Question 1

A student dissolves 97.7 g of LiBr in enough water to make 750.0 mL of solution. What is the molarity of the solution? (Molar mass of LiBr = 86.85 g/mol)

Accepted Answer

$$1.18\ \mathrm{M}$$

Question 2

Which of the following compounds is generally insoluble in water?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 3

What is the limiting reactant when 18.0 moles of $$\mathrm{Al_2S_3}$$ react with 6.0 moles of $$\mathrm{H_2O}$$ according to the equation: $$\mathrm{Al_2S_3} (s) + 6\mathrm{H_2O} (l) \rightarrow 2\mathrm{Al(OH)_3} (s) + 3\mathrm{H_2S} (g)$$?

Accepted Answer

$$\mathrm{H_2O}$$

Question 4

According to the solubility rules, which of the following will form a precipitate when mixed?

Accepted Answer

$$\mathrm{$$AgNO_3$$}$$ + $$\mathrm{NaCl}$$

Question 5

A balloon is filled with 4.00 L of gas at 9°C. To what temperature must it be heated to have a volume of 6.00 L, assuming constant pressure?

Accepted Answer

$$423\ \mathrm{K}$$

Question 6

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

What is the percent yield if 28.65 g of Fe is produced when 50.0 g of Fe$$_2O$_3$$ reacts with excess Al according to the reaction: $$\mathrm{Fe_2O_3} (s) + 2\mathrm{Al} (s) \rightarrow 2\mathrm{Fe} (s) + \mathrm{Al_2O_3} (s)$$? (Molar mass Fe$$_2O$_3 = 159.70 g/$$mol, Fe = 55.85 g/mol)

Accepted Answer

$$81.03\%$$

Question 8

Which statement is FALSE according to the kinetic molecular theory?

Accepted Answer

A single particle does not move in a straight line.

Question 9

What is the total pressure of a gas mixture if the partial pressures of its components are 1.5 atm, 0.8 atm, and 2.2 atm?

Accepted Answer

$$4.5\ \mathrm{atm}$$

Question 10

Which of the following ions is generally soluble in water with no exceptions?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 11

A sample of gas has a pressure of 1.20 atm, a volume of 2.50 L, and a temperature of 300 K. What is the number of moles of gas present? ($$R = 0.08206\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$0.122\ \mathrm{mol}$$

Question 12

Which of the following is a gas-evolution reaction?

Accepted Answer

$$\mathrm{Na_2CO_3} (aq) + 2\mathrm{HCl} (aq) \rightarrow 2\mathrm{NaCl} (aq) + \mathrm{H_2O} (l) + \mathrm{CO_2$} (g)$$

Question 13

What is the change in oxidation state for bromine in the following unbalanced reduction half-reaction? $$\mathrm{$$BrO_3$$^-} (aq) + H^+ (aq) + e^- \rightarrow \mathrm{Br^-} (aq) + H_2O (l)$$

Accepted Answer

$$+5 \rightarrow -1$$

Question 14

Which element is undergoing reduction in the following reaction? $$\mathrm{Ca} (s) + \mathrm{N_2$} (g) \rightarrow \mathrm{Ca_3N_2} (s)$$

Accepted Answer

N

Question 15

Which of the following is the least reactive alkali metal with water?

Accepted Answer

Li

Question 16

A solution is prepared by mixing 100.0 mL of 0.200 M NaCl and 200.0 mL of 0.100 M NaCl. What is the final concentration of NaCl in the mixture?

Accepted Answer

$$0.133\ \mathrm{M}$$

Question 17

Which of the following statements about strong acids is TRUE?

Accepted Answer

Strong acids completely dissociate into ions in water.

Question 18

What is the molar mass of $$\mathrm{$$MgSO_4$$}$$?

Accepted Answer

$$96.38\ \mathrm{g/mol}$$

Question 19

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of HCl and NaOH?

Accepted Answer

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

General Chemistry Study Guide: Chemical Reactions, Solutions, and Gases

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