Question 1

An endothermic reaction is one in which energy is absorbed and $\Delta$H is negative (-).

Accepted Answer

A) True 
 B)False

Question 2

The reversible reaction: PCl3(g)+ Cl2(g)   PCl5(g), has K = 0.5. Based on the molecular art shown below, what can be inferred about the reaction conditions?

Accepted Answer

A) The reaction has not yet reached equilibrium. 
B) The reaction mixture is at equilibrium. 
C) The reaction will shift to the left to reach equilibrium. 
D) The forward reaction is favorable. 
A) The reaction has not yet reached equilibrium. 
B) The reaction mixture is at equilibrium. 
C) The reaction will shift to the left to reach equilibrium. 
D) The forward reaction is favorable.

Question 3

Consider the reaction: C3H8(g)+ 5 O2(g)$\rightarrow$ 3 CO2(g)+ 4 H2O(g), where $\Delta$H = -531 kcal. Which statement concerning this reaction is true?

Accepted Answer

A) Heat is absorbed. 
B) The bonds formed in the products are stronger than the bonds broken in the reactants. 
C) The products are higher in energy than the reactants. 
D) The reaction is endothermic. 
A) Heat is absorbed. 
B) The bonds formed in the products are stronger than the bonds broken in the reactants. 
C) The products are higher in energy than the reactants. 
D) The reaction is endothermic.

Question 4

Breaking a chemical bond requires energy.

Accepted Answer

A) True 
 B)False

Question 5

Catalysts accelerate a reaction by

Accepted Answer

A) lowering the enthalpy of the reaction. 
B) lowering the energy of activation. 
C) raising the enthalpy of the reaction. 
D) raising the energy of activation. 
A) lowering the enthalpy of the reaction. 
B) lowering the energy of activation. 
C) raising the enthalpy of the reaction. 
D) raising the energy of activation.

Question 6

When the equilibrium constant for a reversible reaction is much greater than one (K > 1), the equilibrium is said to lie to the right.

Accepted Answer

A) True 
 B)False

Question 7

Consider the combustion reaction of propane: C3H8(g)+ 5 O2(g)$\rightarrow$ 3 CO2(g)+ 4 H2O(g), where $\Delta$H = -531 kcal. If 1.24 × 105 kcal of energy is released in the reaction, how many moles of propane were burned?

Accepted Answer

A) 234 mol of C3H8 
B) 6.58 × 107 mol of C3H8 
C) 0.00428 mol of C3H8 
D) 0.0179 mol of C3H8 
A) 234 mol of C3H8 
B) 6.58 × 107 mol of C3H8 
C) 0.00428 mol of C3H8 
D) 0.0179 mol of C3H8

Question 8

The hydrolysis of sucrose depicted below has K = 1.4 × 105. Which of the following is a reasonable assumption about this reaction once equilibrium is established? sucrose + H2O   glucose + fructose

Accepted Answer

A) The equilibrium mixture contains equal amounts of sucrose, glucose, and fructose. 
B) The equilibrium mixture contains mostly glucose and fructose. 
C) The equilibrium mixture contains mostly sucrose. 
D) The equilibrium shifts to the left due to the high value for K. 
A) The equilibrium mixture contains equal amounts of sucrose, glucose, and fructose. 
B) The equilibrium mixture contains mostly glucose and fructose. 
C) The equilibrium mixture contains mostly sucrose. 
D) The equilibrium shifts to the left due to the high value for K.

An endothermic reaction is one in which energy is absorbed and $\Delta$ H is negative (-).

The reversible reaction: PCl₃(g)+ Cl₂(g) PCl₅(g), has K = 0.5. Based on the molecular art shown below, what can be inferred about the reaction conditions?

Consider the reaction: C₃H₈(g)+ 5 O₂(g) $\rightarrow$ 3 CO₂(g)+ 4 H₂O(g), where $\Delta$ H = -531 kcal. Which statement concerning this reaction is true?

Breaking a chemical bond requires energy.

Catalysts accelerate a reaction by

When the equilibrium constant for a reversible reaction is much greater than one (K > 1), the equilibrium is said to lie to the right.

Consider the combustion reaction of propane: C₃H₈(g)+ 5 O₂(g) $\rightarrow$ 3 CO₂(g)+ 4 H₂O(g), where $\Delta$ H = -531 kcal. If 1.24 × 10⁵ kcal of energy is released in the reaction, how many moles of propane were burned?

The hydrolysis of sucrose depicted below has K = 1.4 × 10⁵. Which of the following is a reasonable assumption about this reaction once equilibrium is established? sucrose + H₂O glucose + fructose

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

Exam 6: Energy Changes, Reaction Rates, and Equilibrium

An endothermic reaction is one in which energy is absorbed and Δ\DeltaΔ H is negative (-).

The reversible reaction: PCl3(g)+ Cl2(g) PCl5(g), has K = 0.5. Based on the molecular art shown below, what can be inferred about the reaction conditions?

Consider the reaction: C3H8(g)+ 5 O2(g) →\rightarrow→ 3 CO2(g)+ 4 H2O(g), where Δ\DeltaΔ H = -531 kcal. Which statement concerning this reaction is true?

Breaking a chemical bond requires energy.

Catalysts accelerate a reaction by

When the equilibrium constant for a reversible reaction is much greater than one (K > 1), the equilibrium is said to lie to the right.

Consider the combustion reaction of propane: C3H8(g)+ 5 O2(g) →\rightarrow→ 3 CO2(g)+ 4 H2O(g), where Δ\DeltaΔ H = -531 kcal. If 1.24 × 105 kcal of energy is released in the reaction, how many moles of propane were burned?

The hydrolysis of sucrose depicted below has K = 1.4 × 105. Which of the following is a reasonable assumption about this reaction once equilibrium is established? sucrose + H2O glucose + fructose

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

An endothermic reaction is one in which energy is absorbed and $\Delta$ H is negative (-).

The reversible reaction: PCl₃(g)+ Cl₂(g) PCl₅(g), has K = 0.5. Based on the molecular art shown below, what can be inferred about the reaction conditions?

Consider the reaction: C₃H₈(g)+ 5 O₂(g) $\rightarrow$ 3 CO₂(g)+ 4 H₂O(g), where $\Delta$ H = -531 kcal. Which statement concerning this reaction is true?

Consider the combustion reaction of propane: C₃H₈(g)+ 5 O₂(g) $\rightarrow$ 3 CO₂(g)+ 4 H₂O(g), where $\Delta$ H = -531 kcal. If 1.24 × 10⁵ kcal of energy is released in the reaction, how many moles of propane were burned?

The hydrolysis of sucrose depicted below has K = 1.4 × 10⁵. Which of the following is a reasonable assumption about this reaction once equilibrium is established? sucrose + H₂O glucose + fructose