Question 1

An FeCl3 solution is 0.175 M.How many mL of a 0.175 M FeCl3 solution are needed to make 550.mL of a solution that is 0.300 M in Cl- ion?

Accepted Answer

A)  0.943 mL 
B)  314 mL 
C)  943 mL 
D)  It is not possible to make a more concentrated solution from a less concentrated solution.

Question 2

What element is undergoing oxidation (if any)in the following reaction? CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(g)

Accepted Answer

A)  O 
B)  H 
C)  C 
D)  both C and H 
E)  None of the elements is undergoing oxidation.

Question 3

Determine the oxidizing agent in the following reaction. Ni(s)+ 2 AgClO4(aq)→ Ni(ClO4)2(aq)+ 2 Ag(s)

Accepted Answer

A)  Ag 
B)  Ni 
C)  Cl 
D)  O 
E)  This is not an oxidation-reduction reaction.

Question 4

Determine the oxidation state of C in CO3-2.

Accepted Answer

A)  +4 
B)  +1 
C)  -3 
D)  +5 
E)  -6

Question 5

Which of the following is an oxidation-reduction reaction?

Accepted Answer

A)  HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l) 
B)  NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq) 
C)  Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq) 
D)  Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g) 
E)  All of the above are oxidation-reduction reactions.

Question 6

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO2 if there is plenty of water present? 3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

Accepted Answer

A)  37.98 moles NO 
B)  18.99 moles NO 
C)  12.66 moles NO 
D)  8.44 moles NO 
E)  4.22 moles NO

Question 7

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

Accepted Answer

A)  Mg(NO3)2(aq) + K2CO3(aq) 
B)  Na2SO4(aq) + Cu(NO3)2(aq) 
C)  LiClO4(aq) + (NH4)2S(aq) 
D)  NH4Cl(aq) + NH4I(aq)

Question 8

How many moles of KF are required to make 200 mL of a 3.00 M solution?

Accepted Answer

A)  0.200 moles 
B)  0.600 moles 
C)  3.00 moles 
D)  0.450 moles 
E)  0.800 moles

Question 9

How many H+ ions can the acid CH3CO2H donate per molecule?

Accepted Answer

A)  3 
B)  2 
C)  1 
D)  0

Question 10

How many of the following compounds are insoluble in water? KC2H3O2 CaSO4 K2S AlPO4

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 11

Identify the reducing agent. 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.

Question 12

Define a limiting reagent.

Accepted Answer

The answer of Define a limiting reagent....

Question 13

Which of the compounds H2C2O, Ca(OH)2,NaOH,and HI behave as acids when they are dissolved in water?

Accepted Answer

A)  Ca(OH)2 and NaOH 
B)  H2C2O4 and HI 
C)  only HI 
D)  only NaOH

Question 14

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ H2O(l)→ Ca(OH)2(s)
In a particular experiment,a 2.50-g sample of CaO is reacted with excess water and 2.80 g of Ca(OH)2 is recovered.What is the percent yield in this experiment?

Accepted Answer

A)  112 
B)  1.12 
C)  3.60 
D)  84.9 
E)  89.2

Question 15

How many liters of a 0.0550 M NaF solution contain 0.163 moles of NaF?

Accepted Answer

A)  3.37 L 
B)  1.48 L 
C)  8.97 L 
D)  2.96 L 
E)  1.12 L

Question 16

How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2. 2 H2S(g)+ SO2(g)→ 3 S(s)+ 2 H2O(l)

Accepted Answer

A)  1.48 × 1024 molecules H2S 
B)  9.89 × 1023 molecules H2S 
C)  5.06 × 1025 molecules H2S 
D)  3.17 × 1025 molecules H2S 
E)  2.44 × 1023 molecules H2S

Question 17

Based on the balanced chemical equation shown below,what volume of 0.250 M K2S2O3(aq),is needed to completely react with 12.44 mL of 0.125 M KI3(aq),according to the following chemical equation. 2 S2O32-(aq)+ I3-(aq)→ S4O62-(aq)+ 3 I-(aq)

Accepted Answer

A)  3.11 mL 
B)  6.22 mL 
C)  12.4 mL 
D)  49.8 mL

Question 18

Explain the difference between a strong and weak electrolyte.Give an example of each.

Accepted Answer

The answer of Explain the difference between a strong and...

Question 19

The titration of 80.0 mL of an unknown concentration H3PO4 solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H3PO4 solution (in M)?

Accepted Answer

A)  1.03 M 
B)  0.343 M 
C)  0.114 M 
D)  0.138 M 
E)  0.0461 M

Question 20

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of lithium sulfide and copper(II)nitrate are mixed.

Accepted Answer

A)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → Cu2+(aq) + S2-(aq) + 2 Li+(aq) + 2 NO3-(aq) 
B)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 LiNO3(s) 
C)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → Cu2+(aq) + S2-(aq) + 2 LiNO3(s) 
D)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 Li+(aq) + 2 NO3-(aq) 
E)  No reaction occurs.

