Question 1

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 2

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 H?2O. 
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 H?2O. 
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 3

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

Question 4

If Jane Doe has a blood glucose (C6H12O6) concentration of 0.102 g/dL, how many glucose molecules does she have in each deciliter of blood?

Accepted Answer

A)  3.41 F1F1F1S1F1F1F10 1026 
B)  3.41 F1F1F1S1F1F1F10 1023 
C)  3.41 F1F1F1S1F1F1F10 1020 
D)  6.41 F1F1F1S1F1F1F10 1022 
E)  5.67 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104 
A)  3.41 F1F1F1S1F1F1F10 1026 
B)  3.41 F1F1F1S1F1F1F10 1023 
C)  3.41 F1F1F1S1F1F1F10 1020 
D)  6.41 F1F1F1S1F1F1F10 1022 
E)  5.67 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F104

Question 5

How many atoms of magnesium are present in the reactants of this chemical equation? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 6

The food that we eat is composed of fats, carbohydrates, and proteins. Select the choice in which each type of food is correctly paired with the number of calories in a gram of that food type.

Accepted Answer

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

Question 7

Which of the following do you expect would increase 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 
A)  adding a catalyst 
B)  decreasing temperature 
C)  decreasing concentration 
D)  removing product as it is formed 
E)  All of the above

Question 8

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 9

A spirometer is used in indirect calorimetry. What does a spirometer measure?

Accepted Answer

A)  oxygen 
B)  carbon dioxide 
C)  exhaled water 
D)  body heat 
E)  food intake 
A)  oxygen 
B)  carbon dioxide 
C)  exhaled water 
D)  body heat 
E)  food intake

Question 10

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 11

The balanced chemical equation for the combustion of butane is given below. How many grams of O2 are needed to completely react with 5.0 g of butane in a butane lighter? 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

Accepted Answer

A)  0.42 g 
B)  2.8 g 
C)  6.0 g 
D)  9.1 g 
E)  18 g 
A)  0.42 g 
B)  2.8 g 
C)  6.0 g 
D)  9.1 g 
E)  18 g

Question 12

Calculate the molecular mass of aspirin, C9H8O4.

Accepted Answer

A)  29 g/mole 
B)  126 g/mole 
C)  180. g/mole 
D)  126 amu 
E)  180. amu 
A)  29 g/mole 
B)  126 g/mole 
C)  180. g/mole 
D)  126 amu 
E)  180. amu

Question 13

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 14

Pentane (C5H12) reacts with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. What is the coefficient for carbon dioxide in the balanced equation? C5H12 + _?_ O2  → _?_ CO2 + _?_ H2O

Accepted Answer

A)  2 
B)  4 
C)  5 
D)  6 
E)  8 
A)  2 
B)  4 
C)  5 
D)  6 
E)  8

Question 15

The balanced equation for the combustion of propane is given below. What do the numbers in front of the molecules (the coefficients) mean? CH3CH2CH3 + O2 → 3 CO2 + 4 H2O

Accepted Answer

A)  Three molecules of CO2 are produced when one molecule of CH3CH2CH3 reacts with one molecule of O2. 
B)  Six molecules of CO2 are produced when two molecules of CH3CH2CH3 react with two molecules of O2. 
C)  Nine moles of CO2 are produced when three moles of CH3CH2CH3 react with three moles of O2. 
D)  Four moles of H2O are produced when one mole of CH3CH2CH3 reacts with one mole of O2. 
E)  All of the above 
A)  Three molecules of CO2 are produced when one molecule of CH3CH2CH3 reacts with one molecule of O2. 
B)  Six molecules of CO2 are produced when two molecules of CH3CH2CH3 react with two molecules of O2. 
C)  Nine moles of CO2 are produced when three moles of CH3CH2CH3 react with three moles of O2. 
D)  Four moles of H2O are produced when one mole of CH3CH2CH3 reacts with one mole of O2. 
E)  All of the above

Question 16

A chemical reaction involves many changes, but not everything changes during a reaction. Which of the following is NOT a change that occurs during a chemical reaction?

