Question 1

How many moles of nitrogen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g mol-1. 
4KNO3(s)  → 2K2O(s)  + 2N2(g)  + 5O2(g)

Accepted Answer

A)   0.290 mol N2
B)   0.580 mol N2
C)   18.5 mol N2
D)   0.724 mol N2
E)   1.73 mol N2F) B) and C)
G) C) and E)

Question 2

Define an electrolyte.

Accepted Answer

A substance that dis...

Question 3

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

Accepted Answer

A)   0.10 mol L-1 NaCl
B)   0.10 mol L-1 MgCl2
C)   0.10 mol L-1 AlCl3
D)   0.05 mol L-1 CaCl2
E)   All of these solutions have the same concentration of chloride ions.F) A) and E)
G) A) and B)

Question 4

How many millilitres of a 0.266 mol L-1 LiNO3 solution are required to make 150.0 mL of 0.075 mol L-1 LiNO3 solution?

Accepted Answer

A)   53.2 mL
B)   42.3 mL
C)   18.8 mL
D)   23.6 mL
E)   35.1 mLF) A) and C)
G) None of the above

Question 5

Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO3? Assume that there is excess NO2 present. The molar masses are as follows: 
H2O = 18.02 g mol-1, HNO3 = 63.02 g mol-1. 3NO2(g)  + H2O(l)  → 2HNO3(aq)  + NO(g)

Accepted Answer

A)   38.0 g H2O
B)   21.7 g H2O
C)   43.4 g H2O
D)   10.9 g H2O
E)   26.5 g H2OF) None of the above
G) A) and B)

Question 6

Identify the oxidation state of Mg in Mg(s) . 
Mg(s)  + 2HCl(aq)  → MgCl2(aq)  + H2(g)

Accepted Answer

A)   +1
B)   +2
C)   0
D)   -1
E)   -2F) B) and E)
G) C) and D)

Question 7

What is the concentration of HCl in the final solution when 65 mL of a 12 mol L-1 HCl solution is diluted with pure water to a total volume of 0.15 L?

Accepted Answer

A)   2.8 × 10-2 mol L-1
B)   5.2 mol L-1
C)   28 mol L-1
D)   5.2 × 103 mol L-1E) None of the above
F) A) and D)

Question 8

According to the following balanced reaction, how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 
3NO2(g)  + H2O(l)  → 2HNO3(aq)  + NO(g)

Accepted Answer

A)   2.81 moles HNO3
B)   25.3 moles HNO3
C)   8.44 moles HNO3
D)   5.63 moles HNO3
E)   1.83 moles HNO3F) A) and C)
G) A) and B)

Question 9

How would the concentration change if a 1.0 L flask of 1.0 mol L-1 NaCl were left uncapped on a laboratory bench for several days? Why?

Accepted Answer

The concentration would slowly...

Question 10

What is the oxidation number of the sulfur atom in K2SO4?

Accepted Answer

A)   -2
B)   +2
C)   +4
D)   +6E) A) and D)
F) A) and C)

Question 11

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)   K2SO4(aq)  + Ba(NO3) 2(aq) 
D)   NaNO3(aq)  + NH4Cl(aq) E) A) and C)
F) C) and D)

Question 12

According to the following reaction, how many moles of Fe(OH) 2 can form from 175.0 mL of 0.227 mol L-1 LiOH solution? Assume that there is excess FeCl2. 
FeCl2(aq)  + 2LiOH(aq)  → Fe(OH) 2(s)  + 2LiCl(aq)

Accepted Answer

A)   3.97 × 10-2 moles
B)   2.52 × 10-2 moles
C)   1.99 × 10-2 moles
D)   5.03 × 10-2 moles
E)   6.49 × 10-2 molesF) C) and D)
G) A) and B)

Question 13

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

Accepted Answer

A)   LiOH + Na2S
B)   (NH4) 2SO4 + LiCl
C)   Sr(C2H3O2) 2 + Na2SO4
D)   KNO3 + NaOH
E)   None of the above solution pairs will produce a precipitate.F) D) and E)
G) B) and C)

Question 14

Identify the net ionic equation for the reaction (if any)  that occurs when aqueous solutions of Al(C2H3O2) 3 and LiNO3 are mixed.

Accepted Answer

A)   Al3+(aq)  + 3NO3-(aq)  → Al(NO3) 3(s) 
B)   Li+(aq)  + C2H3O2-(aq)  → LiC2H3O2(s) 
C)   Al3+(aq)  + 3NO3-(aq)  + Li+(aq)  + C2H3O2-(aq)  → Al(NO3) 3(aq)  + LiC2H3O2(s) 
D)   3Li+(aq)  + (C2H3O2) 33-(aq)  → Li3(C2H3O2) 3(s) 
E)   No reaction occurs.F) B) and E)
G) B) and D)

Question 15

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients?
 ________ C3H6O(l)  + ________ O2(g)  → ________ CO2(g)  + ________ H2O(l)

Accepted Answer

A)   1
B)   3
C)   5
D)   4E) A) and C)
F) C) and D)

Question 16

What are the required coefficients to properly balance the following chemical reaction? 
Cu(s)  + S(s)  → Cu2S(s)

Accepted Answer

A)   1, 1, 2S(s)  
A)   1, 1,   
B)   1, 1, 1 
C)   1, 1, 2 
D)   2, 1, 1 
E)   2, 1, 2" class="answers-bank-image d-inline" rel="preload" >
B)   1, 1, 1
C)   1, 1, 2
D)   2, 1, 1
E)   2, 1, 2F) A) and D)
G) None of the above

Question 17

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction? MnO4⁻ (aq)  + H2C2O4(aq)  → Mn2+(aq)  + CO2(g)

Accepted Answer

A)   H2C2O4 = 5, H2O = 8
B)   H2C2O4 = 1, H2O = 1
C)   H2C2O4 = 5, H2O = 1
D)   H2C2O4 = 1, H2O = 4
E)   H2C2O4 = 3, H2O = 2F) A) and E)
G) B) and E)

Question 18

Identify the net ionic equation for the reaction (if any)  that occurs when aqueous solutions of MgSO3 and HI are mixed.

