Q: Which of the following is the correct expression for molarity ($$M$$)?

$$M = \dfrac{\text{moles of solute}}{\text{liters of solution}}$$

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 reaction between aqueous solutions of silver nitrate and sodium chloride produces a precipitate. Which of the following is the correct net ionic equation for this reaction?

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 student mixes 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NaOH in a coffee-cup calorimeter. The temperature of the solution increases by 6.0 $$^\circC. $$Which of the following best explains the energy change?

Accepted Answer

The reaction is exothermic; heat is released to the surroundings.

Question 5

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

Accepted Answer

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

Question 6

A solution is prepared by diluting 25.0 mL of 6.00 M HNO$$_3 to a $$final volume of 150.0 mL. What is the final concentration?

Accepted Answer

$$1.00\ \mathrm{M}$$

Question 7

Which of the following compounds is a strong base?

Accepted Answer

$$\mathrm{KOH}$$

Question 8

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

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 9

Which of the following is the correct oxidation state of sulfur in $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$+6$$

Question 10

Which of the following statements about the ideal gas law is correct?

Accepted Answer

The ideal gas law can be written as $$PV = nRT.$$

Question 11

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 12

Which of the following is a combination reaction?

Accepted Answer

$$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)}$$

Question 13

Which of the following is the correct expression for molarity ($$M$$)?

Accepted Answer

$$M = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 14

Which of the following is the correct balanced equation for the neutralization of sulfuric acid with potassium hydroxide?

Accepted Answer

$$\mathrm{H_2SO_4(aq) + 2KOH(aq) \rightarrow K_2SO_4(aq) + 2H_2O(l)}$$

Question 15

Which of the following is the correct formula for calculating the energy change using specific heat capacity?

Accepted Answer

$$q = m c \Delta T$$

Question 16

A 0.500 g sample of magnesium reacts with excess hydrochloric acid to produce hydrogen gas. What is the limiting reactant?

Accepted Answer

Magnesium

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 net ionic equation for the reaction of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 19

A sample of gas has a density of $$1.25\ \mathrm{g/L} at$$ $$STP. $$What is its molar mass?

Accepted Answer

$$28.0\ \mathrm{g/mol}$$

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

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