Question 1

How many atoms of oxygen 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 2

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 3

One serving of animal crackers (30 g) contains 4.5 g of fat, 22 g of carbohydrates, and 2 g of proteins. Which of the following equations would you use to determine the number of calories in one serving of animal crackers?

Accepted Answer

A)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 9 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
B)  4.5 g F1F1F1S1F1F1F10 9 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
C)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
D)  4.5 g F1F1F1S1F1F1F10 9 Cal/g + 22 g F1F1F1S1F1F1F10 9 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
E)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 9 Cal/g 
A)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 9 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
B)  4.5 g F1F1F1S1F1F1F10 9 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
C)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
D)  4.5 g F1F1F1S1F1F1F10 9 Cal/g + 22 g F1F1F1S1F1F1F10 9 Cal/g + 2 g F1F1F1S1F1F1F10 4 Cal/g 
E)  4.5 g F1F1F1S1F1F1F10 4 Cal/g + 22 g F1F1F1S1F1F1F10 4 Cal/g + 2 g F1F1F1S1F1F1F10 9 Cal/g

Question 4

Which of the following characteristics of a chemical reaction is never included in a chemical equation?

Accepted Answer

A)  the quantity of reactants 
B)  the relative proportions of reactants and products 
C)  the amount of energy absorbed or released by the reaction 
D)  the identity of the products and reactants 
E)  the physical state of the reactants and products 
A)  the quantity of reactants 
B)  the relative proportions of reactants and products 
C)  the amount of energy absorbed or released by the reaction 
D)  the identity of the products and reactants 
E)  the physical state of the reactants and products

Question 5

Which of the following molecules is known as the "energy currency of the cell"?

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 6

Acetylene (C2H2) is a small organic molecule used in the industrial preparation of many other molecules and also in welding. Acetylene is made from calcium carbide and water, resulting in acetylene and also calcium hydroxide. Which of the following choices is the correct balanced chemical equation for the preparation of acetylene?

Accepted Answer

A)  CaC2 + H2O → CaO + C2H2 
B)  CaC2 + H2O → Ca(OH)2 + C2H2 
C)  CaC2 + 2 H2O → Ca(OH)2 + C2H2 
D)  CaC2 + 2 H2O → CaO + C2H2 + H2O 
E)  2 CaC2 + H2O → Ca(OH)2 + 2 C2H2 
A)  CaC2 + H2O → CaO + C2H2 
B)  CaC2 + H2O → Ca(OH)2 + C2H2 
C)  CaC2 + 2 H2O → Ca(OH)2 + C2H2 
D)  CaC2 + 2 H2O → CaO + C2H2 + H2O 
E)  2 CaC2 + H2O → Ca(OH)2 + 2 C2H2

Question 7

The following chemical equation is not balanced. What must be done to the equation to make it balanced?

Accepted Answer

A)  Change the coefficients to: 2 for Al, 3 for CuO and 3 for Cu. 
B)  Change the subscripts of CuO to CuO3. 
C)  Add a molecule of AlO. 
D)  Change the state of matter in the reactants. 
E)  Change the subscripts of Al2O3 to be AlO. 
A)  Change the coefficients to: 2 for Al, 3 for CuO and 3 for Cu. 
B)  Change the subscripts of CuO to CuO3. 
C)  Add a molecule of AlO. 
D)  Change the state of matter in the reactants. 
E)  Change the subscripts of Al2O3 to be AlO.

Question 8

The reaction of water with ammonia is shown below. What will happen if ammonium is added to the solution when it is at equilibrium?

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 9

Which of the following statements best describes the relationship between enthalpy and reaction rate?

Accepted Answer

A)  There is no readily predictable relationship between enthalpy and reaction rate. 
B)  Exothermic reactions are always slow. 
C)  Endothermic reactions are always slow. 
D)  Enthalpy is always larger than reaction rate. 
E)  The relationship depends on whether the reaction is endo- or exothermic. 
A)  There is no readily predictable relationship between enthalpy and reaction rate. 
B)  Exothermic reactions are always slow. 
C)  Endothermic reactions are always slow. 
D)  Enthalpy is always larger than reaction rate. 
E)  The relationship depends on whether the reaction is endo- or exothermic.

Question 10

Which of the following reactions is balanced?

Accepted Answer

A)  CH3CH2CH3 + O2 → CO2 + H2O 
B)  CH3CH2CH3 + O2 → 3 CO2 + 4 H2O 
C)  CH3CH2CH3 + 10 O2 → 3 CO2 + 4 H2O 
D)  CH3CH2CH3 + 5 O2 → 3 CO2 + 4 H2O 
E)  None of these are balanced. 
A)  CH3CH2CH3 + O2 → CO2 + H2O 
B)  CH3CH2CH3 + O2 → 3 CO2 + 4 H2O 
C)  CH3CH2CH3 + 10 O2 → 3 CO2 + 4 H2O 
D)  CH3CH2CH3 + 5 O2 → 3 CO2 + 4 H2O 
E)  None of these are balanced.

Question 11

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.

Question 12

Which bonds are broken over the course of this chemical reaction and which bonds are formed?

Accepted Answer

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

Question 13

The following reaction is a reversible reaction. Which of the following statements 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 14

The balanced chemical equation for the combustion of propane (C3H8) is given below. How many grams of carbon dioxide (CO2) are released when 35 g of propane are burned in the presence of excess oxygen? C3H8 + 5 O2 → 3 CO2 + 4 H2O

Accepted Answer

A)  0.80 g 
B)  12 g 
C)  35 g 
D)  105 g 
E)  1500 g 
A)  0.80 g 
B)  12 g 
C)  35 g 
D)  105 g 
E)  1500 g

Question 15

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 16

How is a biochemical pathway different than a biochemical reaction?

