Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture in which the solute is uniformly distributed within the solvent.

Question 2

What is the molarity of a solution prepared by dissolving 5.00 grams of NaCl (molar mass = 58.44 g/mol) in enough water to make 250.00 mL of solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 3

Which of the following statements about electrolytes is correct?

Accepted Answer

Ionic compounds that completely dissociate in water are strong electrolytes.

Question 4

A student wants to prepare 100.00 mL of a 0.75 M NaBr solution. How many grams of NaBr (molar mass = 102.89 g/mol) are required?

Accepted Answer

$$5.14\ \mathrm{g}$$

Question 5

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

Accepted Answer

The solute-solvent interactions between Na$$^+$$, Cl$$^-$$ ions and polar water molecules are stronger than the ionic bonds in NaCl.

Question 6

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of NaCl and AgNO$$_3$$?

Accepted Answer

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

Question 7

A solution is prepared by diluting 25.00 mL of 2.50 M NaCl to a final volume of 500.00 mL. What is the final molarity?

Accepted Answer

$$0.125\ \mathrm{M}$$

Question 8

Which of the following is a strong acid?

Accepted Answer

HCl

Question 9

Which of the following reactions is a precipitation reaction?

Accepted Answer

$$\mathrm{KI}(aq) + \mathrm{Pb(NO}_3)_2(aq) \rightarrow \mathrm{PbI}_2(s) + 2\mathrm{KNO}_3(aq)$$

Question 10

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH}_4$$)?

Accepted Answer

$$\mathrm{CH}_4(g) + 2\mathrm{O}_2(g) \rightarrow \mathrm{CO}_2(g) + 2\mathrm{H}_2O(g)$$

Question 11

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 12

Which of the following compounds is a nonelectrolyte in aqueous solution?

Accepted Answer

C$$_6H$_{12}O$_6 ($$glucose)

Question 13

What is the oxidation state of sulfur in SO$$_2$$?

Accepted Answer

$$+4$$

Question 14

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid reacts with a base to produce a salt and water.

Question 15

A sample of 10.00 mL of 2.50 M HCl reacts completely with 13.75 mL of Ca(OH)$$_2. $$What is the molarity of the Ca(OH)$$_2$$ solution?

Accepted Answer

$$0.909\ \mathrm{M}$$

Question 16

Which of the following is a decomposition reaction?

Accepted Answer

$$2\mathrm{H}_2O(l) \rightarrow 2\mathrm{H}_2(g) + \mathrm{O}_2(g)$$

Question 17

Which of the following best describes a spectator ion?

Accepted Answer

An ion that is present in the same form on both sides of a chemical equation and does not participate in the reaction.

Question 18

Which of the following metals will NOT react with aqueous KBr, based on the activity series?

Accepted Answer

Cu

Introduction to Solutions and Chemical Reactions: Solution Concentration, Types, and Reaction Stoichiometry

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