Question 1

Which of the following statements best describes a strong electrolyte in aqueous solution?

Accepted Answer

It completely dissociates into ions when dissolved in water.

Question 2

Which compound is insoluble in water according to the solubility rules?

Accepted Answer

AgCl

Question 3

What is the molarity of a solution prepared by dissolving 17.1 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500 mL of solution?

Accepted Answer

$$0.585\ \mathrm{M}$$

Question 4

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{SO}_4$$^{2-}$$(aq) + \mathrm{Ba}^{2+}(aq) \rightarrow \mathrm{BaSO}_4(s)$$

Question 5

A chemist wants to prepare 250 mL of 0.200 M KNO$$_3$$ solution. How many grams of KNO$$_3 ($$molar mass = 101.1 g/mol) are required?

Accepted Answer

$$5.06\ \mathrm{g}$$

Question 6

Which of the following best describes the role of water molecules when NaCl dissolves in water?

Accepted Answer

Water molecules surround and insulate the ions, preventing them from recombining.

Question 7

Which of the following is a correct balanced molecular equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaOH}(aq) \rightarrow \mathrm{NaCl}(aq) + \mathrm{H}_2\mathrm{O}(l)$$

Question 8

Which of the following compounds will produce a gas when reacted with hydrochloric acid?

Accepted Answer

Na$$_2CO$_3$$

Question 9

What is the oxidation number of sulfur in SO$$_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 10

Which of the following is a correct net ionic equation for the neutralization of a strong acid with a strong base?

Accepted Answer

$$\mathrm{H}^+(aq) + \mathrm{OH}^-(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l)$$

Question 11

A 50.0 mL sample of 0.200 M H$$_2SO$_4 is $$neutralized by NaOH. What volume of 0.100 M NaOH is required? (Balanced equation: $$2\mathrm{NaOH} + \mathrm{H}_2\mathrm{SO}_4 \rightarrow 2\mathrm{H}_2\mathrm{O} + \mathrm{Na}_2\mathrm{SO}_4)$$

Accepted Answer

$$100\ \mathrm{mL}$$

Question 12

Which of the following is the correct oxidation number for nitrogen in NO$$_3^-$$?

Accepted Answer

$$+5$$

Question 13

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from the mixing of two solutions.

Question 14

Which of the following is a weak electrolyte?

Accepted Answer

HF

Question 15

What is the oxidation number of carbon in CO$$_2$$?

Accepted Answer

$$+4$$

Question 16

Which of the following is the correct net ionic equation for the reaction of Na$$_2CO$_3$$ with HCl?

Accepted Answer

$$\mathrm{CO}_3$$^{2-}$$(aq) + 2\mathrm{H}^+(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l) + \mathrm{CO}_2(g)$$

Question 17

Which of the following is the oxidizing agent in the reaction: $$2\mathrm{Na}(s) + \mathrm{Cl}_2(g) \rightarrow 2\mathrm{NaCl}(s)$$?

Accepted Answer

Cl$$_2$$

Question 18

A solution is prepared by diluting 50.0 mL of 6.00 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$$1.00\ \mathrm{M}$$

Chapter 5: Introduction to Solutions and Aqueous Reactions – Study Notes

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