Question 1

Which of the following statements best describes an aqueous solution?

Accepted Answer

A homogeneous mixture in which water is the solvent.

Question 2

When sodium chloride ($$\mathrm{NaCl}) $$dissolves in water, what process occurs?

Accepted Answer

Dissociation into $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions surrounded by water molecules.

Question 3

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium hydroxide ($$\mathrm{NaOH})$$

Question 4

Which of the following is NOT a characteristic of a strong electrolyte?

Accepted Answer

It only partially dissociates in water.

Question 5

A solution of $$\mathrm{CH_3COOH} ($$acetic acid) in water is classified as:

Accepted Answer

A weak electrolyte.

Question 6

Which of the following combinations will produce a precipitate when mixed in aqueous solution?

Accepted Answer

$$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KCl}$$

Question 7

What is the net ionic equation for the reaction between $$\mathrm{Pb(NO_3$)_2} (aq) $$and $$\mathrm{KCl} (aq$$)?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2Cl^-(aq) \rightarrow $$PbCl_2$$(s)}$$

Question 8

Which of the following is a spectator ion in the reaction between $$\mathrm{Pb(NO_3$)_2} (aq) $$and $$\mathrm{KCl} (aq$$)?

Accepted Answer

$$\mathrm{K^+}$$

Question 9

Which of the following acids is classified as a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 10

What is the balanced molecular equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 11

A student mixes $$\mathrm{Na_2CO_3} (aq) $$with $$\mathrm{HCl} (aq). $$What gas is produced?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 12

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

Accepted Answer

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

Question 13

If you dilute 100 mL of a 2.0 M $$\mathrm{NaCl}$$ solution to a final volume of 500 mL, what is the new molarity?

Accepted Answer

$$\mathrm{0.40\ M}$$

Question 14

Which of the following is true about oxidation-reduction (redox) reactions?

Accepted Answer

Oxidation and reduction always occur together.

Question 15

What is the oxidation number of oxygen in $$\mathrm{H_2O_2} ($$hydrogen peroxide)?

Accepted Answer

$$-1$$

Question 16

Which element has an oxidation number of zero in its elemental form?

Accepted Answer

Chlorine in $$\mathrm{Cl_2$}$$ gas

Question 17

A metal higher than hydrogen in the activity series will:

Accepted Answer

React with acids to produce hydrogen gas.

Question 18

Which of the following is a correct application of the dilution equation $$\mathrm{M_1V_1 = M_2V_2}$$?

Accepted Answer

Determining the final concentration after adding solvent.

Question 19

During a titration, the equivalence point is reached when:

Accepted Answer

The moles of acid equal the moles of base.

Reactions in Aqueous Solution: Electrolytes, Dissolution, and Solution Chemistry

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