. 
B)  All of the reactant molecules react to make product, and then all of the product molecules react to make reactants again. 
C)  Forward and reverse reactions proceed at the same rate. 
D)  Forward and reverse reactions occur simultaneously. 
E)  The rate of the reverse reaction is must faster than the rate of the forward reaction. 
A)  This reaction only occurs in the reverse direction as written above. 
B)  All of the reactant molecules react to make product, and then all of the product molecules react to make reactants again. 
C)  Forward and reverse reactions proceed at the same rate. 
D)  Forward and reverse reactions occur simultaneously. 
E)  The rate of the reverse reaction is must faster than the rate of the forward reaction.

Question 6

When bonds break, energy is

Accepted Answer

A)  always released. 
B)  always absorbed. 
C)  typically released but sometimes absorbed. 
D)  typically absorbed but sometimes released. 
E)  absorbed half the time and released half the time. 
A)  always released. 
B)  always absorbed. 
C)  typically released but sometimes absorbed. 
D)  typically absorbed but sometimes released. 
E)  absorbed half the time and released half the time.

Question 7

Which of the following changes increases the rate of a reaction?

Accepted Answer

A)  adding a catalyst 
B)  decreasing temperature 
C)  decreasing concentration 
D)  removing product as it is formed 
E)  All of the above increase the rate of a reaction. 
A)  adding a catalyst 
B)  decreasing temperature 
C)  decreasing concentration 
D)  removing product as it is formed 
E)  All of the above increase the rate of a reaction.

Question 8

Select the TRUE statement concerning rate of reactions.

Accepted Answer

A)  A large activation energy indicates high heat of reaction. 
B)  A small activation energy indicates high heat of reaction. 
C)  A large activation energy indicates low heat of reaction. 
D)  A small activation energy indicates low heat of reaction. 
E)  The activation energy is independent of the heat of reaction. 
A)  A large activation energy indicates high heat of reaction. 
B)  A small activation energy indicates high heat of reaction. 
C)  A large activation energy indicates low heat of reaction. 
D)  A small activation energy indicates low heat of reaction. 
E)  The activation energy is independent of the heat of reaction.

Question 9

Convert 3.5 × 104 J to calories.

Accepted Answer

A)  8,365 calories 
B)  0.84 calories 
C)  8.4 × 103 calories 
D)  1.5 × 105 calories 
E)  14,644 calories 
A)  8,365 calories 
B)  0.84 calories 
C)  8.4 × 103 calories 
D)  1.5 × 105 calories 
E)  14,644 calories

Question 10

Why does increasing the concentration of reactants typically increase the rate of a reaction?

Accepted Answer

A)  A higher concentration of reactants means a higher kinetic energy per molecule. 
B)  A higher concentration of reactants means a lower activation energy. 
C)  A higher concentration of reactants means that a catalyst has been added. 
D)  A higher concentration of reactants means a higher activation energy. 
E)  A higher concentration of reactants means more collisions per amount of time. 
A)  A higher concentration of reactants means a higher kinetic energy per molecule. 
B)  A higher concentration of reactants means a lower activation energy. 
C)  A higher concentration of reactants means that a catalyst has been added. 
D)  A higher concentration of reactants means a higher activation energy. 
E)  A higher concentration of reactants means more collisions per amount of time.

Question 11

If a reaction has a ΔHrxn< 0, the reaction is

Accepted Answer

A)  impossible. 
B)  exothermic. 
C)  endothermic. 
D)  explosive. 
E)  important in metabolism. 
A)  impossible. 
B)  exothermic. 
C)  endothermic. 
D)  explosive. 
E)  important in metabolism.

Question 12

If a reaction has a ΔHrxn > 0, the reaction is

Accepted Answer

A)  impossible. 
B)  exothermic. 
C)  endothermic. 
D)  explosive. 
E)  important in metabolism. 
A)  impossible. 
B)  exothermic. 
C)  endothermic. 
D)  explosive. 
E)  important in metabolism.

