Question

1. what does it mean if \\(k_{\text{eq}} < 1\\), at equilibrium?

a. the concentration of reactants is greater than the concentration of products.
b. the concentration of products is greater than the concentration of reactants.
c. the rate of the forward reaction is greater than the rate of the reverse reaction.
d. the rate of the reverse reaction is greater than the rate of the forward reaction.
e. the concentration of products and reactants are about the same.

1. which change does not shift equilibrium toward reactant formation?

a. increasing product concentration
b. decreasing reactant concentration
c. decreasing product concentration
d. a and b
e. a, b, and c

1. a concentrated weak acid is best described as which of the following?

a. a solution with a low ph
b. a solution where the concentration of undissociated acid particles is low compared to the concentration of hydronium ions
c. a solution where the concentration of hydronium ions is large compared to the concentration of undissociated acid particles
d. a solution with a high ph
e. a solution where the concentration of undissociated acid particles is high and the relative quantity of hydronium ions is small

1. a vessel contains \\(\text{nh}_3\\), \\(\text{n}_2\\), and \\(\text{h}_2\\) at equilibrium at \\(1000^\circ\text{c}\\). analysis of the contents shows that the concentration of \\(\text{nh}_3\\) is \\(0.102\text{ mol/l}\\), \\(\text{n}_2\\) is \\(1.03\text{ mol/l}\\), and \\(\text{h}_2\\) is \\(1.62\text{ mol/l}\\). calculate \\(k_{\text{eq}}\\)sic for the reaction:

\\2\text{nh}_3(\text{g}) \leftrightarrow \text{n}_2(\text{g}) + 3\text{h}_2(\text{g})\\
a. \\(2.37 \times 10^{-3}\\)
b. \\(3.89 \times 10^4\\)
c. \\(3.89 \times 10^{-4}\\)
d. \\(4.21 \times 10^2\\)
e. \\(9.02 \times 10^{-9}\\)

Explanation:

Analyze Question 17

Using the Chemical Equilibrium knowledge point

$$ K_{\text{eq}} = \frac{[\text{Products}]}{[\text{Reactants}]} < 1 \implies [\text{Reactants}] > [\text{Products}] $$

Analyze Question 18

Using the Le Chateliers Principle knowledge point

$$
LATEXBLOCK0
$$

Analyze Question 19

Identify the characteristics of a concentrated weak acid:

• "Concentrated" means a high ratio of total solute particles to solvent, so the concentration of undissociated acid molecules is high.
• "Weak" means only a small fraction of the acid molecules dissociate into hydronium ions, so the relative quantity of hydronium ions is small.
• Therefore, it is best described as a solution where the concentration of undissociated acid particles is high and the relative quantity of hydronium ions is small.

Analyze Question 20

Using the Chemical Equilibrium knowledge point

$$
LATEXBLOCK1
$$

Answer:

Question 17

• a. The concentration of reactants is greater than the concentration of products. (Correct answer)
• b. The concentration of products is greater than the concentration of reactants.
• c. The rate of the forward reaction is greater than the rate of the reverse reaction.
• d. The rate of the reverse reaction is greater than the rate of the forward reaction.
• e. The concentration of products and reactants are about the same.

Question 18

• a. increasing product concentration
• b. decreasing reactant concentration
• c. decreasing product concentration (Correct answer)
• d. a and b
• e. a, b, and c

Question 19

• a. a solution with a low pH
• b. a solution where the concentration of undissociated acid particles is low compared to the concentration of hydronium ions
• c. a solution where the concentration of hydronium ions is large compared to the concentration of undissociated acid particles
• d. a solution with a high pH
• e. a solution where the concentration of undissociated acid particles is high and the relative quantity of hydronium ions is small (Correct answer)

Question 20

• a. \(2.37 \times 10^{-3}\)
• b. \(3.89 \times 10^4\)
• c. \(3.89 \times 10^{-4}\)
• d. \(4.21 \times 10^2\) (Correct answer)
• e. \(9.02 \times 10^{-9}\)