Question 1

Which statement is the BEST definition of chemical equilibrium?

Accepted Answer

A)  the point at which the mass of reaction products equals the mass of the reactants 
B)  the point at which forward and reverse reactions proceed at the same rate 
C)  the point at which a reaction is balanced 
D)  the point at which the number of moles of product equals the number of moles of reactants 
E)  Both answers b and d correctly define equilibrium. 
A)  the point at which the mass of reaction products equals the mass of the reactants 
B)  the point at which forward and reverse reactions proceed at the same rate 
C)  the point at which a reaction is balanced 
D)  the point at which the number of moles of product equals the number of moles of reactants 
E)  Both answers b and d correctly define equilibrium.

Question 2

Which of the following molecules is a special energy carrier molecule?

Accepted Answer

A)  DNA 
B)  adenosine triphosphate 
C)  citric acid 
D)  insulin 
E)  starch 
A)  DNA 
B)  adenosine triphosphate 
C)  citric acid 
D)  insulin 
E)  starch

Question 3

Which of the following diagrams illustrates an endothermic reaction?

Accepted Answer

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

Question 4

How does direct and indirect calorimetry differ?

Accepted Answer

A)  Direct measures food intake, and indirect measures energy output. 
B)  Direct measures energy output, and indirect measures food intake. 
C)  Direct measures energy output, and indirect measures oxygen intake. 
D)  Direct measures oxygen intake, and indirect measures energy output. 
E)  Direct measures oxygen intake, and indirect measures oxygen output. 
A)  Direct measures food intake, and indirect measures energy output. 
B)  Direct measures energy output, and indirect measures food intake. 
C)  Direct measures energy output, and indirect measures oxygen intake. 
D)  Direct measures oxygen intake, and indirect measures energy output. 
E)  Direct measures oxygen intake, and indirect measures oxygen output.

Question 5

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

Question 6

Select the correct statement regarding the reactants and products in the reaction represented by the energy diagram below.

Accepted Answer

A)  The products have more energy than the reactants. 
B)  The reactants are more stable than the products. 
C)  The products are more stable than the reactants. 
D)  The reactants and products have the same energy. 
E)  The products are less stable than the reactants. 
A)  The products have more energy than the reactants. 
B)  The reactants are more stable than the products. 
C)  The products are more stable than the reactants. 
D)  The reactants and products have the same energy. 
E)  The products are less stable than the reactants.

Question 7

Which of the following reactions could be described by the energy diagram below?

Accepted Answer

A)  2 CO2 + 556 kJ→ 2 CO + O2 
B)  CH4 + 2 O2 → CO2 + 2 H2O + heat 
C)  8 H2S + heat → 8 H2 + S8 
D)  6 CO2 + 6 H2O + heat → C6H12O6 + 6 O2 
E)  All of the reactions can be described by this energy diagram. 
A)  2 CO2 + 556 kJ→ 2 CO + O2 
B)  CH4 + 2 O2 → CO2 + 2 H2O + heat 
C)  8 H2S + heat → 8 H2 + S8 
D)  6 CO2 + 6 H2O + heat → C6H12O6 + 6 O2 
E)  All of the reactions can be described by this energy diagram.

Question 8

Which of the following is a potential consequence of misjudging the caloric needs of a patient?

Accepted Answer

A)  malnourishment 
B)  muscle fatigue 
C)  respiratory failure 
D)  coma 
E)  All of the above are consequences. 
A)  malnourishment 
B)  muscle fatigue 
C)  respiratory failure 
D)  coma 
E)  All of the above are consequences.

