Question 1

For the reaction $$2\mathrm{SO}_2(g) + \mathrm{O}_2(g) \rightarrow 2\mathrm{SO}_3(g)$$, what is the correct reaction quotient $$Q$$ expression in terms of partial pressures?

Accepted Answer

$$Q = \dfrac{P$$_{\mathrm{SO}$$_3}^2}{P$$_{\mathrm{SO}$$_2}^2 P$$_{\mathrm{O}$$_2}}$$

Question 2

A reaction vessel at 830 K contains $$0.10$$ atm $$\mathrm{SO}_2$$, $$0.40$$ atm $$\mathrm{SO}_3$$, and $$0.50$$ atm $$\mathrm{O}_2. $$Given $$K_p = 7.7 at 830 K $$for $$2\mathrm{SO}_2(g) + \mathrm{O}_2(g) \rightleftharpoons 2\mathrm{SO}_3(g)$$, in which direction will the reaction proceed to reach equilibrium?

Accepted Answer

To the right, since $$Q \u003c K_p$$

Question 3

Which of the following is the correct acid dissociation reaction for glyoxylic acid, $$\mathrm{HCOCO}_2\mathrm{H}$$?

Accepted Answer

$$\mathrm{HCOCO}_2\mathrm{H} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{HCOCO}_2^- + \mathrm{H}_3\mathrm{O}^+$$

Question 4

What is the pH of a $$0.25 M $$solution of glyoxylic acid, $$\mathrm{HCOCO}_2\mathrm{H}$$, if $$K_a = 3.5 	imes 10$$^{-4}$$?

Accepted Answer

$$1.42$$

Question 5

Which of the following structures CANNOT possibly be a reasonable Lewis structure for $$\mathrm{C}_2\mathrm{H}_6\mathrm{O}$$?

Accepted Answer

Structure (c)

Question 6

How are structures (a) and (b) in the previous question related to each other?

Accepted Answer

They are different compounds.

Question 7

Which of the following is a good 3D representation of the adjacent organic compound (lactone)?

Accepted Answer

Structure (c)

Question 8

Which of the following is a reasonable Lewis structure for $$\mathrm{BrCl}_3$$?

Accepted Answer

Structure (b)

Question 9

Which one of the structures for $$\mathrm{BrCl}_3$$ has Br with a $$+3$$ formal charge?

Accepted Answer

Structure (e)

Question 10

Given the acid dissociation constants $$K_a$$ for the following acids: $$K_a = 1.4 	imes 10$$^{-3}$$ for $$\mathrm{HClO}_2$$, K_a = 1.4$$ 	imes $$10^{-4}$$ for $$\mathrm{HClO}$$, and $$K_a = 1.3 	imes 10$$^{-5}$$ for $$\mathrm{HClO}_3$$, which of the following will be the weakest base?

Accepted Answer

Conjugate base of $$\mathrm{HClO}_3$$

Question 11

A solution is prepared by dissolving $$5.00 g of a $$weak base B ($$K_b = 1.6 	imes 10$$^{-6}$$) in 75.0$ mL of water. The pH of the solution is 10.73$. What is the molecular weight of B?

Accepted Answer

$$78.3 g/$$mol

Question 12

What is the balanced net ionic equation for the reaction: $$\mathrm{Cr($$ClO_4$$)_3}(aq) + \mathrm{KOH}(aq) \rightarrow \mathrm{K[Cr(OH)_6]}(aq) + \mathrm{$$KClO_4$$}(aq)$$?

Accepted Answer

$$\mathrm{Cr$$^{3+}$$}(aq) + 6\mathrm{OH}^-(aq) \rightarrow \mathrm{[Cr(OH)_6]^{3-}}(aq)$$

Question 13

If $$25.0 mL of$$ $$0.036 M$$ $$\mathrm{Cr($$ClO_4$$)_3} is $$mixed with $$75.0 mL of$$ $$0.045 M$$ $$\mathrm{KOH}$$, how many moles of $$\mathrm{K[Cr(OH)_6]}$$ will be made assuming the reaction goes to completion?

Accepted Answer

$$7.2 	imes 10$$^{-4}$$ mol

Question 14

What is the $$[OH^-] to $$the correct number of significant figures in a pH $$12.479$$ aqueous solution?

Accepted Answer

$$3.3189 	imes 10$$^{-2}$$ M

Question 15

If $$5.0 mL of a$$ $$0.050 M $$aqueous solution of HI is diluted to $$125.0 mL$$, what is the pH of the resulting solution?

Accepted Answer

$$2.70$$

Question 16

Which of the following is the correct formula for wine lactone, given the structure shown?

Accepted Answer

$$\mathrm{C}_8\mathrm{H}_{14}\mathrm{O}_2$$

Question 17

Which of the following would you need to prepare $$500 mL of a pH$$ $$10.75$$ aqueous solution?

Accepted Answer

$$0.036 g HI$$

Question 18

Consider the following acid-base reaction: $$2$$ acid-base pairs are involved. Which are they? (Answer in the format: acid/base, acid/base)

Accepted Answer

(1/2) and (3/4)

Question 19

Given the equilibrium constant for the acid-base reaction is $$2 	imes 10$$^{-4}$$ at 25$$^\circ$$C, which compound is the strongest acid in the reaction?

Accepted Answer

Compound 1

General Chemistry: Equilibrium, Acid-Base, Lewis Structures, and Solution Calculations – Study Guide

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