Accepted Answer

A)  Atoms change in number or identity. 
B)  Bonds break. 
C)  Heat is released and/or absorbed. 
D)  New bonds form. 
E)  New molecules are formed. 
A)  Atoms change in number or identity. 
B)  Bonds break. 
C)  Heat is released and/or absorbed. 
D)  New bonds form. 
E)  New molecules are formed.

Question 17

The following reaction is the formation of a peptide from two amino acids. This sort of reaction occurs in the body as part of the synthesis of proteins. This reaction is missing a component. Which of the following is missing? 2 NH2CH2COOH → NH2CH2CONHCH2COOH

Accepted Answer

A)  Nothing is missing. 
B)  H2O is missing from the reactant side of the equation. 
C)  H2O is missing from the product side of the equation. 
D)  O2 is missing from the reactant side of the equation. 
E)  O2 is missing from the product side of the equation. 
A)  Nothing is missing. 
B)  H2O is missing from the reactant side of the equation. 
C)  H2O is missing from the product side of the equation. 
D)  O2 is missing from the reactant side of the equation. 
E)  O2 is missing from the product side of the equation.

Question 18

A common, over-the-counter antacid is Al(OH)3. This antacid reacts with gastric juice (HCl) in the stomach, producing AlCl3 and H2O. Which of the following equations can be used to correctly determine how much gastric juice (HCl) reacts with an antacid tablet containing 0.25 grams Al(OH)3?

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 19

How many moles is 9.1 F1F1F1S1F1F1F10 1024 ions of Na+?

Accepted Answer

A)  5.5 F1F1F1S1F1F1F10 1048 moles 
B)  0.17 moles 
C)  1 mole 
D)  15 moles 
E)  0.67 moles 
A)  5.5 F1F1F1S1F1F1F10 1048 moles 
B)  0.17 moles 
C)  1 mole 
D)  15 moles 
E)  0.67 moles

Question 20

Jane Doe has a cholesterol (C27H46O) count of 178 mg/dL. You would like to calculate the number of cholesterol molecules that Jane Doe has in each deciliter of blood. Which of the following unit conversions are required to calculate the number of cholesterol molecules per deciliter? I. 10 dL II. 1 mole III. 1 g____ IV. 6.02 F1F1F1S1F1F1F10 1023 molecules
1 L 387 g 1000 mg 1 mole

Accepted Answer

A)  All of the conversions are needed. 
B)  I and IV 
C)  III and IV 
D)  I, II, and III 
E)  II, III, and IV 
A)  All of the conversions are needed. 
B)  I and IV 
C)  III and IV 
D)  I, II, and III 
E)  II, III, and IV

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

Which of the following statements describes an endothermic chemical reaction?

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

If Jane Doe has a blood glucose (C₆H₁₂O₆) concentration of 0.102 g/dL, how many glucose molecules does she have in each deciliter of blood?

How many atoms of magnesium are present in the reactants of this chemical equation? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O

The food that we eat is composed of fats, carbohydrates, and proteins. Select the choice in which each type of food is correctly paired with the number of calories in a gram of that food type.

Which of the following do you expect would increase the rate of a reaction?

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

A spirometer is used in indirect calorimetry. What does a spirometer measure?

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

The balanced chemical equation for the combustion of butane is given below. How many grams of O₂ are needed to completely react with 5.0 g of butane in a butane lighter? 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Calculate the molecular mass of aspirin, C₉H₈O₄.

Metabolism is

Pentane (C₅H₁₂) reacts with oxygen gas (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction. What is the coefficient for carbon dioxide in the balanced equation? C₅H₁₂+ _?_ O₂ → _?_ CO₂ + _?_ H₂O

The balanced equation for the combustion of propane is given below. What do the numbers in front of the molecules (the coefficients) mean? CH₃CH₂CH₃ + O₂ → 3 CO₂ + 4 H₂O

A chemical reaction involves many changes, but not everything changes during a reaction. Which of the following is NOT a change that occurs during a chemical reaction?

