Question 1

Which of the following best describes a precipitation reaction as used in molecular gastronomy?

Accepted Answer

A reaction in which a solid forms when two solutions are mixed.

Question 2

What is the molarity of a solution prepared by dissolving 0.50 mol of NaCl in enough water to make 2.0 L of solution?

Accepted Answer

$$0.25\ \mathrm{M}$$

Question 3

If you dissolve 25 g of salt in 251 g of water, what is the total mass of the resulting solution?

Accepted Answer

$$276\ \mathrm{g}$$

Question 4

How many moles of solute are required to make 3.0 L of a 2.0 M solution?

Accepted Answer

$$6.0\ \mathrm{mol}$$

Question 5

A 0.500 M NaCl solution contains how many moles of NaCl in 250 mL of solution?

Accepted Answer

$$0.125\ \mathrm{mol}$$

Question 6

Which of the following statements about electrolytes is correct?

Accepted Answer

A strong electrolyte completely dissociates into ions in water.

Question 7

Which of the following compounds will form a solution that conducts electricity when dissolved in water?

Accepted Answer

$$1.0\ \mathrm{M}\ \mathrm{KBr}$$

Question 8

Which of the following ions, when present in a compound, indicates that the compound is soluble in water with no exceptions?

Accepted Answer

$$\mathrm{Na^+}$$

Question 9

When aqueous solutions of $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$ are mixed, what is the net ionic equation for the reaction?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 10

Which of the following is a spectator ion in the reaction between $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$} in $$aqueous solution?

Accepted Answer

$$\mathrm{Na^+}$$

Question 11

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

$$20.0\ \mathrm{mL}$$

Question 12

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between reactants.

Question 13

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

Accepted Answer

$$+4$$

Question 14

Which metal is most easily oxidized according to the activity series?

Accepted Answer

$$\mathrm{Na}$$

Question 15

In an acid–base reaction between HCl and NaOH, what is the net ionic equation?

Accepted Answer

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

Question 16

Which of the following statements is true regarding redox reactions?

Accepted Answer

In a redox reaction, any increase in the oxidation state of a reactant must be accompanied by a decrease in the oxidation state of another reactant.

Question 17

Which of the following best explains why NaCl dissolves in water?

Accepted Answer

The attraction between Na+ and Cl- ions and water molecules is stronger than the attraction between the ions themselves.

Question 18

Which of the following is a weak electrolyte?

Accepted Answer

Acetic acid ($$\mathrm{CH_3COOH})$$

Question 19

A solution is prepared by diluting 50.0 mL of 6.0 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$$1.0\ \mathrm{M}$$

Chapter 5: Introduction to Solutions and Aqueous Reactions – Study Notes

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