Question 1

Which of the following pairs of aqueous solutions will produce a precipitate when mixed?

Accepted Answer

A)  HCl + LiOH
B)  Li2S + HCl
C)  K2CO3 + HNO3
D)  MgCl2 + KOH
E)  All of these solution pairs will produce a precipitate.F) A) and B)
G) A) and C)

Question 2

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:
2NaN3(s) → 2Na(s) + 3N2(g) 
How many grams of sodium azide are required to produce 33.0 g of nitrogen?

Accepted Answer

A)  1.77
B)  0.785
C)  76.6
D)  51.1
E)  114.9F) C) and D)
G) B) and D)

Question 3

Define a strong electrolyte.

Accepted Answer

A substance that dis...

Question 4

Which of the following is considered a strong electrolyte?

Accepted Answer

A)  NH4NO3
B)  C12H22O11
C)  PbCl2
D)  HC2H3O2
E)  CH3OHF) A) and E)
G) A) and D)

Question 5

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide:
2Mg(s) + O2(g) → 2MgO(s) 
When 4.00 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

Accepted Answer

A)  4.00
B)  6.63
C)  0.165
D)  3.32
E)  13.3F) B) and E)
G) B) and D)

Question 6

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

Accepted Answer

At least one species is losing electrons...

Question 7

What is the oxidation number of the chromium atom in Na2CrO4?

Accepted Answer

A)  -2
B)  +2
C)  +6
D)  +7E) None of the above
F) A) and B)

Question 8

What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?

Accepted Answer

A)  0.801
B)  0.315
C)  0.629
D)  125
E)  0.400F) B) and D)
G) A) and B)

Question 9

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

Accepted Answer

A)  0.10 M NaCl
B)  0.10 M MgCl2
C)  0.10 M AlCl3
D)  0.05 M CaCl2
E)  All of these solutions have the same concentration of chloride ions.F) C) and D)
G) D) and E)

Question 10

Which of the following is not a strong electrolyte?

Accepted Answer

A)  LiOH
B)  CaCl2
C)  MgCO3
D)  NaC2H3O2
E)  Li2SO4F) A) and C)
G) B) and D)

Question 11

What volume (in mL) of 0.0887 M MgF2 solution is needed to make 275.0 mL of 0.0224 M MgF2 solution?

Accepted Answer

A)  72.3 mL
B)  91.8 mL
C)  10.9 mL
D)  69.4 mL
E)  14.4 mLF) A) and B)
G) A) and E)

Question 12

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum.
____ Al(s) + ____ I2(s) → ____ Al2I6(s)

Accepted Answer

A)  0.741 mol
B)  1.67 mol
C)  2.22 mol
D)  3.33 molE) C) and D)
F) B) and D)

Question 13

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 M NaOH solution?

Accepted Answer

The answer of How many grams of NaOH (MW =...

Question 14

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol,N2H4 = 32.05 g/mol.
N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

Accepted Answer

A)  LR = N2H4,59.0 g N2 formed
B)  LR = N2O4,105 g N2 formed
C)  LR = N2O4,45.7 g N2 formed
D)  LR = N2H4,13.3 g N2 formed
E)  No LR,45.0 g N2 formedF) A) and B)
G) B) and C)

Question 15

Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6Li(s) + N2(g) → 2Li3N(s) 
How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

A)  0.30
B)  1.8
C)  0.20
D)  0.40
E)  3.6F) D) and E)
G) B) and E)

Question 16

Match the following.
-H2SO4(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO4(aq)

Accepted Answer

A)  combustion
B)  acid base
C)  oxidation reduction
D)  gas evolution
E)  precipitationF) B) and C)
G) A) and C)

Question 17

A FeCl3 solution is 0.175 M.How many mL of a 0.175 M FeCl3 solution are needed to make 450.mL of a solution that is 0.300 M in Cl- ion?

Accepted Answer

A)  0.771 mL
B)  257 mL
C)  771 mL
D)  It is not possible to make a more concentrated solution from a less concentrated solution.E) A) and B)
F) All of the above

Question 18

Which of the following pairs of aqueous solutions will react to produce a precipitate?