Exam 4: Chemical Quantities and Aqueous Reactions

An FeCl₃ solution is 0.175 M.How many mL of a 0.175 M FeCl₃solution are needed to make 550.mL of a solution that is 0.300 M in Cl^- ion?

What element is undergoing oxidation (if any) in the following reaction? CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2 Ag(s)

Determine the oxidation state of C in CO₃^-2.

Which of the following is an oxidation-reduction reaction?

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

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

How many moles of KF are required to make 200 mL of a 3.00 M solution?

How many H⁺ ions can the acid CH₃CO₂H donate per molecule?

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ K₂S AlPO₄

Identify the reducing agent. 2 Al³⁺(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe²⁺(aq)

Define a limiting reagent.

Which of the compounds H₂C₂O_, Ca(OH) ₂,NaOH,and HI behave as acids when they are dissolved in water?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + H₂O(l) → Ca(OH) ₂(s) In a particular experiment,a 2.50-g sample of CaO is reacted with excess water and 2.80 g of Ca(OH) ₂ is recovered.What is the percent yield in this experiment?

How many liters of a 0.0550 M NaF solution contain 0.163 moles of NaF?

How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO₂. 2 H₂S(g) + SO₂(g) → 3 S(s) + 2 H₂O(l)

Based on the balanced chemical equation shown below,what volume of 0.250 M K₂S₂O₃(aq) ,is needed to completely react with 12.44 mL of 0.125 M KI₃(aq) ,according to the following chemical equation. 2 S₂O₃^2-(aq) + I₃^-(aq) → S₄O₆^2-(aq) + 3 I^-(aq)

Explain the difference between a strong and weak electrolyte.Give an example of each.

The titration of 80.0 mL of an unknown concentration H₃PO₄ solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H₃PO₄ solution (in M) ?

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.

Exam 4: Chemical Quantities and Aqueous Reactions

An FeCl3 solution is 0.175 M.How many mL of a 0.175 M FeCl3 solution are needed to make 550.mL of a solution that is 0.300 M in Cl- ion?

What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO4(aq) → Ni(ClO4) 2(aq) + 2 Ag(s)

Determine the oxidation state of C in CO3-2.

Which of the following is an oxidation-reduction reaction?

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

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

How many moles of KF are required to make 200 mL of a 3.00 M solution?

How many H+ ions can the acid CH3CO2H donate per molecule?

How many of the following compounds are insoluble in water? KC2H3O2 CaSO4 K2S AlPO4

Identify the reducing agent. 2 Al3+(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe2+(aq)

Define a limiting reagent.

Which of the compounds H2C2O, Ca(OH) 2,NaOH,and HI behave as acids when they are dissolved in water?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + H2O(l) → Ca(OH) 2(s) In a particular experiment,a 2.50-g sample of CaO is reacted with excess water and 2.80 g of Ca(OH) 2 is recovered.What is the percent yield in this experiment?

How many liters of a 0.0550 M NaF solution contain 0.163 moles of NaF?

How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2. 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(l)

Based on the balanced chemical equation shown below,what volume of 0.250 M K2S2O3(aq) ,is needed to completely react with 12.44 mL of 0.125 M KI3(aq) ,according to the following chemical equation. 2 S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3 I-(aq)

Explain the difference between a strong and weak electrolyte.Give an example of each.

The titration of 80.0 mL of an unknown concentration H3PO4 solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H3PO4 solution (in M) ?

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.

An FeCl₃ solution is 0.175 M.How many mL of a 0.175 M FeCl₃solution are needed to make 550.mL of a solution that is 0.300 M in Cl^- ion?

What element is undergoing oxidation (if any) in the following reaction? CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2 Ag(s)

Determine the oxidation state of C in CO₃^-2.

According to the following balanced reaction,how many moles of NO are formed from 12.66 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

How many H⁺ ions can the acid CH₃CO₂H donate per molecule?

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ K₂S AlPO₄

Identify the reducing agent. 2 Al³⁺(aq) + 2 Fe(s) → 2 Al(s) + 3 Fe²⁺(aq)

Which of the compounds H₂C₂O_, Ca(OH) ₂,NaOH,and HI behave as acids when they are dissolved in water?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + H₂O(l) → Ca(OH) ₂(s) In a particular experiment,a 2.50-g sample of CaO is reacted with excess water and 2.80 g of Ca(OH) ₂ is recovered.What is the percent yield in this experiment?

How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO₂. 2 H₂S(g) + SO₂(g) → 3 S(s) + 2 H₂O(l)

Based on the balanced chemical equation shown below,what volume of 0.250 M K₂S₂O₃(aq) ,is needed to completely react with 12.44 mL of 0.125 M KI₃(aq) ,according to the following chemical equation. 2 S₂O₃^2-(aq) + I₃^-(aq) → S₄O₆^2-(aq) + 3 I^-(aq)

The titration of 80.0 mL of an unknown concentration H₃PO₄ solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H₃PO₄ solution (in M) ?