Question 9

Which process that occurs during this reaction gives off heat? 2 H2 + O2 → 2 H2O

Accepted Answer

A)  breaking H-H 
B)  breaking O-O 
C)  breaking O-H 
D)  forming O-H 
E)  both breaking and forming bonds 
A)  breaking H-H 
B)  breaking O-O 
C)  breaking O-H 
D)  forming O-H 
E)  both breaking and forming bonds

Question 10

The energy difference between I and II 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 11

The first law of thermodynamics states that

Accepted Answer

A)  atoms are neither created nor destroyed during a chemical reaction. 
B)  energy is created when reactions release energy. 
C)  energy is conserved. 
D)  atoms are destroyed to produce energy from a chemical reaction. 
E)  kinetic energy is conserved but potential energy is not. 
A)  atoms are neither created nor destroyed during a chemical reaction. 
B)  energy is created when reactions release energy. 
C)  energy is conserved. 
D)  atoms are destroyed to produce energy from a chemical reaction. 
E)  kinetic energy is conserved but potential energy is not.

Question 12

What is a biochemical pathway?

Accepted Answer

A)  the path that nutrients take through the body when they are metabolized 
B)  the complex blood transport system 
C)  a chemical reaction in the body that releases energy 
D)  a chemical reaction that releases carbon dioxide 
E)  a particular sequence of chemical reactions in the body 
A)  the path that nutrients take through the body when they are metabolized 
B)  the complex blood transport system 
C)  a chemical reaction in the body that releases energy 
D)  a chemical reaction that releases carbon dioxide 
E)  a particular sequence of chemical reactions in the body

Question 13

How does increasing the temperature of a reaction affect the reaction rate?

Accepted Answer

A)  It slows the rate down by changing the heat of reaction. 
B)  It speeds the rate up by raising the activation energy. 
C)  It slows the rate down by increasing the activation energy. 
D)  It speeds the rate up by increasing the kinetic energy of the molecules. 
E)  It slows the rate down by increasing the kinetic energy of the molecules. 
A)  It slows the rate down by changing the heat of reaction. 
B)  It speeds the rate up by raising the activation energy. 
C)  It slows the rate down by increasing the activation energy. 
D)  It speeds the rate up by increasing the kinetic energy of the molecules. 
E)  It slows the rate down by increasing the kinetic energy of the molecules.

Question 14

The reaction between acetic acid (CH3COOH)and methanol (CH3OH)is given below, followed by a list of changes that could be made to the reaction.Which of these changes will result in the equilibrium shifting to the left? CH3COOH + CH3OH ⇌ CH3COOCH3 + H2O
Changes that could be made to the solution
I.Adding more CH3COOH
II.Removing H2O
III.Adding more CH3COOCH3
IV.Removing CH3OH

Accepted Answer

A)  All of these changes will result in the equilibrium shifting to the left. 
B)  Only I will result in the equilibrium shifting to the left. 
C)  Only IV will result in the equilibrium shifting to the left. 
D)  I and III will result in the equilibrium shifting to the left. 
E)  III and IV will result in the equilibrium shifting to the left. 
A)  All of these changes will result in the equilibrium shifting to the left. 
B)  Only I will result in the equilibrium shifting to the left. 
C)  Only IV will result in the equilibrium shifting to the left. 
D)  I and III will result in the equilibrium shifting to the left. 
E)  III and IV will result in the equilibrium shifting to the left.

Question 15

Which of the following reactions releases the smallest amount of heat?

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 16

One serving (45 g)of dry wild rice contains 1.5 g of fat, 35 g of carbohydrates, and 5 g of protein.How many Calories does a serving of wild rice contain?

Accepted Answer

A)  166 Calories 
B)  170 Calories 
C)  200 Calories 
D)  340 Calories 
E)  370 Calories 
A)  166 Calories 
B)  170 Calories 
C)  200 Calories 
D)  340 Calories 
E)  370 Calories

Question 17

The name for the heat energy released or absorbed in a chemical reaction is

Accepted Answer

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

Question 18

How many calories are in a food labeled as containing 230 Calories?

Accepted Answer

A)  230 
B)  2,300 
C)  23,000 
D)  230,000 
E)  2,300,000 
A)  230 
B)  2,300 
C)  23,000 
D)  230,000 
E)  2,300,000

Question 19

An overview of metabolism is shown in the following figure.What does this figure tell us about the energy of catabolism and anabolism?