The following reaction is the formation of a peptide from two amino acids. This sort of reaction occurs in the body as part of the synthesis of proteins. This reaction is missing a component. Which of the following is missing? 2 NH₂CH₂COOH → NH₂CH₂CONHCH₂COOH

A common, over-the-counter antacid is Al(OH)₃. This antacid reacts with gastric juice (HCl) in the stomach, producing AlCl₃ and H₂O. Which of the following equations can be used to correctly determine how much gastric juice (HCl) reacts with an antacid tablet containing 0.25 grams Al(OH)₃?

How many moles is 9.1  10²⁴ ions of Na⁺?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 4: Chemical Quantities and Chemical Reactions

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

Which of the following statements describes an endothermic chemical reaction?

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

If Jane Doe has a blood glucose (C6H12O6) concentration of 0.102 g/dL, how many glucose molecules does she have in each deciliter of blood?

How many atoms of magnesium are present in the reactants of this chemical equation? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

The food that we eat is composed of fats, carbohydrates, and proteins. Select the choice in which each type of food is correctly paired with the number of calories in a gram of that food type.

Which of the following do you expect would increase the rate of a reaction?

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

A spirometer is used in indirect calorimetry. What does a spirometer measure?

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

The balanced chemical equation for the combustion of butane is given below. How many grams of O2 are needed to completely react with 5.0 g of butane in a butane lighter? 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

Calculate the molecular mass of aspirin, C9H8O4.

Metabolism is

Pentane (C5H12) reacts with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. What is the coefficient for carbon dioxide in the balanced equation? C5H12 + _?_ O2 → _?_ CO2 + _?_ H2O

The balanced equation for the combustion of propane is given below. What do the numbers in front of the molecules (the coefficients) mean? CH3CH2CH3 + O2 → 3 CO2 + 4 H2O

A chemical reaction involves many changes, but not everything changes during a reaction. Which of the following is NOT a change that occurs during a chemical reaction?

The following reaction is the formation of a peptide from two amino acids. This sort of reaction occurs in the body as part of the synthesis of proteins. This reaction is missing a component. Which of the following is missing? 2 NH2CH2COOH → NH2CH2CONHCH2COOH

A common, over-the-counter antacid is Al(OH)3. This antacid reacts with gastric juice (HCl) in the stomach, producing AlCl3 and H2O. Which of the following equations can be used to correctly determine how much gastric juice (HCl) reacts with an antacid tablet containing 0.25 grams Al(OH)3?

How many moles is 9.1  1024 ions of Na+?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

If Jane Doe has a blood glucose (C₆H₁₂O₆) concentration of 0.102 g/dL, how many glucose molecules does she have in each deciliter of blood?

How many atoms of magnesium are present in the reactants of this chemical equation? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O

The balanced chemical equation for the combustion of butane is given below. How many grams of O₂ are needed to completely react with 5.0 g of butane in a butane lighter? 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Calculate the molecular mass of aspirin, C₉H₈O₄.

Pentane (C₅H₁₂) reacts with oxygen gas (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction. What is the coefficient for carbon dioxide in the balanced equation? C₅H₁₂+ _?_ O₂ → _?_ CO₂ + _?_ H₂O

The balanced equation for the combustion of propane is given below. What do the numbers in front of the molecules (the coefficients) mean? CH₃CH₂CH₃ + O₂ → 3 CO₂ + 4 H₂O

The following reaction is the formation of a peptide from two amino acids. This sort of reaction occurs in the body as part of the synthesis of proteins. This reaction is missing a component. Which of the following is missing? 2 NH₂CH₂COOH → NH₂CH₂CONHCH₂COOH

A common, over-the-counter antacid is Al(OH)₃. This antacid reacts with gastric juice (HCl) in the stomach, producing AlCl₃ and H₂O. Which of the following equations can be used to correctly determine how much gastric juice (HCl) reacts with an antacid tablet containing 0.25 grams Al(OH)₃?

How many moles is 9.1  10²⁴ ions of Na⁺?