Accepted Answer

A)   2H+(aq)  + SO32-(aq)  → H2SO3(s) 
B)   Mg2+(aq)  + 2I-(aq)  → MgI2(s) 
C)   2H+(aq)  + SO32-(aq)  + Mg2+(aq)  + 2I-(aq)  → H2SO3(s)  + MgI2(aq) 
D)   2H+(aq)  + SO32-(aq)  → H2O(l)  + SO2(g) 
E)   No reaction occurs.F) A) and C)
G) A) and D)

Question 19

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

Accepted Answer

A strong electrolyte is either an ionic ...

Question 20

What are the required coefficients to properly balance the following chemical reaction? 
Na(s)  + H2O(l)  → H2(g)  + NaOH(aq)

Accepted Answer

A)   1, 2, 2, 1
B)   2, 2, 1, 1
C)   2, 1, 1, 1
D)   2, 1, 2, 1
E)   2, 2, 1, 2F) B) and E)
G) None of the above

Exam 4: Chemical Reactions and Stoichiometry

How many millilitres of a 0.266 mol L-1 LiNO3 solution are required to make 150.0 mL of 0.075 mol L-1 LiNO3 solution?

Correct AnswerverifiedShow Answer

Define an electrolyte.

Correct AnswerverifiedA substance that dis...View AnswerShow Answer

What are the required coefficients to properly balance the following chemical reaction? Na(s) + H2O(l) → H2(g) + NaOH(aq)

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What is the oxidation number of the sulfur atom in K2SO4?

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Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction? MnO4⁻ (aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

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

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What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? ________ C3H6O(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

Correct AnswerverifiedShow Answer

How would the concentration change if a 1.0 L flask of 1.0 mol L-1 NaCl were left uncapped on a laboratory bench for several days? Why?

Correct AnswerverifiedThe concentration would slowly...View AnswerShow Answer

Identify the oxidation state of Mg in Mg(s) . Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

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What are the required coefficients to properly balance the following chemical reaction? Cu(s) + S(s) → Cu2S(s)

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

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Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO3? Assume that there is excess NO2 present. The molar masses are as follows: H2O = 18.02 g mol-1, HNO3 = 63.02 g mol-1. 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

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

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What is the concentration of HCl in the final solution when 65 mL of a 12 mol L-1 HCl solution is diluted with pure water to a total volume of 0.15 L?

Correct AnswerverifiedShow Answer

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed.

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According to the following reaction, how many moles of Fe(OH) 2 can form from 175.0 mL of 0.227 mol L-1 LiOH solution? Assume that there is excess FeCl2. FeCl2(aq) + 2LiOH(aq) → Fe(OH) 2(s) + 2LiCl(aq)

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

Correct AnswerverifiedA strong electrolyte is either an ionic ...View AnswerShow Answer

How many moles of nitrogen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g mol-1. 4KNO3(s) → 2K2O(s) + 2N2(g) + 5O2(g)

Correct AnswerverifiedShow Answer

According to the following balanced reaction, how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Correct AnswerverifiedShow Answer

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C2H3O2) 3 and LiNO3 are mixed.

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How many millilitres of a 0.266 mol L^-1 LiNO₃ solution are required to make 150.0 mL of 0.075 mol L^-1 LiNO₃ solution?

Correct Answer
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Correct Answer
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A substance that dis...
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What are the required coefficients to properly balance the following chemical reaction? Na(s) + H₂O(l) → H₂(g) + NaOH(aq)

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What is the oxidation number of the sulfur atom in K₂SO₄?

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Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H₂C₂O₄and H₂O in the balanced reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

Correct Answer
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Correct Answer
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What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? C₃H₆O(l) + O₂(g) → CO₂(g) + H₂O(l)

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How would the concentration change if a 1.0 L flask of 1.0 mol L^-1 NaCl were left uncapped on a laboratory bench for several days? Why?

Correct Answer
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The concentration would slowly...
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Identify the oxidation state of Mg in Mg(s) . Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

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What are the required coefficients to properly balance the following chemical reaction? Cu(s) + S(s) → Cu₂S(s)

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Correct Answer
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Consider the following balanced reaction. How many grams of water are required to form 75.9 g of HNO₃? Assume that there is excess NO₂ present. The molar masses are as follows: H₂O = 18.02 g mol^-1, HNO₃ = 63.02 g mol^-1. 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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Correct Answer
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What is the concentration of HCl in the final solution when 65 mL of a 12 mol L^-1 HCl solution is diluted with pure water to a total volume of 0.15 L?

Correct Answer
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Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Correct Answer
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According to the following reaction, how many moles of Fe(OH) ₂ can form from 175.0 mL of 0.227 mol L^-1 LiOH solution? Assume that there is excess FeCl₂. FeCl₂(aq) + 2LiOH(aq) → Fe(OH) ₂(s) + 2LiCl(aq)

Correct Answer
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Correct Answer
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A strong electrolyte is either an ionic ...
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How many moles of nitrogen are formed when 58.6 g of KNO₃ decomposes according to the following reaction? The molar mass of KNO₃ is 101.11 g mol^-1. 4KNO₃(s) → 2K₂O(s) + 2N₂(g) + 5O₂(g)

Correct Answer
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According to the following balanced reaction, how many moles of HNO₃ are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C₂H₃O₂) ₃ and LiNO₃ are mixed.

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