Question 13

Increasing the temperature of a reaction causes the

Accepted Answer

A)  reactants to move faster. 
B)  reactants to collide more frequently. 
C)  reactants to collide with more energy. 
D)  rate of reaction to increase. 
E)  All of the above result from increasing the temperature. 
A)  reactants to move faster. 
B)  reactants to collide more frequently. 
C)  reactants to collide with more energy. 
D)  rate of reaction to increase. 
E)  All of the above result from increasing the temperature.

Question 14

The reaction of water with ammonia is shown below.What will happen if ammonium is added to the solution when it is at equilibrium? NH3 + H2O ⇌ NH4+ + OH-
 ammonia water ammonium hydroxide

Accepted Answer

A)  Nothing will happen. 
B)  The result is not predictable. 
C)  The ammonium will bubble. 
D)  The equilibrium will shift to the right. 
E)  The equilibrium will shift to the left. 
A)  Nothing will happen. 
B)  The result is not predictable. 
C)  The ammonium will bubble. 
D)  The equilibrium will shift to the right. 
E)  The equilibrium will shift to the left.

Question 15

Carbohydrates and fats are sources of energy for cells because

Accepted Answer

A)  they contain many C-C and C-H bonds, which are high in potential energy. 
B)  they are easy to metabolize. 
C)  they are readily absorbed from food. 
D)  they contain many C-C and C-H bonds, which are low in potential energy. 
E)  Both a and c are correct. 
A)  they contain many C-C and C-H bonds, which are high in potential energy. 
B)  they are easy to metabolize. 
C)  they are readily absorbed from food. 
D)  they contain many C-C and C-H bonds, which are low in potential energy. 
E)  Both a and c are correct.

Question 16

Each of the following figures represents a reaction.Which reaction(s)has/have the slowest rate?

Accepted Answer

A)  a and b 
B)  a, b, c, d and e 
C)  all but d 
D)  b only 
E)  b and e 
A)  a and b 
B)  a, b, c, d and e 
C)  all but d 
D)  b only 
E)  b and e

Question 17

A hot dog contains 151 Calories.How many joules of energy is this?

Accepted Answer

A)  36 joules 
B)  632 joules 
C)  632,000 joules 
D)  3.6 × 104 joules 
E)  360 joules 
A)  36 joules 
B)  632 joules 
C)  632,000 joules 
D)  3.6 × 104 joules 
E)  360 joules

Question 18

Select the TRUE statement concerning a reaction at equilibrium.

Accepted Answer

A)  The forward reaction continues to convert reactants into products. 
B)  The reverse reaction continues to convert products into reactants. 
C)  The rate of the forward reaction is the same as the rate of the reverse reaction. 
D)  The concentration of each reactant and product is constant. 
E)  All of the above are true concerning a reaction at equilibrium. 
A)  The forward reaction continues to convert reactants into products. 
B)  The reverse reaction continues to convert products into reactants. 
C)  The rate of the forward reaction is the same as the rate of the reverse reaction. 
D)  The concentration of each reactant and product is constant. 
E)  All of the above are true concerning a reaction at equilibrium.

Question 19

How is the joule related to the calorie?

Accepted Answer

A)  1 cal = 4.184 J 
B)  1 J = 4.184 cal 
C)  1 Calorie = 4.184 J 
D)  1 J = 4.184 Calorie 
E)  1 J = 4.184 kcal 
A)  1 cal = 4.184 J 
B)  1 J = 4.184 cal 
C)  1 Calorie = 4.184 J 
D)  1 J = 4.184 Calorie 
E)  1 J = 4.184 kcal

Question 20

Combustion reactions are ___________ because products of the reaction are _________ in potential energy than the reactants.

Accepted Answer

A)  endothermic; higher 
B)  exothermic; higher 
C)  endothermic; lower 
D)  exothermic; lower 
E)  endothermic; the same 
A)  endothermic; higher 
B)  exothermic; higher 
C)  endothermic; lower 
D)  exothermic; lower 
E)  endothermic; the same

Which statement BEST describes how calorimetry is used in medicine?

