Question 1

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride, $$\mathrm{NaCl}$$

Question 2

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

Accepted Answer

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

Question 3

A student needs to prepare 250.0 mL of a 0.100 M $$\mathrm{Na_2SO_4}$$ solution. How many grams of $$\mathrm{Na_2SO_4}$$ are required? (Molar mass $$\mathrm{Na_2SO_4} = 142.04\ \mathrm{g/mol})$$

Accepted Answer

$$3.55\ \mathrm{g}$$

Question 4

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

Accepted Answer

$$\mathrm{CH_2O}$$

Question 5

Which of the following is a correct balanced molecular equation for the neutralization of hydrochloric acid with potassium hydroxide?

Accepted Answer

$$\mathrm{HCl(aq) + KOH(aq) \rightarrow KCl(aq) + H_2O(l)}$$

Question 6

Which of the following is NOT a diatomic element in its natural state?

Accepted Answer

Sulfur

Question 7

A solution is prepared by dissolving 5.00 g of $$\mathrm{KBr} ($$molar mass = $$119.0\ \mathrm{g/mol}) in $$enough water to make 250.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.168\ \mathrm{M}$$

Question 8

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 9

Which of the following is the correct name for $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

Iron(III) sulfate

Question 10

A reaction has a theoretical yield of 12.0 g, but only 9.0 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 11

Which of the following best describes the dissolution of acetic acid ($$\mathrm{CH_3COOH}) in $$water?

Accepted Answer

Partial ionization, producing $$\mathrm{CH_3COO^-}$$ and $$\mathrm{H^+}$$

Question 12

Which of the following is the correct formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 13

How many total ions are present in 0.200 L of 0.150 M $$\mathrm{$$CaCl_2$$}$$ solution?

Accepted Answer

$$0.0900\ \mathrm{mol}$$

Question 14

Which of the following is a correct balanced equation for the dissociation of potassium sulfate in water?

Accepted Answer

$$\mathrm{K_2SO_4(s) \rightarrow 2K^+(aq) + SO_4$^{2-}(aq)}$$

Question 15

Which of the following acids is NOT a strong acid?

Accepted Answer

Phosphoric acid, $$\mathrm{H_3PO_4}$$

Question 16

A solution is made by diluting 50.0 mL of 6.00 M $$\mathrm{HCl} to a $$final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$$1.00\ \mathrm{M}$$

Question 17

Which of the following best describes the process of preparing 500.0 mL of 0.200 M $$\mathrm{NaCl}$$ from a 1.00 M stock solution?

Accepted Answer

Mix 100.0 mL of 1.00 M $$\mathrm{NaCl}$$ with 400.0 mL water

Question 18

Which of the following is the correct net ionic equation for the neutralization of nitric acid with sodium hydroxide?

Accepted Answer

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

Question 19

Which of the following is the correct name for $$\mathrm{P_4O_{10}}$$?

Accepted Answer

Tetraphosphorus decoxide

CHEM105 Exam 3 Study Guide: Stoichiometry, Solutions, and Aqueous Reactions

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