Question 1

Which of the following best describes a balanced chemical equation?

Accepted Answer

It has the same number of atoms of each element on both sides of the equation.

Question 2

Given the reaction: $$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g)}$$, what is the mole ratio of $$\mathrm{O_2$} to$$ $$\mathrm{H_2O}$$?

Accepted Answer

$$2:2 or $$simplified $$1:1$$

Question 3

When aqueous solutions of $$\mathrm{$$CaCl_2$$}$$ and $$\mathrm{$$AgNO_3$$}$$ are mixed, which of the following is the correct balanced chemical equation for the reaction?

Accepted Answer

$$\mathrm{$$CaCl_2$$(aq) + 2AgNO_3(aq) \rightarrow Ca(NO_3$)_2(aq) + 2AgCl(s)}$$

Question 4

How many grams of magnesium nitride ($$\mathrm{Mg_3N_2}) $$are produced by the reaction of 8.32 g Mg with excess $$\mathrm{N_2$}$$? (Molar mass of Mg = 24.3 g/mol, $$\mathrm{Mg_3N_2} = 100.9 g/$$mol)

Accepted Answer

$$4.6 g$$

Question 5

Suppose you have a mixture of 10 mol $$\mathrm{H_2$}$$ and 7 mol $$\mathrm{O_2$}$$, which react together to form $$\mathrm{H_2O}. $$Which reactant is the limiting reagent?

Accepted Answer

$$\mathrm{H_2$}$$

Question 6

If 1.00 kg each of $$\mathrm{$$PCl_3$$} (137.33 g/$$mol), $$\mathrm{Cl_2$} (70.90 g/$$mol), and $$\mathrm{P_4O_{10}} (283.92 g/$$mol) are allowed to react, how many kilograms of $$\mathrm{$$POCl_3$$} (153.33 g/$$mol) will be formed? (Reaction: $$6\mathrm{$$PCl_3$$} + 6\mathrm{Cl_2$} + \mathrm{P_4O_{10}} \rightarrow 10\mathrm{$$POCl_3$$})$$

Accepted Answer

$$3.06 kg$$

Question 7

A student mixes $$\mathrm{Na_2SO_4(aq)}$$ and $$\mathrm{Pb(NO_3$)_2(aq)}. $$Which of the following is the net ionic equation for the formation of the precipitate?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$PbSO_4$$(s)}$$

Question 8

Which of the following ionic compounds is insoluble in water?

Accepted Answer

Lead sulfate

Question 9

Which statement about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes dissociate completely into ions in solution.

Question 10

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl(aq)}$$

Question 11

Which of the following is the correct dissociation equation for $$\mathrm{$$MgCl_2$$} in $$water?

Accepted Answer

$$\mathrm{$$MgCl_2$$(aq) \rightarrow Mg$$^{2+}$$(aq) + 2Cl^-(aq)}$$

Question 12

Which of the following acids is classified as a strong acid?

Accepted Answer

$$\mathrm{HCl}$$

Question 13

In the reaction $$\mathrm{Cd(s) + 2NiO_2(s) + 2H_2O(l) \rightarrow Cd(OH)_2(s) + 2Ni(OH)_2(s)}$$, which substance is oxidized?

Accepted Answer

$$\mathrm{Cd}$$

Question 14

Which of the following is the oxidizing agent in the reaction $$\mathrm{Cd(s) + 2NiO_2(s) + 2H_2O(l) \rightarrow Cd(OH)_2(s) + 2Ni(OH)_2(s)}$$?

Accepted Answer

$$\mathrm{$$NiO_2$$}$$

Question 15

What is the percent yield if 3.00 g of titanium metal reacts with 6.00 g of chlorine gas to form 7.7 g of titanium (IV) chloride? (Molar masses: Ti = 47.87 g/mol, Cl$$_2 = 70.90 g/$$mol, TiCl$$_4 = 189.71 g/$$mol)

Accepted Answer

$$86\%$$

Question 16

Which of the following is the correct net ionic equation for the reaction of silver nitrite and sodium iodide?

Accepted Answer

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

Question 17

Which of the following statements about precipitation reactions is correct?

Accepted Answer

A precipitate is an insoluble solid formed by a reaction in solution.

Question 18

Which of the following is a gas-forming reaction?

Accepted Answer

$$\mathrm{CO_3$^{2-}(aq) + 2H^+(aq) \rightarrow CO_2$(g) + H_2O(l)}$$

Chapter 4: Chemical Reactions, Stoichiometry, and Electrolytes

Study Guide - Practice Questions

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