Question 1

What precipitate is most likely formed from a solution containing Ca2+,Na+,OH-,and CO32-.

Accepted Answer

A)  NaOH 
B)  CaCO3 
C)  Na2CO3 
D)  Ca(OH)2 
A)  NaOH 
B)  CaCO3 
C)  Na2CO3 
D)  Ca(OH)2

Question 2

What is the concentration of nitrate ions in a 0.225 M Sr(NO3)2 solution?

Accepted Answer

A)  0.225 M 
B)  0.112 M 
C)  0.675 M 
D)  0.450 M 
E)  0.725 M 
A)  0.225 M 
B)  0.112 M 
C)  0.675 M 
D)  0.450 M 
E)  0.725 M

Question 3

Which one of the following compounds behaves as an acid when dissolved in water?

Accepted Answer

A)  SrO 
B)  C3H8 
C)  HBr 
D)  RbOH 
A)  SrO 
B)  C3H8 
C)  HBr 
D)  RbOH

Question 4

Which substance is the limiting reactant when 12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide according to the following chemical equation? 2 S(s)+ 3 O2(g)+ 4 NaOH(aq)→ 2 Na2SO4(aq)+ 2 H2O(l)

Accepted Answer

A)  S(s) 
B)  O2(g) 
C)  NaOH(aq) 
D)  None of these substances is the limiting reactant. 
A)  S(s) 
B)  O2(g) 
C)  NaOH(aq) 
D)  None of these substances is the limiting reactant.

Question 5

How many grams of NaOH (MW = 40.0)are in 150.0 mL of a 0.300 M NaOH solution?

Accepted Answer

A)  12.00 g 
B)  1.80 g 
C)  0.300 g 
D)  1.50 g 
E)  18.0 g 
A)  12.00 g 
B)  1.80 g 
C)  0.300 g 
D)  1.50 g 
E)  18.0 g

Question 6

How many iodide ions are present in 65.5 mL of 0.210 M AlI3 solution?

Accepted Answer

A)  4.02 × 1023 iodide ions 
B)  5.79 × 1024 iodide ions 
C)  2.48 × 1022 iodide ions 
D)  8.28 × 1021 iodide ions 
E)  1.21 × 1022 iodide ions 
A)  4.02 × 1023 iodide ions 
B)  5.79 × 1024 iodide ions 
C)  2.48 × 1022 iodide ions 
D)  8.28 × 1021 iodide ions 
E)  1.21 × 1022 iodide ions

Question 7

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 7.000 moles of C8H18 with 14.00 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Accepted Answer

A)  11.42% 
B)  14.28% 
C)  28.56% 
D)  7.140% 
E)  39.00 
A)  11.42% 
B)  14.28% 
C)  28.56% 
D)  7.140% 
E)  39.00

Question 8

How can you tell if a reaction is an oxidation-reduction reaction?

Accepted Answer

At least one species is losing electrons

Question 9

List the spectator ions in the following reaction.
Ba+2(aq)+ 2 OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na +(aq)+ 2 OH-(aq)+ BaCO3(s)

Accepted Answer

Question 10

Identify the species oxidized. 2 Al3+(aq)+ 2 Fe(s)→ 2 Al(s)+ 3 Fe2+(aq)

Accepted Answer

A)  Al3+ 
B)  Fe 
C)  Al 
D)  Fe2+ 
E)  This is not an oxidation-reduction reaction. 
A)  Al3+ 
B)  Fe 
C)  Al 
D)  Fe2+ 
E)  This is not an oxidation-reduction reaction.

Question 11

What is the molarity of a NaOH solution if 28.2 mL of a 0.112 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?

Accepted Answer

A)  0.253 
B)  0.0993 
C)  0.199 
D)  39.5 
E)  0.126 
A)  0.253 
B)  0.0993 
C)  0.199 
D)  39.5 
E)  0.126

Question 12

Based on the balanced chemical equation shown below,determine the mass percent of Fe3+ in a   sample of iron ore,if 22.40 mL of a 0.1000 M stannous chloride,SnCl2(aq),solution is required to completely react with the Fe3+ present in the ore sample.The chemical equation for the reaction is 2 Fe3+(aq)+ Sn2+(aq)→ 2 Fe2+(aq)+ Sn4+(aq).

