Question 1

What is the oxidation number change for the manganese atom in the following unbalanced reduction half-reaction:
Mn O4- (aq) + H+(aq) → Mn2+(aq) + H2O(l)

Accepted Answer

A)  -7
B)  -5
C)  +5
D)  +7

Question 2

Aluminum metal reacts with aqueous iron(II) chloride to form aqueous aluminum chloride and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

Accepted Answer

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

Question 3

What mass of trisodium phosphate is required to prepare 250.0 mL of a solution that is 
In sodium ion?

Accepted Answer

A)  37 g
B)  12 g
C)  7.7 g
D)  4.1 g
E)  3.0 g

Question 4

Which of the following represents a 1.00 M aqueous solution of glucose (C6H12O6) ?

Accepted Answer

A)  90.0 g glucose per 500 mL water
B)  10.0 g glucose per 10.0 mL water
C)  0.180 g glucose per mL solution
D)  0.100 g glucose per mL solution
E)  4.5 g glucose per 4.5 g water

Question 5

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE?
N2(g) + 3 H2(g) → 2 NH3(g)

Accepted Answer

A)  3.5 g of hydrogen are left over.
B)  Hydrogen is the excess reactant.
C)  Nitrogen is the limiting reactant.
D)  The theoretical yield of ammonia is 15 g.

Question 6

How many moles of BCl3 are needed to produce 10.0 g of HCl(aq) in the following reaction?
BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

Accepted Answer

A)  0.0914 mol
B)  0.274 mol
C)  0.823 mol
D)  10.9 mol

Question 7

If 8.52 g each of zinc,potassium dichromate,and sulfuric acid are reacted by the reaction:
4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O
How many grams of zinc will be left unreacted?

Accepted Answer

A)  0.94 g
B)  3.65 g
C)  5.27 g
D)  1.89 g
E)  3.25 g

Question 8

How many moles of H3PO4 are produced when 20.0 g of HCl are produced by the reaction 3PO4 are produced when 20.0 g of HCl are produced by the reaction   A) (20.0/36.5) g B) (20.0/35.5) /5 g C) (20.0/36.5) /5 g D) (20.0/98.0) g E) (20.0/98.0) /5 g" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  (20.0/36.5) g
B)  (20.0/35.5) /5 g
C)  (20.0/36.5) /5 g
D)  (20.0/98.0) g
E)  (20.0/98.0) /5 g

Question 9

For the reaction 2O3 (159.8 g/mol) produce 5.03 g of Fe (55.9 g/mol) .Calculate the extent of reaction ,x. A) 0.362 B) 0.089 C) 0.045 D) 0.092 E) 0.405" class="answers-bank-image d-inline" rel="preload" >
And 7.2 g of Fe2O3 (159.8 g/mol) produce 5.03 g of Fe (55.9 g/mol) .Calculate the extent of reaction ,x.

Accepted Answer

A)  0.362
B)  0.089
C)  0.045
D)  0.092
E)  0.405

Question 10

What is the concentration (M)of sodium ions in 4.57 L of a 0.398 mol L-1  
P(aq)solution?

Accepted Answer

Question 11

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction:
6 HF + Al(OH) 3 + 3 NaOH → Na3AlF6 + 6 H2O
How many grams of cryolite are produced if the reaction has a 94.3% yield and a limiting reagent of 27.8 grams of HF?

Accepted Answer

A)  275 g
B)  48.6 g
C)  45.9 g
D)  15.0 g
E)  15.9 g

Question 12

Given the following reactions:
Fe + Br2 → FeBr2
3 FeBr2 + Br2 → Fe3Br8 
If each reaction is 82.0% efficient,what mass of Fe3Br8 is produced from 1.00 g Fe?

Accepted Answer

A)  4.81 g
B)  3.94 g
C)  2.65 g
D)  3.24 g
E)  2.57 g

Question 13

Given the reaction: 2SO4 are produced by allowing five moles each of KMnO4,KI,and H2SO4 to react? A) 3 mol B) 1 mol C) 2 mol D) 4 mol E) 5 mol" class="answers-bank-image d-inline" rel="preload" >
How many moles of K2SO4 are produced by allowing five moles each of KMnO4,KI,and H2SO4 to react?