An endothermic reaction absorbs heat when it occurs.How can the equilibrium of an endothermic reaction be shifted toward the products?

A calorimeter is used to measure the energy content of foods because the energy measurement obtained using a calorimeter is the same as the energy we obtain by eating.Which of the following statements explains why this is the case?

Which statement BEST describes how the temperature of the surroundings changes as a result of the reaction represented by energy diagram below?

The following reaction is a reversible reaction.Which statement BEST describes what it means for this reaction to be reversible? HCOOH + HOCH₃ ⇌ HCOOCH₃ + H₂O

When bonds break, energy is

Which of the following changes increases the rate of a reaction?

Select the TRUE statement concerning rate of reactions.

Convert 3.5 × 10⁴ J to calories.

Why does increasing the concentration of reactants typically increase the rate of a reaction?

If a reaction has a ΔH_rxn< 0, the reaction is

If a reaction has a ΔH_rxn > 0, the reaction is

Increasing the temperature of a reaction causes the

The reaction of water with ammonia is shown below.What will happen if ammonium is added to the solution when it is at equilibrium? NH₃ + H₂O ⇌ NH₄⁺ + OH^- ammonia water ammonium hydroxide

Carbohydrates and fats are sources of energy for cells because

Each of the following figures represents a reaction.Which reaction(s)has/have the slowest rate?

A hot dog contains 151 Calories.How many joules of energy is this?

Select the TRUE statement concerning a reaction at equilibrium.

How is the joule related to the calorie?

Combustion reactions are ___ because products of the reaction are _ in potential energy than the reactants.

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 6: Chemical Reactions: Energy, Rates, and Equilibrium

Which statement BEST describes how calorimetry is used in medicine?

An endothermic reaction absorbs heat when it occurs.How can the equilibrium of an endothermic reaction be shifted toward the products?

A calorimeter is used to measure the energy content of foods because the energy measurement obtained using a calorimeter is the same as the energy we obtain by eating.Which of the following statements explains why this is the case?

Which statement BEST describes how the temperature of the surroundings changes as a result of the reaction represented by energy diagram below?

The following reaction is a reversible reaction.Which statement BEST describes what it means for this reaction to be reversible? HCOOH + HOCH3 ⇌ HCOOCH3 + H2O

When bonds break, energy is

Which of the following changes increases the rate of a reaction?

Select the TRUE statement concerning rate of reactions.

Convert 3.5 × 104 J to calories.

Why does increasing the concentration of reactants typically increase the rate of a reaction?

If a reaction has a ΔHrxn< 0, the reaction is

If a reaction has a ΔHrxn > 0, the reaction is

Increasing the temperature of a reaction causes the

The reaction of water with ammonia is shown below.What will happen if ammonium is added to the solution when it is at equilibrium? NH3 + H2O ⇌ NH4+ + OH- ammonia water ammonium hydroxide

Carbohydrates and fats are sources of energy for cells because

Each of the following figures represents a reaction.Which reaction(s)has/have the slowest rate?

A hot dog contains 151 Calories.How many joules of energy is this?

Select the TRUE statement concerning a reaction at equilibrium.

How is the joule related to the calorie?

Combustion reactions are ___________ because products of the reaction are _________ in potential energy than the reactants.

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

The following reaction is a reversible reaction.Which statement BEST describes what it means for this reaction to be reversible? HCOOH + HOCH₃ ⇌ HCOOCH₃ + H₂O

Convert 3.5 × 10⁴ J to calories.

If a reaction has a ΔH_rxn< 0, the reaction is

If a reaction has a ΔH_rxn > 0, the reaction is

The reaction of water with ammonia is shown below.What will happen if ammonium is added to the solution when it is at equilibrium? NH₃ + H₂O ⇌ NH₄⁺ + OH^- ammonia water ammonium hydroxide

Combustion reactions are ___ because products of the reaction are _ in potential energy than the reactants.