Accepted Answer

A)  7.333% 
B)  11.48% 
C)  22.95% 
D)  45.91% 
A)  7.333% 
B)  11.48% 
C)  22.95% 
D)  45.91%

Question 13

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

A)  CsI(aq) + NaOH(aq) 
B)  HCl(aq) + Ca(OH)2(aq) 
C)  Na2SO4(aq) + Ba (NO3)2(aq) 
D)  KNO3(aq) + NH4F(aq) 
A)  CsI(aq) + NaOH(aq) 
B)  HCl(aq) + Ca(OH)2(aq) 
C)  Na2SO4(aq) + Ba (NO3)2(aq) 
D)  KNO3(aq) + NH4F(aq)

Question 14

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction. Fe2O3(s)+ 2 Al(s)→ Al2O3(s)+ 2 Fe(s)

Accepted Answer

A)  61.03% 
B)  28.65% 
C)  57.30% 
D)  20.02% 
E)  81.93% 
A)  61.03% 
B)  28.65% 
C)  57.30% 
D)  20.02% 
E)  81.93%

Question 15

Choose the statement below that is TRUE.

Accepted Answer

A)  A weak acid solution consists of mostly nonionized acid molecules. 
B)  The term "strong electrolyte" means that the substance is extremely reactive. 
C)  A strong acid solution consists of only partially ionized acid molecules. 
D)  The term "weak electrolyte" means that the substance is inert. 
E)  A molecular compound that does not ionize in solution is considered a strong electrolyte. 
A)  A weak acid solution consists of mostly nonionized acid molecules. 
B)  The term "strong electrolyte" means that the substance is extremely reactive. 
C)  A strong acid solution consists of only partially ionized acid molecules. 
D)  The term "weak electrolyte" means that the substance is inert. 
E)  A molecular compound that does not ionize in solution is considered a strong electrolyte.

Question 16

Which of the following solutions will have the highest concentration of fluoride ions?

Accepted Answer

A)  0.10 M KF 
B)  0.10 M SrF2 
C)  0.10 M AlF3 
D)  0.05 M CaF2 
E)  All of these solutions have the same concentration of chloride ions. 
A)  0.10 M KF 
B)  0.10 M SrF2 
C)  0.10 M AlF3 
D)  0.05 M CaF2 
E)  All of these solutions have the same concentration of chloride ions.

Question 17

Determine the theoretical yield of H2S (in moles)if 32 mol Al2S3 and 32 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s)+ 6 H2O(l)→ 2 Al(OH)3(s)+ 3 H2S(g)

Accepted Answer

A)  96 mol H2S 
B)  32 mol H2S 
C)  64 mol H2S 
D)  48 mol H2S 
E)  16 mol H2S 
A)  96 mol H2S 
B)  32 mol H2S 
C)  64 mol H2S 
D)  48 mol H2S 
E)  16 mol H2S

Question 18

Calculate the concentration (M)of sodium ions in a solution made by diluting 60.0 mL of a 0.374 M solution of sodium sulfide to a total volume of 350 mL.

Accepted Answer

A)  0.128 
B)  0.0640 
C)  0.0320 
D)  0.70 
E)  2.00 
A)  0.128 
B)  0.0640 
C)  0.0320 
D)  0.70 
E)  2.00

Question 19

Based on the balanced chemical equation shown below,determine the molarity of a solution containing Fe2+(aq),if 40.00 mL of the Fe2+(aq)solution is required to completely react with 30.00 mL of a 0.125 M potassium bromate,KBrO3(aq),solution.The chemical equation for the reaction is 6 Fe2+(aq)+ BrO3-(aq)+ 6 H+(aq)→ 6 Fe3+(aq)+ Br-(aq)+ 3 H2O(l).

