Question 1

Which of the following best classifies the reaction: $$\mathrm{C_8H_{18}(g) + O_2$(g) \rightarrow CO_2$(g) + H_2O(g)}$$?

Accepted Answer

Combustion

Question 2

Given the reaction $$\mathrm{2Al(s) + 3Br_2(l) \rightarrow 2AlBr_3(s)}$$, which element is oxidized and which is reduced?

Accepted Answer

Al is oxidized, Br is reduced

Question 3

Calculate the number of moles in $$74.3\ \mathrm{g} of$$ $$\mathrm{Na_2SO_4}$$ ($$M = 142.04\ \mathrm{g/mol}).$$

Accepted Answer

$$0.523\ \mathrm{mol}$$

Question 4

A solution is made by dissolving $$89.5\ \mathrm{g} of$$ $$\mathrm{KCl} in$$ $$8.7\ \mathrm{L} of $$water. What is the molarity of the solution? ($$M_{KCl} = 74.55\ \mathrm{g/mol})$$

Accepted Answer

$$0.139\ \mathrm{M}$$

Question 5

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

Accepted Answer

$$\mathrm{AgBr}$$

Question 6

What is the net ionic equation for the reaction between $$\mathrm{NaI}$$ and $$\mathrm{$$AgNO_3$$} in $$aqueous solution?

Accepted Answer

$$\mathrm{Ag^+ (aq) + I^- (aq) \rightarrow AgI (s)}$$

Question 7

If $$92\ \mathrm{mL} of a$$ $$0.47\ \mathrm{M}$$ $$\mathrm{NaBr}$$ solution is diluted to $$730\ \mathrm{mL}$$, what is the final concentration?

Accepted Answer

$$0.059\ \mathrm{M}$$

Question 8

Which of the following is a strong electrolyte in aqueous solution?

Accepted Answer

$$\mathrm{NH_4Cl}$$

Question 9

A reaction releases $$802\ \mathrm{kJ}$$: $$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g) + 802\ kJ}. $$What is the sign of $$\Delta H$$ and is the reaction endothermic or exothermic?

Accepted Answer

$$\Delta H is $$negative; exothermic

Question 10

Which of the following is the correct balanced equation for the combustion of $$\mathrm{C_5H_8}$$?

Accepted Answer

$$\mathrm{C_5H_8(g) + 7O_2(g) \rightarrow 5CO_2(g) + 4H_2O(g)}$$

Question 11

How much energy is released when $$640.0\ \mathrm{g} of$$ $$\mathrm{C_3H_8}$$ combusts? ($$\Delta H = -2220\ \mathrm{kJ}$$ per mole, $$M_{C_3H_8} = 44.10\ \mathrm{g/mol})$$

Accepted Answer

$$-32,200\ \mathrm{kJ}$$

Question 12

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{HF}$$

Question 13

A student mixes $$90\ \mathrm{mL} of$$ $$0.4\ \mathrm{M}$$ $$\mathrm{$$CaCl_2$$}$$ with $$270\ \mathrm{mL} of$$ $$0.7\ \mathrm{M}$$ $$\mathrm{H_2SO_4}. $$What is the limiting reactant for the formation of $$\mathrm{$$CaSO_4$$}$$ precipitate?

Accepted Answer

$$\mathrm{$$CaCl_2$$}$$

Question 14

Which of the following is a non-electrolyte?

Accepted Answer

Glucose

Question 15

What is the percent yield if $$0.392\ \mathrm{g} of$$ $$\mathrm{$$AgNO_3$$}$$ and $$0.233\ \mathrm{g} of$$ $$\mathrm{NaCl}$$ produce $$0.0893\ \mathrm{g} of$$ $$\mathrm{AgCl}$$? ($$M_{AgCl} = 143.32\ \mathrm{g/mol})$$

Accepted Answer

$$57.6\%$$

Question 16

Which of the following ions would you expect to find in a solution of $$\mathrm{$$CaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$ and $$\mathrm{Cl^-}$$

Question 17

Which of the following salts will form a precipitate when mixed in aqueous solution?

Accepted Answer

$$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{K_2S}$$

Question 18

How many grams of $$\mathrm{AgCl}$$ will precipitate when $$28\ \mathrm{mL} of$$ $$0.1\ \mathrm{M}$$ $$\mathrm{NaBr} is $$mixed with $$42\ \mathrm{mL} of$$ $$0.1\ \mathrm{M}$$ $$\mathrm{$$AgNO_3$$}$$? ($$M_{AgCl} = 143.32\ \mathrm{g/mol})$$

Accepted Answer

$$0.143\ \mathrm{g}$$

Question 19

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{$$CaCl_2$$}$$ and $$\mathrm{Na_2SO_4}$$?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$CaSO_4$$ (s)}$$

Comprehensive GOB Chemistry Study Guide: Reaction Types, Stoichiometry, Solutions, and Electrolytes

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