Question 1

Which of the following statements about balancing chemical equations is TRUE?

Accepted Answer

In a balanced equation, the number of atoms of each element and the total charge must be the same on both sides.

Question 2

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

Accepted Answer

PbSO$$_4$$

Question 3

A student mixes aqueous solutions of K$$_2CO$_3$$ and NiCl$$_2. $$What is the net ionic equation for the precipitation reaction that occurs?

Accepted Answer

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

Question 4

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 5

What is the correct balanced equation for the combustion of propane ($$C_3H_8) in $$oxygen?

Accepted Answer

$$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$$

Question 6

A plant consumes 37.8 g of CO$$_2 in $$one week. How many grams of glucose ($$C_6H_{12}O_6$) can be synthesized, assuming excess water? (Molar masses: CO_2$ = 44.01 g/mol, C_6H$$_{12}$$O_6 = 180.16 g/$$mol)

Accepted Answer

25.8 g

Question 7

Which of the following ions is a spectator ion in the reaction: $$Pb(NO_3$)_2(aq) + 2KI(aq) \rightarrow $$PbI_2$$(s) + 2KNO_3(aq)$$?

Accepted Answer

$$K^+$$

Question 8

What is the molarity of a solution prepared by dissolving 7.89 g of calcium acetate ($$Ca(C_2H_3O_2)_2$$, molar mass = 158.17 g/mol) in enough water to make 1.00 L of solution?

Accepted Answer

$$0.0999$$ mol/L

Question 9

If 0.150 L of 0.175 M $$Pb(NO_3$)_2 is $$mixed with $$KCl$$ solution, what volume (in L) of 0.150 M $$KCl is $$required to completely react according to the equation: $$2KCl(aq) + Pb(NO_3$)_2(aq) \rightarrow $$PbCl_2$$(s) + 2KNO_3(aq)$$?

Accepted Answer

0.350 L

Question 10

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

Accepted Answer

The reactant that determines the maximum amount of product formed.

Question 11

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 of 0.20 mol/L AgNO$$_3$$ must be added to precipitate all chloride ions?

Accepted Answer

0.29 L

Question 12

Which of the following is the correct formula for the polyatomic ion sulfate?

Accepted Answer

$$SO_4$$^{2-}$$

Question 13

What is the percent yield if 8.2 g of TiO$$_2 ($$molar mass = 79.87 g/mol) reacts with excess carbon to produce 2.5 g of Ti (molar mass = 47.87 g/mol) according to $$TiO_2(s) + 2C(s$$) \rightarrow Ti(s) + 2CO(g)$$?

Accepted Answer

51.9%

Question 14

Which of the following is NOT a step in the recommended process for solving stoichiometry problems?

Accepted Answer

Adjust significant figures after every calculation step.

Question 15

Which of the following statements about molarity is CORRECT?

Accepted Answer

Molarity is defined as the number of moles of solute per liter of solution.

Question 16

Which of the following compounds is a non-electrolyte when dissolved in water?

Accepted Answer

C$$_{12}H$_{22}O$_{11} ($$sucrose)

Question 17

A 0.456 mol/L perchlorate solution is used to prepare 200 mL of a solution that is 0.200 mol/L in perchlorate ions. What volume of the stock solution is required?

Accepted Answer

87.7 mL

Question 18

Which of the following is the correct molecular equation for the reaction between yttrium(III) nitrate and ammonium sulfide in water?

Accepted Answer

$$2Y(NO_3$)_3(aq) + 3(NH_4$)_2S(aq) \rightarrow Y_2S_3(s) + 6NH_4NO_3(aq)$$

Chapter 4: Chemical Reactions and Stoichiometry — Study Notes

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