$$\displaystyle \frac{9.0}{12.0} \times 100 = 75\%$$

$$\mathrm{Molarity\ (M) = \dfrac{\text{moles\ of\ solute}}{\text{liters\ of\ solution}}}$$

Question 1

Which of the following best describes a weak electrolyte?

Accepted Answer

A substance that partially dissociates into ions in solution.

Question 2

A student mixes 50.0 mL of 0.200 M NaCl with 50.0 mL of 0.200 M AgNO$$_3. $$What is the balanced net ionic equation for the reaction that occurs?

Accepted Answer

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

Question 3

Which of the following statements is TRUE regarding the enthalpy change ($$\Delta H) $$for a chemical reaction?

Accepted Answer

$$\Delta H is $$negative for exothermic reactions and positive for endothermic reactions.

Question 4

A reaction has a theoretical yield of 12.0 g of product. If the actual yield is 9.0 g, what is the percent yield?

Accepted Answer

$$\displaystyle \frac{9.0}{12.0} 	imes 100 = 75\%$$

Question 5

Which of the following is the correct balanced equation for the combustion of propane ($$\mathrm{C_3H_8}) in $$oxygen?

Accepted Answer

$$\mathrm{C_3H_8 (g) + 5 O_2$ (g) \rightarrow 3 CO_2$ (g) + 4 H_2O (g)}$$

Question 6

Which of the following compounds is a strong acid?

Accepted Answer

$$\mathrm{$$HNO_3$$}$$

Question 7

A 25.0 mL sample of 0.100 M HCl is titrated with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$12.5\ \mathrm{mL}$$

Question 8

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

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 9

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 10

A sample of gas occupies 2.50 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K?

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 11

Which of the following is the correct expression for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 12

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

Accepted Answer

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

Question 13

A chemical reaction has $$\Delta H = -250\ \mathrm{kJ}. $$Which of the following best describes this reaction?

Accepted Answer

The reaction is exothermic and releases heat to the surroundings.

Question 14

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

Accepted Answer

$$\mathrm{Molarity\ (M) = \dfrac{	ext{moles\ of\ solute}}{	ext{liters\ of\ solution}}}$$

Question 15

Which of the following is the correct balanced equation for the neutralization reaction between H$$_2SO$_4$$ and NaOH?

Accepted Answer

$$\mathrm{H_2SO_4 (aq) + 2 NaOH (aq) \rightarrow 2 H_2O (l) + Na_2SO_4 (aq)}$$

Question 16

A 100.0 mL solution of 0.500 M NaOH is diluted to a final volume of 250.0 mL. What is the final concentration?

Accepted Answer

$$0.200\ \mathrm{M}$$

Question 17

Which of the following is the correct relationship for Boyle's Law?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 18

Which of the following is the correct definition of the standard enthalpy of formation ($$\Delta H_f^\circ$$)?

Accepted Answer

The enthalpy change when one mole of a compound is formed from its elements in their standard states.

Question 19

A reaction mixture contains 0.50 mol of A and 0.30 mol of B. The balanced equation is $$A + 2B \rightarrow C. $$What is the limiting reactant?

Accepted Answer

B

Question 20

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

Accepted Answer

It gains electrons and is reduced.

General Chemistry Study Guide: Chapters 7–10 (Stoichiometry, Solutions, Thermochemistry, Gases)

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