Accepted Answer

A)  3 mol
B)  1 mol
C)  2 mol
D)  4 mol
E)  5 mol

Question 14

For the reaction 2O3 (159.8 g/mol) produce how many g of Fe (55.9 g/mol) ? A) 2.5 (55.9/27.0) g B) 2.5 (55.9) (2) /(27.0) (2) g C) 7.2 (55.9) (2) /159.8 g D) 7.2 (55.9/159.8) g E) 2.5 (55.9/159.8) g" class="answers-bank-image d-inline" rel="preload" >
And 7.2 g of Fe2O3 (159.8 g/mol) produce how many g of Fe (55.9 g/mol) ?

Accepted Answer

A)  2.5 (55.9/27.0) g
B)  2.5 (55.9) (2) /(27.0) (2) g
C)  7.2 (55.9) (2) /159.8 g
D)  7.2 (55.9/159.8) g
E)  2.5 (55.9/159.8) g

Question 15

Given the following reactions:
Fe + Br2 → FeBr2
3 FeBr2 + Br2 → Fe3Br8 
If each reaction is 82.0% efficient,what mass of iron is necessary to make 8.45 g of Fe3Br8?

Accepted Answer

A)  0.870 g
B)  3.73 g
C)  2.14 g
D)  1.75 g
E)  2.61 g

Question 16

What is the molarity of 10.9 g KCl dissolved in 150.0 mL of water?

Accepted Answer

A)  0.0727 M
B)  0.146 M
C)  0.975 M
D)  0.0219 M
E)  0.667 M

Question 17

Which metal will produce the most hydrogen per gram of metal?

Accepted Answer

A)  2 Li + 2 HCl → 2 LiCl + H2 
B)  Sn + 4 HCl → SnCl4 + 2 H2 
C)  2 Fe + 6 HCl →2 FeCl3 + 3 H2 
D)  Mg + 2 HCl → MgCl2 + H2 
E)  2 Cr + 6 HCl → 2 CrCl3 + 3H2

Question 18

What is the percent yield if 185 grams of SiO2 are made from 328 g of Cr2O3 by the following equation?
3 Si(s) + 2 Cr2O3(s) → 3 SiO2(s) + 4 Cr(l)

Accepted Answer

A)  142%
B)  70%
C)  56%
D)  105%
E)  95%

Question 19

If 85.6 mL of a 6.75 M solution are diluted to 6.20 L with water,what is the concentration of the final solution?

Accepted Answer

A)  6.75 (6.20/85.6) M
B)  6.75 (8.56/6.20) M
C)  6.75 (6200/85.6) M
D)  6.75 (85.6/6200) M
E)  8.56 (6.20/6.75) M

Question 20

In a solution of alcohol and water that is 70% water,alcohol is the solvent.

Accepted Answer

A) True 
 B)False

Exam 4: Chemical Reactions

In a solution of alcohol and water that is 70% water,alcohol is the solvent.

Correct AnswerverifiedShow Answer

Which of the following represents a 1.00 M aqueous solution of glucose (C6H12O6) ?

Correct AnswerverifiedShow Answer

What mass of trisodium phosphate is required to prepare 250.0 mL of a solution that is In sodium ion?

Correct AnswerverifiedShow Answer

What is the oxidation number change for the manganese atom in the following unbalanced reduction half-reaction: Mn O4- (aq) + H+(aq) → Mn2+(aq) + H2O(l)

Correct AnswerverifiedShow Answer

For the reaction And 7.2 g of Fe2O3 (159.8 g/mol) produce how many g of Fe (55.9 g/mol) ?

Correct AnswerverifiedShow Answer

Given the reaction: How many moles of K2SO4 are produced by allowing five moles each of KMnO4,KI,and H2SO4 to react?

Correct AnswerverifiedShow Answer

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE? N2(g) + 3 H2(g) → 2 NH3(g)

Correct AnswerverifiedShow Answer

If 85.6 mL of a 6.75 M solution are diluted to 6.20 L with water,what is the concentration of the final solution?

Correct AnswerverifiedShow Answer

Given the following reactions: Fe + Br2 → FeBr2 3 FeBr2 + Br2 → Fe3Br8 If each reaction is 82.0% efficient,what mass of iron is necessary to make 8.45 g of Fe3Br8?