Accepted Answer

A)  Anabolic reactions occur more quickly than catabolic reactions. 
B)  Catabolism is exothermic, and anabolism is endothermic. 
C)  Overall, we exert more energy than we consume. 
D)  Overall, the amount of energy that goes into anabolic processes is the same as is released in catabolic processes. 
E)  The conservation of energy does not apply to biological systems. 
A)  Anabolic reactions occur more quickly than catabolic reactions. 
B)  Catabolism is exothermic, and anabolism is endothermic. 
C)  Overall, we exert more energy than we consume. 
D)  Overall, the amount of energy that goes into anabolic processes is the same as is released in catabolic processes. 
E)  The conservation of energy does not apply to biological systems.

Question 20

In an exothermic reaction, the reactants are higher in energy than the products.What is the meaning of this difference in energy?

Accepted Answer

A)  The products are more stable than the reactants. 
B)  The reactants have stronger bonds than the products. 
C)  The reactants have a lower potential energy than the products. 
D)  The bond energies of the products are less than the bond energies of the reactants. 
E)  The reactants are more stable than the products. 
A)  The products are more stable than the reactants. 
B)  The reactants have stronger bonds than the products. 
C)  The reactants have a lower potential energy than the products. 
D)  The bond energies of the products are less than the bond energies of the reactants. 
E)  The reactants are more stable than the products.

Which statement is the BEST definition of chemical equilibrium?

Which of the following molecules is a special energy carrier molecule?

Which of the following diagrams illustrates an endothermic reaction?

How does direct and indirect calorimetry differ?

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

Select the correct statement regarding the reactants and products in the reaction represented by the energy diagram below.

Which of the following reactions could be described by the energy diagram below?

Which of the following is a potential consequence of misjudging the caloric needs of a patient?

Which process that occurs during this reaction gives off heat? 2 H₂ + O₂ → 2 H₂O

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

The first law of thermodynamics states that

What is a biochemical pathway?

How does increasing the temperature of a reaction affect the reaction rate?

Which of the following reactions releases the smallest amount of heat?

One serving (45 g)of dry wild rice contains 1.5 g of fat, 35 g of carbohydrates, and 5 g of protein.How many Calories does a serving of wild rice contain?

The name for the heat energy released or absorbed in a chemical reaction is

How many calories are in a food labeled as containing 230 Calories?

An overview of metabolism is shown in the following figure.What does this figure tell us about the energy of catabolism and anabolism?

In an exothermic reaction, the reactants are higher in energy than the products.What is the meaning of this difference in energy?

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 is the BEST definition of chemical equilibrium?

Which of the following molecules is a special energy carrier molecule?

Which of the following diagrams illustrates an endothermic reaction?

How does direct and indirect calorimetry differ?

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

Select the correct statement regarding the reactants and products in the reaction represented by the energy diagram below.

Which of the following reactions could be described by the energy diagram below?

Which of the following is a potential consequence of misjudging the caloric needs of a patient?

Which process that occurs during this reaction gives off heat? 2 H2 + O2 → 2 H2O

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

The first law of thermodynamics states that

What is a biochemical pathway?

How does increasing the temperature of a reaction affect the reaction rate?

Which of the following reactions releases the smallest amount of heat?

One serving (45 g)of dry wild rice contains 1.5 g of fat, 35 g of carbohydrates, and 5 g of protein.How many Calories does a serving of wild rice contain?

The name for the heat energy released or absorbed in a chemical reaction is

How many calories are in a food labeled as containing 230 Calories?

An overview of metabolism is shown in the following figure.What does this figure tell us about the energy of catabolism and anabolism?

In an exothermic reaction, the reactants are higher in energy than the products.What is the meaning of this difference in energy?

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

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

Which process that occurs during this reaction gives off heat? 2 H₂ + O₂ → 2 H₂O