Q: Which of the following is the correct formula for calculating the molarity ($M$) of a solution?

$M = \dfrac{\text{moles of solute}}{\text{liters of solution}}$

Question 1

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of sodium sulfate and barium chloride?

Accepted Answer

$\mathrm{Ba^{2+}(aq) + SO_4^{2-}(aq) \rightarrow BaSO_4(s)}$

Question 2

A student mixes hydrochloric acid ($\mathrm{HCl}$) with sodium hydroxide ($\mathrm{NaOH}$). What is the balanced molecular equation for this reaction?

Accepted Answer

$\mathrm{HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)}$

Question 3

Which of the following acids is considered a strong acid?

Accepted Answer

$\mathrm{HNO_3}$

Question 4

A solution contains $0.10\ \mathrm{M}$ acetic acid ($\mathrm{CH_3COOH}$) and $0.10\ \mathrm{M}$ sodium acetate ($\mathrm{CH_3COONa}$). What is the main function of this mixture?

Accepted Answer

It acts as a buffer, resisting changes in pH when small amounts of acid or base are added.

Question 5

Which of the following is the correct formula for calculating the molarity ($M$) of a solution?

Accepted Answer

$M = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 6

Which of the following pairs of solutions will produce a precipitate when mixed?

Accepted Answer

$\mathrm{AgNO_3(aq)}$ and $\mathrm{NaCl(aq)}$

Question 7

Which of the following is the correct oxidation half-reaction for the reaction of zinc metal with copper(II) sulfate?

Accepted Answer

$\mathrm{Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-}$

Question 8

A student needs to prepare $250\ \mathrm{mL}$ of $0.50\ \mathrm{M}$ NaCl solution. How many grams of NaCl are required? ($\mathrm{NaCl}$ molar mass = $58.44\ \mathrm{g/mol}$)

Accepted Answer

$7.31\ \mathrm{g}$

Question 9

Which of the following best describes a weak electrolyte?

Accepted Answer

A substance that partially ionizes in water, resulting in a solution that conducts electricity poorly.

Question 10

Which of the following compounds is most likely to act as a Bronsted-Lowry base?

Accepted Answer

$\mathrm{NH_3}$

Question 11

Which of the following is the correct net ionic equation for the reaction between silver nitrate and potassium bromide?

Accepted Answer

$\mathrm{Ag^+(aq) + Br^-(aq) \rightarrow AgBr(s)}$

Question 12

Which of the following is the correct oxidation number for oxygen in hydrogen peroxide ($\mathrm{H_2O_2}$)?

Accepted Answer

$-1$

Question 13

Which of the following reactions is a redox reaction?

Accepted Answer

$\mathrm{2Na(s) + Cl_2(g) \rightarrow 2NaCl(s)}$

Question 14

Which of the following is the correct formula for calculating the dilution of a solution?

Accepted Answer

$M_1V_1 = M_2V_2$

Question 15

Which of the following is the correct reduction half-reaction for the reaction of copper(II) ions with zinc metal?

Accepted Answer

$\mathrm{Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)}$

Question 16

Which of the following is a correct example of a single replacement reaction?

Accepted Answer

$\mathrm{Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g)}$

Question 17

Which of the following ions is most likely to form a precipitate with sulfate ions ($\mathrm{SO_4^{2-}}$) in aqueous solution?

Accepted Answer

$\mathrm{Ba^{2+}}$

Question 18

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$	ext{Percent Yield} = \dfrac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100\%$

Question 19

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and potassium hydroxide?

Accepted Answer

$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$

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