Accepted Answer

A)  Actually, they are identical. 
B)  Only pathways occur in cells, not reactions. 
C)  Only reactions occur in cells, not pathways. 
D)  Reactions are catabolic and pathways are anabolic. 
E)  A pathway is a specific sequence of reactions. 
A)  Actually, they are identical. 
B)  Only pathways occur in cells, not reactions. 
C)  Only reactions occur in cells, not pathways. 
D)  Reactions are catabolic and pathways are anabolic. 
E)  A pathway is a specific sequence of reactions.

Question 17

What are the products of the reaction illustrated in Figure I?

Accepted Answer

A)  CH4 and O2 
B)  CO2 and H2O 
C)  CH4 only 
D)  O2 only 
E)  CO2 only 
A)  CH4 and O2 
B)  CO2 and H2O 
C)  CH4 only 
D)  O2 only 
E)  CO2 only

Question 18

The reaction that occurs in a hydrogen fuel cell, shown below, is exothermic. According to the Conservation of Energy, the reverse reaction, called electrolysis, 2H2 + O2 → 2H2O hydrogen fuel cell
2H2O → 2H2 + O2 electrolysis

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 19

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 water in the balanced equation?

Accepted Answer

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

Question 20

Which of the following biological molecules are the major nutrients that make up the food that we eat? 
I. proteins
II. nucleic acids
III. steroids
IV. fats
V. carbohydrates

Accepted Answer

A)  All of these are major nutrients. 
B)  I, II, IV, and V 
C)  I and V 
D)  III, IV, and V 
E)  I, IV, and V 
A)  All of these are major nutrients. 
B)  I, II, IV, and V 
C)  I and V 
D)  III, IV, and V 
E)  I, IV, and V

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

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?

One serving of animal crackers (30 g) contains 4.5 g of fat, 22 g of carbohydrates, and 2 g of proteins. Which of the following equations would you use to determine the number of calories in one serving of animal crackers?

Which of the following characteristics of a chemical reaction is never included in a chemical equation?

Which of the following molecules is known as the "energy currency of the cell"?

The following chemical equation is not balanced. What must be done to the equation to make it balanced?

The reaction of water with ammonia is shown below. What will happen if ammonium is added to the solution when it is at equilibrium?

Which of the following statements best describes the relationship between enthalpy and reaction rate?

Which of the following reactions is balanced?

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

Which bonds are broken over the course of this chemical reaction and which bonds are formed?

The following reaction is a reversible reaction. Which of the following statements best describes what it means for this reaction to be reversible? HCOOH + HOCH₃ HCOOCH₃ + H₂O

The balanced chemical equation for the combustion of propane (C₃H₈) is given below. How many grams of carbon dioxide (CO₂) are released when 35 g of propane are burned in the presence of excess oxygen? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

What is a biochemical pathway?

How is a biochemical pathway different than a biochemical reaction?

What are the products of the reaction illustrated in Figure I?

The reaction that occurs in a hydrogen fuel cell, shown below, is exothermic. According to the Conservation of Energy, the reverse reaction, called electrolysis, 2H₂+ O₂ → 2H₂O hydrogen fuel cell 2H₂O → 2H₂+ O₂ electrolysis

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 water in the balanced equation?

Which of the following biological molecules are the major nutrients that make up the food that we eat? I. proteins II. nucleic acids III. steroids IV. fats V. carbohydrates

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

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

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?

One serving of animal crackers (30 g) contains 4.5 g of fat, 22 g of carbohydrates, and 2 g of proteins. Which of the following equations would you use to determine the number of calories in one serving of animal crackers?

Which of the following characteristics of a chemical reaction is never included in a chemical equation?

Which of the following molecules is known as the "energy currency of the cell"?

The following chemical equation is not balanced. What must be done to the equation to make it balanced?

The reaction of water with ammonia is shown below. What will happen if ammonium is added to the solution when it is at equilibrium?

Which of the following statements best describes the relationship between enthalpy and reaction rate?

Which of the following reactions is balanced?

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

Which bonds are broken over the course of this chemical reaction and which bonds are formed?

The following reaction is a reversible reaction. Which of the following statements best describes what it means for this reaction to be reversible? HCOOH + HOCH3 HCOOCH3 + H2O

The balanced chemical equation for the combustion of propane (C3H8) is given below. How many grams of carbon dioxide (CO2) are released when 35 g of propane are burned in the presence of excess oxygen? C3H8 + 5 O2 → 3 CO2 + 4 H2O

What is a biochemical pathway?

How is a biochemical pathway different than a biochemical reaction?

What are the products of the reaction illustrated in Figure I?

The reaction that occurs in a hydrogen fuel cell, shown below, is exothermic. According to the Conservation of Energy, the reverse reaction, called electrolysis, 2H2 + O2 → 2H2O hydrogen fuel cell 2H2O → 2H2 + O2 electrolysis

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 water in the balanced equation?

Which of the following biological molecules are the major nutrients that make up the food that we eat? I. proteins II. nucleic acids III. steroids IV. fats V. carbohydrates

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

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

The following reaction is a reversible reaction. Which of the following statements best describes what it means for this reaction to be reversible? HCOOH + HOCH₃ HCOOCH₃ + H₂O

The balanced chemical equation for the combustion of propane (C₃H₈) is given below. How many grams of carbon dioxide (CO₂) are released when 35 g of propane are burned in the presence of excess oxygen? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

The reaction that occurs in a hydrogen fuel cell, shown below, is exothermic. According to the Conservation of Energy, the reverse reaction, called electrolysis, 2H₂+ O₂ → 2H₂O hydrogen fuel cell 2H₂O → 2H₂+ O₂ electrolysis

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 water in the balanced equation?