Accepted Answer

A)  NH4NO3 + Li2CO3
B)  Hg2(NO3) 2 + LiI
C)  NaCl + Li3PO4
D)  AgC2H3O2 + Cu(NO3) 2
E)  None of the above solution pairs will produce a precipitate.F) C) and D)
G) B) and E)

Question 19

How many milliliters of 0.200 M FeCl3 are needed to react with an excess of Na2S to produce 1.38 g of Fe2S3 if the percent yield for the reaction is 65.0%?
3 Na2S(aq) + 2 FeCl3(aq) → Fe2S3(s) + 6 NaCl(aq)

Accepted Answer

A)  25.5 mL
B)  43.1 mL
C)  51.1 mL
D)  102 mLE) A) and B)
F) A) and C)

Question 20

Which of the following compounds is an Arrhenius base?

Accepted Answer

A)  C6H12O6
B)  HOCl
C)  H2SO4
D)  C6H5NH2E) A) and D)
F) A) and C)

Exam 4: Chemical Quantities and Aqueous Reactions

Define a strong electrolyte.

Correct AnswerverifiedA substance that dis...View AnswerShow Answer

Match the following. -H2SO4(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO4(aq)

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What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?

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Which of the following pairs of aqueous solutions will produce a precipitate when mixed?

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Which of the following is considered a strong electrolyte?

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Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + O2(g) → 2MgO(s) When 4.00 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

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How many milliliters of 0.200 M FeCl3 are needed to react with an excess of Na2S to produce 1.38 g of Fe2S3 if the percent yield for the reaction is 65.0%? 3 Na2S(aq) + 2 FeCl3(aq) → Fe2S3(s) + 6 NaCl(aq)

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Which of the following is not a strong electrolyte?

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Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. ____ Al(s) + ____ I2(s) → ____ Al2I6(s)

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How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 M NaOH solution?

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Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol,N2H4 = 32.05 g/mol. N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

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A FeCl3 solution is 0.175 M.How many mL of a 0.175 M FeCl3 solution are needed to make 450.mL of a solution that is 0.300 M in Cl- ion?

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Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + N2(g) → 2Li3N(s) How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

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Which of the following pairs of aqueous solutions will react to produce a precipitate?

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Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3(s) → 2Na(s) + 3N2(g) How many grams of sodium azide are required to produce 33.0 g of nitrogen?

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Which of the following compounds is an Arrhenius base?

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

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

Correct AnswerverifiedAt least one species is losing electrons...View AnswerShow Answer

What volume (in mL) of 0.0887 M MgF2 solution is needed to make 275.0 mL of 0.0224 M MgF2 solution?

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What is the oxidation number of the chromium atom in Na2CrO4?

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A substance that dis...
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Match the following. -H₂SO₄(aq) + 2 LiOH(aq) → 2 H₂O(l) + Li₂SO₄(aq)

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What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H₂SO₄ solution is required to neutralize a 25.0-mL sample of the NaOH solution?

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Correct Answer
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Correct Answer
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Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + O₂(g) → 2MgO(s) When 4.00 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

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How many milliliters of 0.200 M FeCl₃ are needed to react with an excess of Na₂S to produce 1.38 g of Fe₂S₃ if the percent yield for the reaction is 65.0%? 3 Na₂S(aq) + 2 FeCl₃(aq) → Fe₂S₃(s) + 6 NaCl(aq)

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Correct Answer
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Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

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Correct Answer
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Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N₂O₄ and 45.0 g N₂H₄.Some possibly useful molar masses are as follows: N₂O₄ = 92.02 g/mol,N₂H₄ = 32.05 g/mol. N₂O₄(l) + 2 N₂H₄(l) → 3 N₂(g) + 4 H₂O(g)

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A FeCl₃ solution is 0.175 M.How many mL of a 0.175 M FeCl₃solution are needed to make 450.mL of a solution that is 0.300 M in Cl^- ion?

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Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + N₂(g) → 2Li₃N(s) How many moles of lithium are needed to produce 0.60 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

Correct Answer
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Correct Answer
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Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃(s) → 2Na(s) + 3N₂(g) How many grams of sodium azide are required to produce 33.0 g of nitrogen?

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Correct Answer
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Correct Answer
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At least one species is losing electrons...
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What volume (in mL) of 0.0887 M MgF₂ solution is needed to make 275.0 mL of 0.0224 M MgF₂solution?

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What is the oxidation number of the chromium atom in Na₂CrO₄?

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