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$_2$SO$_4$ solution is diluted to a final volume of 100.0 mL. What is the final concentration of Na$_2$SO$_4$?

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$_2$CO$_3$ 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

Study Guide - Practice Questions

Study Guide - Flashcards