Question 1

Which of the following is the correct chemical formula for barium bromide, given that barium forms a $$2^+$$ cation and bromide is a $$1^-$$ anion?

Accepted Answer

$$\mathrm{$$BaBr_2$$}$$

Question 2

A student is asked to calculate the mass of sodium sulfate ($$\mathrm{Na_2SO_4}) $$needed to prepare $$500\ \mathrm{mL} of a$$ $$0.2\ \mathrm{M}$$ solution. What is the correct mass to use? ($$\mathrm{Na} = 23.0$$, $$\mathrm{S} = 32.1$$, $$\mathrm{O} = 16.0)$$

Accepted Answer

$$14.2\ \mathrm{g}$$

Question 3

Which of the following best describes a structural isomer?

Accepted Answer

Compounds with the same molecular formula but different connectivity of their atoms.

Question 4

Which of the following equations correctly represents the relationship between molarity ($$M$$), moles of solute ($$n$$), and volume of solution ($$V in $$liters)?

Accepted Answer

$$M = \frac{n}{V}$$

Question 5

A solution is made by dissolving $$10.0\ \mathrm{g} of $$glucose ($$\mathrm{C_6H_{12}O_6$}) in $$enough water to make $$250\ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{C} = 12.0$$, $$\mathrm{H} = 1.0$$, $$\mathrm{O} = 16.0)$$

Accepted Answer

$$0.222\ \mathrm{M}$$

Question 6

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) $$conducts electricity when dissolved in water but not as a solid?

Accepted Answer

Ions are free to move in solution, allowing electrical current to flow.

Question 7

Balance the following equation and determine the coefficient for $$\mathrm{O_2$}$$: $$\mathrm{C_2H_6} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

3.5 (but must be doubled to 7 for whole numbers)

Question 8

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of silver nitrate ($$\mathrm{$$AgNO_3$$}) $$and sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

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

Question 9

A chemist needs to prepare $$250\ \mathrm{mL} of$$ $$0.10\ \mathrm{M}$$ $$\mathrm{H_2SO_4}$$ from a $$1.0\ \mathrm{M}$$ stock solution. What volume of the stock solution is required?

Accepted Answer

$$25\ \mathrm{mL}$$

Question 10

Which of the following statements about strong acids and weak acids is correct?

Accepted Answer

Strong acids completely ionize in water, while weak acids only partially ionize.

Question 11

If $$2.00\ \mathrm{g} of $$magnesium reacts with excess hydrochloric acid, how many liters of hydrogen gas ($$\mathrm{H_2$}) $$are produced at STP? ($$\mathrm{Mg} = 24.3$$, $$1\ \mathrm{mol}$$ gas at STP $$= 22.4\ \mathrm{L})$$

Accepted Answer

$$1.84\ \mathrm{L}$$

Question 12

Which of the following is the correct empirical formula for a compound with $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 13

A reaction has a theoretical yield of $$5.00\ \mathrm{g}$$ and an actual yield of $$4.20\ \mathrm{g}. $$What is the percent yield?

Accepted Answer

$$84\%$$

Question 14

Which of the following best describes a limiting reactant in a chemical reaction?

Accepted Answer

The reactant that is completely consumed first, limiting the amount of product formed.

Question 15

How many molecules are present in $$18.0\ \mathrm{g} of $$water ($$\mathrm{H_2O}$$)? ($$N_A = 6.022 	imes 10$$^{23}$$, $$\mathrm{H_2O}$$ molar mass = 18.0$$\ \mathrm{g/mol}$$)

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 16

Which of the following is the correct oxidation half-reaction for zinc?

Accepted Answer

$$\mathrm{Zn \rightarrow Zn$$^{2+}$$ + 2e^-}$$

Question 17

A $$0.50\ \mathrm{M}$$ solution of $$\mathrm{NaCl} is $$diluted to $$1.00\ \mathrm{L}$$ with water. If the initial volume was $$250\ \mathrm{mL}$$, what is the final concentration?

Accepted Answer

$$0.125\ \mathrm{M}$$

Question 18

Which of the following best explains why gases are generally less soluble in water at higher temperatures?

Accepted Answer

Increased temperature gives gas molecules more kinetic energy to escape from the solution.

Question 19

Which of the following is the correct ionic equation for the reaction of hydrochloric acid ($$\mathrm{HCl}) $$with sodium hydroxide ($$\mathrm{NaOH}$$)?

Accepted Answer

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

General Chemistry I: Essential Concepts, Skills, and Equations

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