ADVANCED CHEM REVIEW 2

If you rewrite the following word equation as a balanced chemical equation, what will be the coefficient and symbol for fluorine?

                        nitrogen trifluoride → nitrogen + fluorine

• 3F

• 6F₂

• F₃

• 3F₂

When the equation, Fe + Cl₂ → FeCl₃, is balanced, what is the coefficient for Cl₂?

• 1

• 2

• 3

• 4

When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide

                 are formed. The balanced equation for this reaction is _________.

• KH + BaCl →KCl + BaH        

• KOH + BaCl → KCl + BaOH

• 2KOH + BaCl₂ →2KCl + Ba(OH)₂

•    KOH + BaCl₂ →K + BaOH

Hydrochloric acid, HF, cannot be stored in glass containers because it reacts with the silicates in glass. The relevant reaction is

Na₂SiO₃ + 8 HF → H₂SiF₆ + 2 NaF + 3 H₂O

          Molar masses (g/mol): Na₂SiO₃ = 122; HF = 20; H₂SiF₆= 144; NaF = 42; H₂O =18

How many moles of HF are required to dissolve 0.500 mol Na₂SiO₃?

• 1.00 mol HF

• 2.00 mol HF

• 4.00 mol HF

• 8.00 mol HF

Hydrochloric acid, HF, cannot be stored in glass containers because it reacts with the silicates in glass. The relevant reaction is

Na₂SiO₃ + 8 HF → H₂SiF₆ + 2 NaF + 3 H₂O

          Molar masses (g/mol): Na₂SiO₃ = 122; HF = 20; H₂SiF₆= 144; NaF = 42; H₂O =18

How many grams of Na2SiO3 can be dissolved by 0.500 mol HF?

• 3.8 g   

• 7.6 g

• 11.5g

• 30.5 g

How many moles of oxygen does it take to react completely with 1.48 mol of aluminum? 4 Al + 3O₂ → 2Al₂O₃

• 1.11. mol O2   

• 1.13 mol O2

• 1.14 mol O2  

• A.    1.15 mol O₂

How many grams of Na₂SO₄ are produced by reaction of 124 g of NaOH with sufficient H₂SO₄?

                                    2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O

            Molar masses(g/mol): NaOH = 40; H₂SO₄ = 98; Na₂SO₄ = 142; H₂O= 18

• 118 g Na₂SO₄

• 119 Na₂SO₄

• 220 Na₂SO₄

• 221Na₂SO₄

Consider the following reaction:

   2ZnS + 3O₂ → 2 ZnO + 2SO₂

            In a certain experiment, 97.5 grams of zinc sulfide undergoes this reaction with 32 grams of oxygen gas. Molar Masses(g/mol): ZnS = 97; ZnO = 81; O₂=32; SO₂=64

What is the limiting reagent?

• ZnS

• O₂

• ZnO    

• SO₂

In the reaction below, 6.8 g carbon monoxide gas was made to react with 7.2 g of hydrogen gas. The reaction produced 5.2 g of methanol.

                                    2 H₂ + CO → CH₃OH

            Molar masses(g/mol): H₂ = 2; CO =28; CH₃OH=32

What is the theoretical yield?

• 57.6 g

• 50.04 g

• 7.8 g

• 6.8 g

If in the reaction CH4 + 2O₂ → CO₂ + 2H₂O, 2.50 g of CO₂ are isolated and the theoretical yield is

                 2.71 g CO₂, what is the percent yield of the reaction?

• 90.3%

• 91.3%

• 92.3%

• 94.3%