Accepted Answer

A)  0.0156 M 
B)  0.0938 M 
C)  0.562 M 
D)  1.00 M 
A)  0.0156 M 
B)  0.0938 M 
C)  0.562 M 
D)  1.00 M

Question 20

How would the concentration change if a 1.0 L flask of 1.0 M NaCl were left uncapped on a laboratory bench for several days? Why?

Accepted Answer

The concentration would slowly

Exam 4: Chemical Quantities and Aqueous Reactions

What precipitate is most likely formed from a solution containing Ca2+,Na+,OH-,and CO32-.

What is the concentration of nitrate ions in a 0.225 M Sr(NO3)2 solution?

Which one of the following compounds behaves as an acid when dissolved in water?

Which substance is the limiting reactant when 12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide according to the following chemical equation? 2 S(s)+ 3 O2(g)+ 4 NaOH(aq)→ 2 Na2SO4(aq)+ 2 H2O(l)

How many grams of NaOH (MW = 40.0)are in 150.0 mL of a 0.300 M NaOH solution?

How many iodide ions are present in 65.5 mL of 0.210 M AlI3 solution?

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 7.000 moles of C8H18 with 14.00 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

How can you tell if a reaction is an oxidation-reduction reaction?

List the spectator ions in the following reaction. Ba+2(aq)+ 2 OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na +(aq)+ 2 OH-(aq)+ BaCO3(s)

Identify the species oxidized. 2 Al3+(aq)+ 2 Fe(s)→ 2 Al(s)+ 3 Fe2+(aq)

What is the molarity of a NaOH solution if 28.2 mL of a 0.112 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?

The mixing of which pair of reactants will result in a precipitation reaction?

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction. Fe2O3(s)+ 2 Al(s)→ Al2O3(s)+ 2 Fe(s)

Choose the statement below that is TRUE.

Which of the following solutions will have the highest concentration of fluoride ions?

Determine the theoretical yield of H2S (in moles)if 32 mol Al2S3 and 32 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s)+ 6 H2O(l)→ 2 Al(OH)3(s)+ 3 H2S(g)

Calculate the concentration (M)of sodium ions in a solution made by diluting 60.0 mL of a 0.374 M solution of sodium sulfide to a total volume of 350 mL.

How would the concentration change if a 1.0 L flask of 1.0 M NaCl were left uncapped on a laboratory bench for several days? Why?

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Filters

What precipitate is most likely formed from a solution containing Ca²⁺,Na⁺,OH^-,and CO₃^2-.

What is the concentration of nitrate ions in a 0.225 M Sr(NO₃)₂ solution?

Which substance is the limiting reactant when 12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide according to the following chemical equation? 2 S(s)+ 3 O₂(g)+ 4 NaOH(aq)→ 2 Na₂SO₄(aq)+ 2 H₂O(l)

How many iodide ions are present in 65.5 mL of 0.210 M AlI₃ solution?

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 7.000 moles of C₈H₁₈ with 14.00 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

List the spectator ions in the following reaction. Ba⁺²(aq)+ 2 OH^-(aq)+ 2 Na⁺(aq)+ CO₃^-2(aq)→ 2 Na ⁺(aq)+ 2 OH^-(aq)+ BaCO₃(s)

Identify the species oxidized. 2 Al³⁺(aq)+ 2 Fe(s)→ 2 Al(s)+ 3 Fe²⁺(aq)

What is the molarity of a NaOH solution if 28.2 mL of a 0.112 M H₂SO₄ solution is required to neutralize a 25.0-mL sample of the NaOH solution?

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s)+ 2 Al(s)→ Al₂O₃(s)+ 2 Fe(s)

Determine the theoretical yield of H₂S (in moles)if 32 mol Al₂S₃ and 32 mol H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is Al₂S₃= 150.17 g/mol. Al₂S₃(s)+ 6 H₂O(l)→ 2 Al(OH)₃(s)+ 3 H₂S(g)