Question 1

When an equilibrium is established, what is the relationship between the products and the reactants?

Accepted Answer

A) There is a greater concentration of products than reactants. 
B) There is a greater concentration of reactants than products. 
C) The products and reactants are equal. 
D) All of the above are possibilities.

Question 2

How is the pyruvate ion converted to the lactate ion?

Accepted Answer

A) Aerobically 
B) Anaerobically 
C) During digestion 
D) None of the above

Question 3

Why does a significant amount of lactic acid form at the normal blood pH of 7.4?

Accepted Answer

A) Because of the hydrogen ions present in blood plasma 
B) Because there is enough pyruvate to produce it 
C) Because the equilibrium in the blood favors lactic acid over lactate ion 
D) It doesn't; at 7.4 there is not enough hydrogen ion for it to form.

Question 4

How are most poisons transported through the body?

Accepted Answer

A) Via the kidneys 
B) By the respiratory system 
C) Through the lymph nodes 
D) By the circulatory system

Question 5

If the value of K for the expression As2S3(s) ⇌ 2As3+(aq) + 3S2- (aq) is very small, where does the equilibrium lie?

Accepted Answer

A) To the reactants 
B) To the products 
C) Equally between the reactants and products 
D) Entirely to one side or the other

Question 6

In the following reaction: HBr ⇌ H+ + Br- , what is [H+] equal to, given that [HBr] = 0.100 M and K = 23.1?

Accepted Answer

A) 231 M 
B) 2.31 M 
C) 1.52 M 
D) 15.2 M

Question 7

What are the entry routes to the body for a poison?

Accepted Answer

A) Ingestion 
B) Physical contact 
C) Inhalation 
D) All of the above

Question 8

What is the difference between an equilibrium constant and a binding constant?

Accepted Answer

A) The binding constant is actually determined using the equilibrium constant for a specific reaction. 
B) Equilibrium constants are always determined by the concentration of reactants. 
C) Binding constants are always determined from the formation of products. 
D) Nothing; they are the same.

Question 9

Starting with only reactants, what happens to the concentration of reactants prior to establishing an equilibrium?

Accepted Answer

A) They decrease. 
B) They increase. 
C) They essentially stay the same. 
D) Both a and c are correct.

Question 10

In the equilibrium reaction HAc ⇌ H+ + Ac-, what is the pH of the solution if [HAc] = 0.420 M and K = 4.8 × 10-8?

Accepted Answer

A) 1.42 
B) 2.02 
C) 3.85 
D) 4.80

Question 11

What is one of the main proteins found in blood plasma, to which poisons can bind?

Accepted Answer

A) Hemoglobin 
B) Albumin 
C) Retinal 
D) None of the above

Question 12

How long is it estimated that the electrolytes administered from a sports drink would take to reach muscle groups?

Accepted Answer

A) 60 seconds 
B) 10 minutes 
C) 30 minutes 
D) 60 minutes

Question 13

What is the symbol for an equilibrium reaction?

Accepted Answer

A) = 
B) ← 
C) → 
D) ⇌

Question 14

To what are muscle cramps during athletic performance often attributed?

Accepted Answer

A) Dehydration and electrolyte loss 
B) Excessive pyruvate ion formation 
C) Excessive lactate ion formation 
D) Rapid glucose depletion

Question 15

For the following reaction: HC2H3O2 ⇌ H+ + C2H3O2- , if [HC2H3O2] = 1.0 × 10-8 M and the pH = 3.0, what is K?

Accepted Answer

A) 1.0 × 10-2 
B) 10.0 
C) 1.00 × 10-6 
D) 100

Question 16

In the reaction HC2H3O2 ⇌ H+ + C2H3O2- , if [HC2H3O2] = 1.0 × 10-6 M and the pH = 4.0, what will K be?

Accepted Answer

A) 1.0 × 10-8 
B) 0.10 
C) 0.01 
D) 1.0 × 10-4

Question 17

What is the proper chemical formula for orpiment?

Accepted Answer

The answer of What is the proper chemical formula for...

Question 18

Why has arsenic been a "favorite" poison throughout history?

Accepted Answer

The answer of Why has arsenic been a "favorite" poison...

Question 19

What happens to an equilibrium when more product is introduced to the system?

Accepted Answer

A) More product is formed to establish a new equilibrium. 
B) More reactant is formed to establish a new equilibrium. 
C) More product and reactant are formed to establish a new equilibrium. 
D) None of the above.

Question 20

What does a hyperbaric oxygen chamber do?

Accepted Answer

A) Provide a clean source of oxygen and nitrogen to bind with carbon monoxide 
B) Increase the volume of the affected person's lung tissue 
C) Decreases the temperature of the person, and hence their lungs 
D) Increases the oxygen pressure to a CO-poisoned person

Exam 13: Chemical Equilibrium