Q: Given the reaction mechanism for CHCl\_3 + Cl\_2 \rightarrow CCl\_4 + HCl, where the slow step is CHCl\_3 + Cl \rightarrow CCl\_3 + HCl, what is the correct rate law for the overall reaction?

$$\text{rate} = k[$$CHCl_3$$][Cl_2$]$$

Q: A plot of $$\ln k vs$$ $$\frac{1}{T}$$ for a reaction is linear with a slope of $$-2.00 \times 10^4$ K. What is the activation energy E_a$ for the reaction?

$$E_a = (2.00 \times 10^4$) \times R$$

Q: Which of the following is the correct Henderson-Hasselbalch equation for calculating the pH of a buffer solution?

$$\text{pH} = \text{p}K_a + \log \left( \frac{[\text{A}^-]}{[\text{HA}]} \right)$$

Question 1

Which of the following substances exhibits hydrogen bonding as its strongest intermolecular force?

Accepted Answer

NH\_3

Question 2

A phase diagram shows a transition from point A (solid) to point C (gas) as temperature increases at constant pressure. What is this phase transition called?

Accepted Answer

Sublimation

Question 3

Which of the following 0.5 m aqueous solutions will have the lowest boiling point?

Accepted Answer

0.5 m Na\_2S

Question 4

For the elementary reaction 2A + B \rightarrow C, what is the correct rate law?

Accepted Answer

$$	ext{rate} = k[A]^2[B]$$

Question 5

Given the reaction mechanism for CHCl\_3 + Cl\_2 \rightarrow CCl\_4 + HCl, where the slow step is CHCl\_3 + Cl \rightarrow CCl\_3 + HCl, what is the correct rate law for the overall reaction?

Accepted Answer

$$	ext{rate} = k[$$CHCl_3$$][Cl_2$]$$

Question 6

Which of the following changes will shift the equilibrium of the endothermic reaction C(s) + H\_2O(g) \rightleftharpoons CO(g) + H\_2(g) to the right?

Accepted Answer

Increasing the temperature

Question 7

What is the conjugate base of H\_3O\^+?

Accepted Answer

H\_2O

Question 8

A student titrates 0.15 M CH\_3COOH with 0.1 M NaOH. At the equivalence point, what is the major species present in solution?

Accepted Answer

CH\_3COO\^-

Question 9

Which of the following is the correct equilibrium constant expression for the reaction: 2CH\_2Cl\_2(g) + Cl\_2(g) \rightleftharpoons 2CHCl\_3(g) + H\_2(g)?

Accepted Answer

$$K = \frac{[$$CHCl_3$$]^2[H_2$]}{[CH_2Cl_2]^2[Cl_2$]}$$

Question 10

Calculate the pH of a 0.1 M solution of HF (K\_a = $$6.8 	imes 10$$^{-4}$$).

Accepted Answer

pH = 2.6

Question 11

Which of the following best describes the effect of adding NaCl to a saturated AgCl solution?

Accepted Answer

The solubility of AgCl decreases due to common ion effect.

Question 12

Given the reaction 2CO(g) + O\_2(g) \rightarrow 2CO\_2(g), calculate $$\Delta S^\circ at 25$^\circC $$using the following data: $$\Delta S^\circ_{CO_2$} = -174.4 J/$$mol·K, $$\Delta S^\circ_{CO} = -197.9 J/$$mol·K, $$\Delta S^\circ_{O_2$} = 205.0 J/$$mol·K.

Accepted Answer

$$\Delta S^\circ = -174.4 - [2(-197.9) + 205.0]$$

Question 13

For the reaction Ag\^+(aq) + Cl\^-(aq) \rightarrow AgCl(s), what is the correct solubility product expression?

Accepted Answer

$$K_{sp} = [Ag^+][Cl^-]$$

Question 14

A plot of $$\ln k vs$$ $$\frac{1}{T}$$ for a reaction is linear with a slope of $$-2.00 	imes 10^4$ K. What is the activation energy E_a$ for the reaction?

Accepted Answer

$$E_a = (2.00 	imes 10^4$) 	imes R$$

Question 15

Which of the following is true about the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy.

Question 16

For the reaction C(s) + O\_2(g) \rightarrow CO\_2(g), which change will shift the equilibrium to the left?

Accepted Answer

Removing C(s)

Question 17

Which of the following is the correct Henderson-Hasselbalch equation for calculating the pH of a buffer solution?

Accepted Answer

$$	ext{pH} = 	ext{p}K_a + \log \left( \frac{[	ext{A}^-]}{[	ext{HA}]} ight)$$

Question 18

A solution of LiCl has a freezing point of $$-1.2^\circC. If$$ $$K_f$$ for water is $$1.86^\circC$$·kg/mol, what is the molality of the solution?

Accepted Answer

$$m = \frac{1.2}{1.86}$$

General Chemistry II Final Exam Review – Key Concepts and Problem Types

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