Deck 13: Chemical Equilibrium and Poisons

Question 1

Which classification contains substances that decompose the protein molecules that make up your body?

A) carcinogen
B) corrosive
C) mutagen
D) teratogen

Answer 1

corrosive

Question 2

Which of the following refers to a naturally occurring poisonous substance produced by a living organism?

A) mutagen
B) poison
C) teratogen
D) toxin

Answer 2

toxin

Question 3

How does the presence of a catalyst affect equilibrium?

A) It decreases the amount of time it takes for the reaction to reach equilibrium.
B) It increases the amount of time it takes for the reaction to reach equilibrium.
C) It does not change the amount of time it takes for the reaction to reach equilibrium.

Answer 3

It decreases the amount of time it takes for the reaction to reach equilibrium.

Question 4

Given the following list of K_a values, determine which weak acid solution would have the lowest pH value at equilibrium assuming all acids have the same initial concentration. ​

A) HIO₃
B) H₂C₆H₆O₆
C) H₂O₂
D) H₃AsO₄

Question 5

Determine the equilibrium concentration of bromide when the lead concentration is 2.8 × 10^-3 M. The K_sp of PbBr₂ is 6.60 × 10^-6.

A) 0.0024 M
B) 0.049 M
C) 1.2 M
D) 424 M

Question 6

Which of the following refers to a substance that alters the DNA of cells in the parent, which can cause disease in offspring?

A) carcinogen
B) mutagen
C) poison
D) teratogen

Question 7

Determine the equilibrium concentration of cadmium when the carbonate concentration is 5.4 × 10^-7 M. The K_sp for CdCO₃ is 1.0 × 10^-12.

A) 5.4 × 10^-19 M
B) 1.9 × 10^-6 M
C) 5.4 × 10⁵ M
D) 6.8 × 10⁸ M

Question 8

Which of the following describes how a system at equilibrium will respond to a decrease in product concentration?

A) The equilibrium will shift to the left.
B) The equilibrium will shift to the right.
C) The equilibrium will not shift to either the right or the left.

Question 9

Given the following K_sp values, determine which solution has the greatest concentration of ions at equilibrium. ​

​

A) MgCO₃
B) AgCl
C) Ag(CH₃COO)
D) Sr₃(PO₄)₂

Question 10

All the reactants are completely changed to products in chemical reactions.

Question 11

Which conditions are present when K is very large?

A) low concentrations of both products and reactants
B) high concentrations of both products and reactants
C) high concentration of reactants and low concentration of products
D) high concentration of products and low concentration of reactants

Question 12

Is the LD₅₀ a measurement for acute poisoning or chronic poisoning?

A) acute
B) chronic

Question 13

Which of the following describes how a system at equilibrium will respond to an increase in reactant concentration?

A) The equilibrium will shift to the left.
B) The equilibrium will shift to the right.
C) The equilibrium will not shift to either the right or the left.

Question 14

Determine the solubility equilibrium constant for CaF₂ given that the equilibrium concentration of [Ca²⁺] = 0.00039 M and [F^-] = 0.00032 M. K_sp = ______________

Question 15

Which statement is true for a reaction at dynamic equilibrium?

A) The temperature is constant.
B) The forward and reverse reactions are both occurring.
C) The concentrations of the products and reactants are equal.
D) The concentrations of the products and reactants are constant.

Question 16

Which statement describes when dynamic equilibrium occurs?

A) Only the reverse reaction occurs.
B) Only the forward reaction occurs.
C) The rate of the forward and reverse reactions is equal.
D) The rate of the forward and the reverse reactions is zero.

Question 17

Given the following K_sp values, determine which solution has the smallest concentration of ions at equilibrium. ​

A) CuC₂O₄
B) Co(OH)₂
C) Ag₂SO₄
D) Hg₂I₂

Question 18

Given the following list of K_a values, determine which weak acid solution would have the highest pH value at equilibrium assuming all acids have the same initial concentration. ​

A) HC₂O₄^-
B) HSO₄^-
C) H₂PO₄^-
D) H₂AsO₄^-

Question 19

Carbon monoxide poisoning occurs when hemoglobin binds to the carbon monoxide as shown:
HbO₂ + CO ⇌ HbCO + O₂
Explain giving excess oxygen to a patient with mild carbon monoxide poisoning helps them.

Question 20

The equilibrium constant for a reaction is 0.045. Which of the following is true for this reaction?

A) Equilibrium lies to the left.
B) Equilibrium lies to the right.
C) The reaction favors the product.