Question 1

Which of the following best describes what happens when sodium chloride (NaCl) dissolves in water, as depicted in the first image?

Accepted Answer

Na+ and Cl- ions are surrounded by water molecules and separated from each other.

Question 2

A student prepares 2.0 L of a 0.50 M NaCl solution. How many moles of NaCl are present in the solution?

Accepted Answer

$$1.0$$ moles

Question 3

Which of the following statements about concentrated and dilute solutions is correct, based on the fourth image?

Accepted Answer

A dilute solution contains a relatively small amount of solute compared to solvent.

Question 4

Which of the following compounds is always soluble in water, according to the solubility rules in the fifth image?

Accepted Answer

NaNO$$_3$$

Question 5

A solution is prepared by dissolving 10.0 g of KBr in enough water to make 500 mL of solution. What is the molarity of the solution? (Molar mass of KBr = 119 g/mol)

Accepted Answer

$$0.17 M$$

Question 6

Which of the following best explains why ionic compounds conduct electricity when dissolved in water?

Accepted Answer

The ions are free to move and carry charge in solution.

Question 7

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 8

A precipitation reaction occurs when solutions of Pb(NO$$_3$$)$$_2$$ and KI are mixed. What is the balanced molecular equation for this reaction?

Accepted Answer

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

Question 9

Which of the following ions is a spectator ion in the reaction between Na$$_2SO$_4 (aq) $$and BaCl$$_2 (aq$$)?

Accepted Answer

Na$$^+$$

Question 10

A student wants to prepare 250 mL of a 1.0 M HCl solution from a 6.0 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$42 mL$$

Question 11

Which of the following best describes a net ionic equation?

Accepted Answer

An equation showing only the species that actually change during the reaction.

Question 12

Which of the following acids is a strong acid?

Accepted Answer

HCl

Question 13

In an acid–base titration, what is the equivalence point?

Accepted Answer

The point at which the amount of acid equals the amount of base in stoichiometric ratio.

Question 14

Which of the following reactions is a redox reaction?

Accepted Answer

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

Question 15

What is the oxidation state of sulfur in SO$$_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 16

Which of the following metals is most easily oxidized, according to the activity series?

Accepted Answer

Na

Question 17

Which of the following statements about solubility rules is correct?

Accepted Answer

All compounds containing NO$$_3^-$$ are soluble.

Question 18

A 10.0 mL sample of 0.20 M HBr is titrated with 0.10 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$20.0 mL$$

Question 19

Which of the following best describes the role of a reducing agent in a redox reaction?

Accepted Answer

It loses electrons and is oxidized.

Solutions and Aqueous Reactions: Concentration, Solubility, and Reaction Types

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