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

A student mixes solutions of Na2SO4 and Ba(NO3)2. Which product will precipitate, and why?

Accepted Answer

BaSO4, because barium sulfate is insoluble in water.

Question 3

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

Accepted Answer

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

Question 4

Which compound is a weak electrolyte in water?

Accepted Answer

CH3COOH

Question 5

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of NaCl?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 6

Which of the following is true about oxidation numbers in a neutral compound?

Accepted Answer

The sum of the oxidation numbers equals zero.

Question 7

What is the oxidation number of sulfur in $$\mathrm{SO_2$}$$?

Accepted Answer

$$+4$$

Question 8

Which of the following is a correct molecular equation for the reaction between Pb(NO3)2(aq) and 2 KI(aq)?

Accepted Answer

$$\mathrm{Pb(NO_3$)_2}(aq) + 2\mathrm{KI}(aq) \rightarrow \mathrm{$$PbI_2$$}(s) + 2\mathrm{$$KNO_3$$}(aq)$$

Question 9

A student needs to prepare 250 mL of 0.10 M NaOH from a 1.0 M stock solution. What volume of stock solution should be used?

Accepted Answer

$$25\ \mathrm{mL}$$

Question 10

Which of the following best describes a spectator ion?

Accepted Answer

An ion that is unchanged on both sides of a chemical equation.

Question 11

Which of the following reactions is a redox reaction?

Accepted Answer

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

Question 12

A solution contains 0.0050 M MgCl2. What is the concentration of Cl- ions?

Accepted Answer

$$0.0100\ \mathrm{M}$$

Question 13

Which of the following is a correct complete ionic equation for the reaction between Na2SO4(aq) and BaCl2(aq)?

Accepted Answer

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

Question 14

Which of the following is a property of acids according to the Arrhenius definition?

Accepted Answer

They increase the concentration of $$\mathrm{H^+}$$ ions in water.

Question 15

A 50.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$100.0\ \mathrm{mL}$$

Question 16

Which of the following is a correct statement about the activity series of metals?

Accepted Answer

Metals above hydrogen in the series are more easily oxidized.

Question 17

Which of the following is a disproportionation reaction?

Accepted Answer

$$2\mathrm{H_2O_2}(aq) \rightarrow 2\mathrm{H_2O}(l) + \mathrm{O_2$}(g)$$

Question 18

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

Accepted Answer

$$\mathrm{M} = \dfrac{	ext{moles of solute}}{	ext{volume of solution (L)}}$$

Reactions in Aqueous Solution: General Chemistry Study Notes (Chapters 3 & 4)

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