Question 1

Which of the following best describes the role of a limiting reactant in a chemical reaction?

Accepted Answer

It is the reactant that is completely consumed first, thus limiting the amount of product that can be formed.

Question 2

A student dissolves 7.89 g of calcium acetate ($$\mathrm{Ca(C_2H_3O_2)_2}$$, molar mass = 158.17 g/mol) in enough water to make 1.00 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.0500\ \mathrm{mol/L}$$

Question 3

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgCl}$$

Question 4

What is the net ionic equation for the reaction between aqueous solutions of potassium carbonate and nickel(II) chloride?

Accepted Answer

$$\mathrm{CO_3$^{2-}(aq) + Ni$$^{2+}$$(aq) \rightarrow $$NiCO_3$$(s)}$$

Question 5

A combustion reaction of octane ($$\mathrm{C_8H_{18}}) in $$oxygen produces carbon dioxide and water. What is the balanced chemical equation for this reaction?

Accepted Answer

$$\mathrm{2C_8H_{18} + 25O_2 \rightarrow 16CO_2 + 18H_2O}$$

Question 6

If 8.20 g of titanium dioxide ($$\mathrm{$$TiO_2$$}$$, molar mass = 79.87 g/mol) reacts with 28.6 g of carbon ($$\mathrm{C}$$, molar mass = 12.01 g/mol) according to the equation $$\mathrm{$$TiO_2$$(s) + 2C(s) \rightarrow Ti(s) + 2CO(g)}$$, what is the limiting reactant?

Accepted Answer

Titanium dioxide ($$\mathrm{$$TiO_2$$})$$

Question 7

A solution is prepared by mixing 0.10 L of 0.12 mol/L NaCl with 0.23 L of 0.18 mol/L MgCl$$_2. $$What volume (in L) of 0.20 mol/L AgNO$$_3$$ must be added to precipitate all chloride ions as AgCl?

Accepted Answer

$$0.29\ \mathrm{L}$$

Question 8

Which of the following statements about electrolytes is correct?

Accepted Answer

A strong electrolyte completely dissociates into ions in water and conducts electricity well.

Question 9

What is the percent yield if 3.50 g of product is obtained in a reaction with a theoretical yield of 4.20 g?

Accepted Answer

$$83.3\%$$

Question 10

Which of the following is the correct net ionic equation for the precipitation reaction between aqueous solutions of lead(II) nitrate and potassium iodide?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Question 11

A plant consumes 37.8 g of CO$$_2 in $$one week. Using the photosynthesis equation $$\mathrm{6CO_2(g) + 6H_2O(l) \rightarrow C_6H_{12}O_6$(s) + 6O_2(g)}$$, what mass of glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass = 180.16 g/mol) can be synthesized from this amount of CO$$_2$$?

Accepted Answer

$$25.8\ \mathrm{g}$$

Question 12

Which of the following is a correct statement about balancing chemical equations?

Accepted Answer

The number of atoms of each element must be the same on both sides of the equation.

Question 13

A 25.0 mL sample of a 0.200 M Na$$_2SO$_4$$ solution is diluted to a final volume of 100.0 mL. What is the final concentration of Na$$_2SO$_4$$?

Accepted Answer

$$0.0500\ \mathrm{M}$$

Question 14

Which of the following ions is a spectator ion in the reaction between aqueous solutions of Na$$_2CO$_3$$ and CaCl$$_2$$?

Accepted Answer

$$\mathrm{Na^+}$$

Question 15

How many moles of KCl are required to completely react with 0.150 L of 0.175 M Pb(NO$$_3$$)$$_2$$ according to the equation $$\mathrm{2KCl(aq) + Pb(NO_3$)_2(aq) \rightarrow $$PbCl_2$$(s) + 2KNO_3(aq)}$$?

Accepted Answer

$$0.0525\ \mathrm{mol}$$

Question 16

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of a solute dissolved in a solvent.

Question 17

A 0.456 mol/L perchlorate solution is available. What volume (in mL) is needed to prepare 250.0 mL of a 0.200 mol/L perchlorate solution?

Accepted Answer

$$109.6\ \mathrm{mL}$$

Question 18

Which of the following is the correct molecular equation for the reaction between aqueous solutions of barium nitrate and sodium sulfate?

Accepted Answer

$$\mathrm{Ba(NO_3$)_2(aq) + Na_2SO_4(aq) \rightarrow $$BaSO_4$$(s) + 2NaNO_3(aq)}$$

Chapter 4: Chemical Reactions and Stoichiometry — Study Notes

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