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

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

General Chemistry: Practice Checklist and Study Guide for Chemical Reactions, Stoichiometry, and Acid-Base Chemistry

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