Question 1

During catabolism of food, heat is released.Where does this energy go?

Accepted Answer

A)  It is turned into heat energy. 
B)  It is used in movement. 
C)  It is used to drive additional chemical reactions. 
D)  It is transferred to ATP. 
E)  All of the above are possible. 
A)  It is turned into heat energy. 
B)  It is used in movement. 
C)  It is used to drive additional chemical reactions. 
D)  It is transferred to ATP. 
E)  All of the above are possible.

Question 2

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

Accepted Answer

A)  adding a catalyst 
B)  increasing temperature 
C)  increasing concentration 
D)  decreasing concentration 
E)  All of the above decrease the rate of a reaction. 
A)  adding a catalyst 
B)  increasing temperature 
C)  increasing concentration 
D)  decreasing concentration 
E)  All of the above decrease the rate of a reaction.

Question 3

The energy difference between I and III in the diagram is called

Accepted Answer

A)  the activation energy 
B)  kinetic energy 
C)  heat of reaction 
D)  exothermic energy 
E)  endothermic energy 
A)  the activation energy 
B)  kinetic energy 
C)  heat of reaction 
D)  exothermic energy 
E)  endothermic energy

Question 4

By moving, breathing, and living, you do work every day.Work requires energy.Where does this energy come from?

Accepted Answer

A)  The energy comes from food; it undergoes chemical reactions in the cells. 
B)  The energy does not come from anyplace; it is always in our bodies. 
C)  The energy comes from breaking bonds in food. 
D)  The energy comes from breaking bonds in food, oxygen, and water. 
E)  No one really understands where this energy comes from. 
A)  The energy comes from food; it undergoes chemical reactions in the cells. 
B)  The energy does not come from anyplace; it is always in our bodies. 
C)  The energy comes from breaking bonds in food. 
D)  The energy comes from breaking bonds in food, oxygen, and water. 
E)  No one really understands where this energy comes from.

Question 5

Each of the following figures represents a reaction.Which reaction has the fastest rate?

Accepted Answer

A)  diagram a 
B)  diagram b 
C)  diagram c 
D)  diagram d 
E)  diagram e 
A)  diagram a 
B)  diagram b 
C)  diagram c 
D)  diagram d 
E)  diagram e

Question 6

Which of the following statements BEST describes catabolic pathways? I.Catabolic pathways build larger molecules from smaller ones.
II)Overall, catabolic pathways release energy.
III)An example of catabolism is when starch is broken down into smaller units of glucose during digestion.

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  II and III 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  II and III

Question 7

Which of the following statements describes an endothermic chemical reaction?

Accepted Answer

A)  During photosynthesis, plants harvest light energy in order to drive the synthesis of carbohydrates from CO2 and H2O. 
B)  A natural gas burner can be used to heat water. 
C)  Melting an ice cube requires temperatures above freezing. 
D)  Metabolizing food supplies the body with the energy required to heat ourselves and move. 
E)  Exposing water to cold temperatures results in freezing. 
A)  During photosynthesis, plants harvest light energy in order to drive the synthesis of carbohydrates from CO2 and H2O. 
B)  A natural gas burner can be used to heat water. 
C)  Melting an ice cube requires temperatures above freezing. 
D)  Metabolizing food supplies the body with the energy required to heat ourselves and move. 
E)  Exposing water to cold temperatures results in freezing.

Question 8

During anabolism, heat is absorbed.What does the absorption of heat tell us about how these reactions occur?

Accepted Answer

A)  These reactions do not usually occur because they require energy. 
B)  These reactions occur very quickly. 
C)  These reactions occur very slowly. 
D)  These reactions are driven by heat-releasing chemical reactions. 
E)  These reactions are not required by the body. 
A)  These reactions do not usually occur because they require energy. 
B)  These reactions occur very quickly. 
C)  These reactions occur very slowly. 
D)  These reactions are driven by heat-releasing chemical reactions. 
E)  These reactions are not required by the body.

Question 9

The nutritional unit of energy is the

Accepted Answer

A)  calorie. 
B)  Calorie or kcal. 
C)  joule. 
D)  thermal unit. 
E)  heat of reaction. 
A)  calorie. 
B)  Calorie or kcal. 
C)  joule. 
D)  thermal unit. 
E)  heat of reaction.

