Question 1

Which of the following compounds will form a precipitate when mixed with a solution of Na2CO3(aq), according to the solubility rules?

Accepted Answer

CaCl2(aq)

Question 2

Which of the following is the correct net ionic equation for the reaction between Ni(NO3)2(aq) and Na2CO3(aq)?

Accepted Answer

$\mathrm{Ni^{2+}(aq) + CO_3^{2-}(aq) \rightarrow NiCO_3(s)}$

Question 3

A solution contains 0.678 g of NaCl dissolved in enough water to make 25.0 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$\mathrm{0.464\ M}$

Question 4

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that dissolves in water and completely dissociates into ions.

Question 5

Which of the following is a correct balanced molecular equation for the neutralization of Mg(OH)2(aq) with HNO3(aq)?

Accepted Answer

$\mathrm{Mg(OH)_2(aq) + 2HNO_3(aq) \rightarrow Mg(NO_3)_2(aq) + 2H_2O(l)}$

Question 6

What is the oxidation number of chromium in $\mathrm{K_2Cr_2O_7}$?

Accepted Answer

$\mathrm{+6}$

Question 7

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 8

A 1.5 M solution of $\mathrm{H_2SO_4}$ is to be diluted to make 100.0 mL of a 0.18 M solution. What volume of the concentrated solution is required?

Accepted Answer

$\mathrm{12\ mL}$

Question 9

Which of the following pairs will NOT result in a precipitation reaction when mixed?

Accepted Answer

KNO3(aq) and NaCl(aq)

Question 10

In the reaction $\mathrm{2Al(s) + 3FeCl_2(aq) \rightarrow 2AlCl_3(aq) + 3Fe(s)}$, which species is the oxidizing agent?

Accepted Answer

FeCl2(aq)

Question 11

How many grams of $\mathrm{K_2Cr_2O_7}$ (molar mass = 294.2 g/mol) are needed to prepare 250.0 mL of a 0.100 M solution?

Accepted Answer

$\mathrm{7.36\ g}$

Question 12

A 6.0 M solution of NaOH is diluted by adding 880 mL of water to 120 mL of the original solution. What is the molarity of the diluted solution?

Accepted Answer

$\mathrm{0.75\ M}$

Question 13

Which of the following is a correct net ionic equation for the reaction between AgNO3(aq) and NaCl(aq)?

Accepted Answer

$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$

Question 14

Which of the following is a strong acid?

Accepted Answer

HNO3

Question 15

A sample of limestone (CaCO3) weighing 128.3 mg is dissolved and the Ca2+ is precipitated as CaCO3, forming 140.2 mg of precipitate. What is the percent by mass of Ca in the original sample? (Molar mass CaCO3 = 100.1 g/mol, Ca = 40.08 g/mol)

Accepted Answer

$\mathrm{43.6\%}$

Question 16

Which of the following best describes a spectator ion?

Accepted Answer

An ion that does not participate in the chemical reaction and remains unchanged in solution.

Question 17

How many milliliters of 0.163 M NaCl solution are required to dissolve 0.0958 g of NaCl? (Molar mass NaCl = 58.44 g/mol)

Accepted Answer

$\mathrm{10.1\ mL}$

Question 18

Which of the following is the correct oxidation half-reaction for the reaction $\mathrm{2Al(s) + 3FeCl_2(aq) \rightarrow 2AlCl_3(aq) + 3Fe(s)}$?

Accepted Answer

$\mathrm{Al(s) \rightarrow Al^{3+}(aq) + 3e^-}$

Question 19

A titration requires 34.61 mL of 0.2016 M HCl to neutralize 25.00 mL of Ba(OH)2 solution. What is the molarity of the Ba(OH)2 solution? (Reaction: $\mathrm{Ba(OH)_2 + 2HCl \rightarrow BaCl_2 + 2H_2O}$)

Accepted Answer

$\mathrm{0.139\ M}$

Aqueous Reactions, Solution Stoichiometry, and Redox Chemistry

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