Correct AnswerverifiedShow Answer

What is the percent yield if 185 grams of SiO2 are made from 328 g of Cr2O3 by the following equation? 3 Si(s) + 2 Cr2O3(s) → 3 SiO2(s) + 4 Cr(l)

Correct AnswerverifiedShow Answer

Which metal will produce the most hydrogen per gram of metal?

Correct AnswerverifiedShow Answer

If 8.52 g each of zinc,potassium dichromate,and sulfuric acid are reacted by the reaction: 4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O How many grams of zinc will be left unreacted?

Correct AnswerverifiedShow Answer

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction: 6 HF + Al(OH) 3 + 3 NaOH → Na3AlF6 + 6 H2O How many grams of cryolite are produced if the reaction has a 94.3% yield and a limiting reagent of 27.8 grams of HF?

Correct AnswerverifiedShow Answer

Given the following reactions: Fe + Br2 → FeBr2 3 FeBr2 + Br2 → Fe3Br8 If each reaction is 82.0% efficient,what mass of Fe3Br8 is produced from 1.00 g Fe?

Correct AnswerverifiedShow Answer

How many moles of BCl3 are needed to produce 10.0 g of HCl(aq) in the following reaction? BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

Correct AnswerverifiedShow Answer

How many moles of H3PO4 are produced when 20.0 g of HCl are produced by the reaction

Correct AnswerverifiedShow Answer

What is the molarity of 10.9 g KCl dissolved in 150.0 mL of water?

Correct AnswerverifiedShow Answer

For the reaction And 7.2 g of Fe2O3 (159.8 g/mol) produce 5.03 g of Fe (55.9 g/mol) .Calculate the extent of reaction ,x.

Correct AnswerverifiedShow Answer

What is the concentration (M)of sodium ions in 4.57 L of a 0.398 mol L-1 P(aq)solution?

Correct AnswerverifiedShow Answer

Aluminum metal reacts with aqueous iron(II) chloride to form aqueous aluminum chloride and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Which of the following represents a 1.00 M aqueous solution of glucose (C₆H₁₂O₆) ?

Correct Answer
verified

Correct Answer
verified

What is the oxidation number change for the manganese atom in the following unbalanced reduction half-reaction: MnO₄^-(aq) + H⁺(aq) → Mn²⁺(aq) + H₂O(l)

Correct Answer
verified

For the reaction And 7.2 g of Fe₂O₃ (159.8 g/mol) produce how many g of Fe (55.9 g/mol) ?

Correct Answer
verified

Given the reaction: How many moles of K₂SO₄ are produced by allowing five moles each of KMnO₄,KI,and H₂SO₄ to react?

Correct Answer
verified

7.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE? N₂(g) + 3 H₂(g) → 2 NH₃(g)

Correct Answer
verified

Correct Answer
verified

Given the following reactions: Fe + Br₂ → FeBr₂ 3 FeBr₂ + Br₂ → Fe₃Br₈ If each reaction is 82.0% efficient,what mass of iron is necessary to make 8.45 g of Fe₃Br₈?

Correct Answer
verified

What is the percent yield if 185 grams of SiO₂ are made from 328 g of Cr₂O₃ by the following equation? 3 Si(s) + 2 Cr₂O₃(s) → 3 SiO₂(s) + 4 Cr(l)

Correct Answer
verified

Correct Answer
verified

If 8.52 g each of zinc,potassium dichromate,and sulfuric acid are reacted by the reaction: 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄→ 4 ZnSO₄ + 2 CrSO₄ +K₂SO₄ + 7 H₂O How many grams of zinc will be left unreacted?

Correct Answer
verified

Correct Answer
verified

Given the following reactions: Fe + Br₂ → FeBr₂ 3 FeBr₂ + Br₂ → Fe₃Br₈ If each reaction is 82.0% efficient,what mass of Fe₃Br₈ is produced from 1.00 g Fe?

Correct Answer
verified

How many moles of BCl₃ are needed to produce 10.0 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)

Correct Answer
verified

How many moles of H₃PO₄ are produced when 20.0 g of HCl are produced by the reaction

Correct Answer
verified

Correct Answer
verified

For the reaction And 7.2 g of Fe₂O₃ (159.8 g/mol) produce 5.03 g of Fe (55.9 g/mol) .Calculate the extent of reaction ,x.

Correct Answer
verified

What is the concentration (M)of sodium ions in 4.57 L of a 0.398 mol L^-1 P(aq)solution?

Correct Answer
verified

Correct Answer
verified