Question 1

The function of a catalyst in a reaction system is to

Accepted Answer

A) increase the yield of product. 
B) decrease the amount of heat produced. 
C) decrease the amount of energy consumed in the reaction. 
D) increase the rate of the reaction. 
E) decrease the amount of reactants consumed. 
A) increase the yield of product. 
B) decrease the amount of heat produced. 
C) decrease the amount of energy consumed in the reaction. 
D) increase the rate of the reaction. 
E) decrease the amount of reactants consumed.

Question 2

A process which is unfavorable with respect to enthalpy,but favorable with respect to entropy

Accepted Answer

A) could occur at low temperatures,but not at higher temperatures. 
B) could occur at high temperatures,but not at lower temperatures. 
C) could not occur regardless of temperature. 
D) could occur at any temperature. 
E) none of the above 
A) could occur at low temperatures,but not at higher temperatures. 
B) could occur at high temperatures,but not at lower temperatures. 
C) could not occur regardless of temperature. 
D) could occur at any temperature. 
E) none of the above

Question 3

Which of the following will affect all reaction rates?

Accepted Answer

A) the temperature of the reactants 
B) the concentrations of the reactants 
C) the presence of a catalyst 
D) All are correct. 
A) the temperature of the reactants 
B) the concentrations of the reactants 
C) the presence of a catalyst 
D) All are correct.

Question 4

Match the following.
-A process or reaction that has a negative value of ΔG

Accepted Answer

A) exergonic 
B) endergonic 
C) exothermic 
D) endothermic 
E) activation energy
F)chemical equilibrium 
A) exergonic 
B) endergonic 
C) exothermic 
D) endothermic 
E) activation energy
F)chemical equilibrium

Question 5

Sketch a diagram to illustrate the role of orientation in determining whether a collision between molecules of two different diatomic elements will lead to formation of a compound.How could you illustrate the influence of energy considerations on this reaction?

Accepted Answer

The diagram should show the two diatomic

Question 6

For the following reaction,increasing the pressure will cause the equilibrium to ________.
2 SO2 (g)+ O2 (g)  
2 SO3 (g)+ heat

Accepted Answer

A) shift to the right,towards products 
B) shift to the left,towards reactants 
C) remain unchanged,but the reaction mixture will get warmer 
D) remain unchanged,but the reaction mixture will get cooler 
E) Pressure has no effect on equilibrium. 
A) shift to the right,towards products 
B) shift to the left,towards reactants 
C) remain unchanged,but the reaction mixture will get warmer 
D) remain unchanged,but the reaction mixture will get cooler 
E) Pressure has no effect on equilibrium.

Question 7

Match the following.
-A process or reaction which releases heat

Accepted Answer

A) exergonic 
B) endergonic 
C) exothermic 
D) endothermic 
E) activation energy
F)chemical equilibrium 
A) exergonic 
B) endergonic 
C) exothermic 
D) endothermic 
E) activation energy
F)chemical equilibrium

Question 8

Which of the following statements can be assumed to be true about how reactions occur?

Accepted Answer

A) Catalysts must be present in the reaction. 
B) Energy must be absorbed as the reaction proceeds. 
C) Reactant particles must collide with each other. 
D) More than one statement can be true. 
A) Catalysts must be present in the reaction. 
B) Energy must be absorbed as the reaction proceeds. 
C) Reactant particles must collide with each other. 
D) More than one statement can be true.

Question 9

S + O2 → SO2 ΔH = -70.8 kcal
Based on the reaction shown,which statement is true?

Accepted Answer

A) 70.8 kcal are produced when 1 g of sulfur reacts. 
B) 70.8 kcal are consumed when 1 g of sulfur reacts. 
C) 70.8 kcal are produced when 32.1 g of sulfur reacts. 
D) 70.8 kcal are consumed when 32.1 g of sulfur reacts. 
E) 70.8 kcal are produced when 1 g of sulfur dioxide is produced. 
A) 70.8 kcal are produced when 1 g of sulfur reacts. 
B) 70.8 kcal are consumed when 1 g of sulfur reacts. 
C) 70.8 kcal are produced when 32.1 g of sulfur reacts. 
D) 70.8 kcal are consumed when 32.1 g of sulfur reacts. 
E) 70.8 kcal are produced when 1 g of sulfur dioxide is produced.

Question 10

Consider the reaction shown:
N2 + O2 → 2 NO ΔH = 43.2 kcal
When 50.0 g of N2 react,________ kcal will be ________.

Accepted Answer

A) 43.2; produced 
B) 77.1; consumed 
C) 77.1; produced 
D) 2160; consumed 
E) 2160; produced 
A) 43.2; produced 
B) 77.1; consumed 
C) 77.1; produced 
D) 2160; consumed 
E) 2160; produced

Question 11

A process or reaction which releases heat to the surroundings is said to be

Accepted Answer

A) conservative. 
B) endothermic. 
C) exothermic. 
D) isothermal. 
E) exergonic. 
A) conservative. 
B) endothermic. 
C) exothermic. 
D) isothermal. 
E) exergonic.

Question 12

-For a chemical reaction to occur,all of the following must happen except

Accepted Answer

A) chemical bonds in the reactants must break. 
B) reactant particles must collide with enough energy for change to occur. 
C) reactant particles must collide with the correct orientation. 
D) a large enough number of collisions must occur. 
E) chemical bonds in the products must form. 
A) chemical bonds in the reactants must break. 
B) reactant particles must collide with enough energy for change to occur. 
C) reactant particles must collide with the correct orientation. 
D) a large enough number of collisions must occur. 
E) chemical bonds in the products must form.

Question 13

Entropy can be defined as

Accepted Answer

A) the amount of energy required to rearrange chemical bonds. 
B) the amount of energy required to initiate a reaction. 
C) the number of chemical bonds which are changed during a reaction. 
D) the state of equilibrium in a system. 
E) the amount of disorder in a system. 
A) the amount of energy required to rearrange chemical bonds. 
B) the amount of energy required to initiate a reaction. 
C) the number of chemical bonds which are changed during a reaction. 
D) the state of equilibrium in a system. 
E) the amount of disorder in a system.

Exam 7: Chemical Reactions: Energy, rates, and Equilibrium

The function of a catalyst in a reaction system is to

A process which is unfavorable with respect to enthalpy,but favorable with respect to entropy

Which of the following will affect all reaction rates?

Match the following. -A process or reaction that has a negative value of ΔG

Sketch a diagram to illustrate the role of orientation in determining whether a collision between molecules of two different diatomic elements will lead to formation of a compound.How could you illustrate the influence of energy considerations on this reaction?

For the following reaction,increasing the pressure will cause the equilibrium to ________. 2 SO2 (g)+ O2 (g) 2 SO3 (g)+ heat

Match the following. -A process or reaction which releases heat

Which of the following statements can be assumed to be true about how reactions occur?

S + O2 → SO2 ΔH = -70.8 kcal Based on the reaction shown,which statement is true?

Consider the reaction shown: N2 + O2 → 2 NO ΔH = 43.2 kcal When 50.0 g of N2 react,________ kcal will be ________.

A process or reaction which releases heat to the surroundings is said to be

-For a chemical reaction to occur,all of the following must happen except

Entropy can be defined as

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

For the following reaction,increasing the pressure will cause the equilibrium to ________. 2 SO₂ (g)+ O₂ (g) 2 SO₃ (g)+ heat

S + O₂ → SO₂ ΔH = -70.8 kcal Based on the reaction shown,which statement is true?

Consider the reaction shown: N₂ + O₂ → 2 NO ΔH = 43.2 kcal When 50.0 g of N₂ react, kcal will be .