Question 10

Compounds that are used as fuels

Accepted Answer

A)  contain C-C bonds. 
B)  contain C-H bonds. 
C)  are high in potential energy. 
D)  contain weak bonds. 
E)  All of these are used as fuels. 
A)  contain C-C bonds. 
B)  contain C-H bonds. 
C)  are high in potential energy. 
D)  contain weak bonds. 
E)  All of these are used as fuels.

Question 11

The chemical reaction in the diagram below is a(n)_____________ reaction.

Accepted Answer

A)  activated 
B)  kinetic 
C)  heated 
D)  exothermic 
E)  endothermic 
A)  activated 
B)  kinetic 
C)  heated 
D)  exothermic 
E)  endothermic

Question 12

Metabolism is

Accepted Answer

A)  the breakdown of food. 
B)  the citric acid cycle. 
C)  the process by which fat is stored or burned. 
D)  all catabolic and anabolic pathways in the body. 
E)  the tendency to gain or lose weight. 
A)  the breakdown of food. 
B)  the citric acid cycle. 
C)  the process by which fat is stored or burned. 
D)  all catabolic and anabolic pathways in the body. 
E)  the tendency to gain or lose weight.

Question 13

The reaction, shown below, that occurs in a hydrogen fuel cell is exothermic.According to the conservation of energy, the reverse reaction (the electrolysis of water) 2 H2 + O2 → 2 H2O hydrogen fuel cell
2 H2O → 2 H2 + O2 electrolysis of water

Accepted Answer

A)  is also exothermic. 
B)  is endothermic. 
C)  does not involve energy. 
D)  has an energy change of zero. 
E)  involves energy in some way, but it is impossible to determine how. 
A)  is also exothermic. 
B)  is endothermic. 
C)  does not involve energy. 
D)  has an energy change of zero. 
E)  involves energy in some way, but it is impossible to determine how.

Question 14

Select the TRUE statement concerning rate of reactions.

Accepted Answer

A)  A large activation energy indicates a fast reaction. 
B)  A catalyst increases the activation energy. 
C)  Low temperatures help reactants to collide with each other. 
D)  Slow reactions have high activation energies. 
E)  All of the above statements are true. 
A)  A large activation energy indicates a fast reaction. 
B)  A catalyst increases the activation energy. 
C)  Low temperatures help reactants to collide with each other. 
D)  Slow reactions have high activation energies. 
E)  All of the above statements are true.

Question 15

How many nutritional Calories are in a food sample containing 550 kcal?

Accepted Answer

A)  5,500,000 
B)  550,000 
C)  5,500 
D)  550 
E)  55 
A)  5,500,000 
B)  550,000 
C)  5,500 
D)  550 
E)  55

Question 16

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

Question 17

What type of human calorimetry is the most practical, and why?

Accepted Answer

A)  direct calorimetry because it is the most accurate 
B)  indirect calorimetry because it is the most accurate 
C)  direct calorimetry because it is portable and less expensive 
D)  indirect calorimetry because it is portable and less expensive 
E)  direct and indirect calorimetry are equally practical 
A)  direct calorimetry because it is the most accurate 
B)  indirect calorimetry because it is the most accurate 
C)  direct calorimetry because it is portable and less expensive 
D)  indirect calorimetry because it is portable and less expensive 
E)  direct and indirect calorimetry are equally practical

Question 18

Atwater and Rosa built the first human calorimeter in the 1890s.After measuring the energy expenditure and food and oxygen intake of humans, they made a key discovery about the transformation of matter and energy in the human body.What discovery did they make?

Accepted Answer

A)  Amazingly, humans exert more energy than they take in. 
B)  Humans are inefficient and don't exert as much energy as they take in. 
C)  They confirmed that the conservation of energy applies to humans. 
D)  Direct calorimetry is the gold standard for accurate measurement. 
E)  All of the above were discovered. 
A)  Amazingly, humans exert more energy than they take in. 
B)  Humans are inefficient and don't exert as much energy as they take in. 
C)  They confirmed that the conservation of energy applies to humans. 
D)  Direct calorimetry is the gold standard for accurate measurement. 
E)  All of the above were discovered.

Question 19

Which bonds are broken, and which bonds are formed during this chemical reaction? 2 H2 + O2 → 2 H2O

Accepted Answer

A)  Broken: H-H and O-O Formed: O-H 
B)  Broken: H-H Formed: O-H and O-O 
C)  Broken: O-O Formed: O-H and H-H 
D)  Broken: O-H Formed: O-O and H-H 
E)  Broken: O-H Formed: O-H 
A)  Broken: H-H and O-O Formed: O-H 
B)  Broken: H-H Formed: O-H and O-O 
C)  Broken: O-O Formed: O-H and H-H 
D)  Broken: O-H Formed: O-O and H-H 
E)  Broken: O-H Formed: O-H

Question 20

The sum of bond energies of bonds broken minus the sum of bond energies of bonds formed is the definition of

Accepted Answer

A)  nutritional energy. 
B)  heat of reaction. 
C)  endothermic. 
D)  exothermic. 
E)  energy diagram. 
A)  nutritional energy. 
B)  heat of reaction. 
C)  endothermic. 
D)  exothermic. 
E)  energy diagram.

During catabolism of food, heat is released.Where does this energy go?

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

The energy difference between I and III in the diagram is called

By moving, breathing, and living, you do work every day.Work requires energy.Where does this energy come from?

Each of the following figures represents a reaction.Which reaction has the fastest rate?

Which of the following statements BEST describes catabolic pathways? I.Catabolic pathways build larger molecules from smaller ones. II)Overall, catabolic pathways release energy. III)An example of catabolism is when starch is broken down into smaller units of glucose during digestion.

Which of the following statements describes an endothermic chemical reaction?

During anabolism, heat is absorbed.What does the absorption of heat tell us about how these reactions occur?

The nutritional unit of energy is the

Compounds that are used as fuels

The chemical reaction in the diagram below is a(n)_____________ reaction.

Metabolism is

The reaction, shown below, that occurs in a hydrogen fuel cell is exothermic.According to the conservation of energy, the reverse reaction (the electrolysis of water) 2 H₂ + O₂ → 2 H₂O hydrogen fuel cell 2 H₂O → 2 H₂ + O₂ electrolysis of water

Select the TRUE statement concerning rate of reactions.

How many nutritional Calories are in a food sample containing 550 kcal?

Increasing the concentration of the reactants causes the:

What type of human calorimetry is the most practical, and why?

Atwater and Rosa built the first human calorimeter in the 1890s.After measuring the energy expenditure and food and oxygen intake of humans, they made a key discovery about the transformation of matter and energy in the human body.What discovery did they make?

Which bonds are broken, and which bonds are formed during this chemical reaction? 2 H₂ + O₂ → 2 H₂O

The sum of bond energies of bonds broken minus the sum of bond energies of bonds formed is the definition of

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

During catabolism of food, heat is released.Where does this energy go?

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

The energy difference between I and III in the diagram is called

By moving, breathing, and living, you do work every day.Work requires energy.Where does this energy come from?

Each of the following figures represents a reaction.Which reaction has the fastest rate?

Which of the following statements BEST describes catabolic pathways? I.Catabolic pathways build larger molecules from smaller ones. II)Overall, catabolic pathways release energy. III)An example of catabolism is when starch is broken down into smaller units of glucose during digestion.

Which of the following statements describes an endothermic chemical reaction?

During anabolism, heat is absorbed.What does the absorption of heat tell us about how these reactions occur?

The nutritional unit of energy is the

Compounds that are used as fuels

The chemical reaction in the diagram below is a(n)_____________ reaction.

Metabolism is

The reaction, shown below, that occurs in a hydrogen fuel cell is exothermic.According to the conservation of energy, the reverse reaction (the electrolysis of water) 2 H2 + O2 → 2 H2O hydrogen fuel cell 2 H2O → 2 H2 + O2 electrolysis of water

Select the TRUE statement concerning rate of reactions.

How many nutritional Calories are in a food sample containing 550 kcal?

Increasing the concentration of the reactants causes the:

What type of human calorimetry is the most practical, and why?

Atwater and Rosa built the first human calorimeter in the 1890s.After measuring the energy expenditure and food and oxygen intake of humans, they made a key discovery about the transformation of matter and energy in the human body.What discovery did they make?

Which bonds are broken, and which bonds are formed during this chemical reaction? 2 H2 + O2 → 2 H2O

The sum of bond energies of bonds broken minus the sum of bond energies of bonds formed is the definition of

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 reaction, shown below, that occurs in a hydrogen fuel cell is exothermic.According to the conservation of energy, the reverse reaction (the electrolysis of water) 2 H₂ + O₂ → 2 H₂O hydrogen fuel cell 2 H₂O → 2 H₂ + O₂ electrolysis of water

Which bonds are broken, and which bonds are formed during this chemical reaction? 2 H₂ + O₂ → 2 H₂O