Question 1

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L-1 LiI solution?

Accepted Answer

A)  1.31 × 10-3 mol
B)  8.74 × 10-3 mol
C)  1.14 × 10-3 mol
D)  3.67 × 10-3 mol
E)  7.65 × 10-3 mol

Question 2

What precipitate is most likely formed from a solution containing Ba+2, Na+1, OH-1, and CO3-2.

Accepted Answer

A)  NaOH
B)  BaCO3
C)  Na2CO3
D)  Ba(OH) 2

Question 3

Two samples of potassium iodide are decomposed into their constituent elements. The first sample produced 13.0 g of potassium and 42.3 g of iodine. If the second sample produced 24.4 kg of potassium, how many kilograms of iodine were produced?

Accepted Answer

A)  13.3 kg
B)  22.5 kg
C)  79.4 kg
D)  44.4 kg
E)  92.4 kg

Question 4

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.

Question 5

How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s) + 2H2O(l) → 4KOH(s) + O2(g)

Accepted Answer

A)  19.9 g O2
B)  27.9 g O2
C)  49.7 g O2
D)  3.59 g O2
E)  11.7 g O2

Question 6

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

Accepted Answer

A)  -2
B)  +2
C)  +4
D)  +6

Question 7

Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 10.0 g of Fe2O3. ________ MgO(s) + ________ Fe(s) → ________ Fe2O3(s) + ________ Mg(s)

Accepted Answer

A)  0.312 g
B)  0.841 g
C)  2.52 g
D)  7.57 g

Question 8

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-1

Question 9

What is the concentration of FeCl3 in a solution prepared by dissolving 20.0 g of FeCl3 in enough water to make 275 mL of solution?

Accepted Answer

A)  4.48 × 10-4 mol L-1
B)  0.448 mol L-1
C)  2.23 mol L-1
D)  2.23 × 103 mol L-1

Question 10

Two samples of calcium fluoride are decomposed into their constituent elements. The first sample produced 0.154 g of calcium and 0.146 g of fluorine. If the second sample produced 294 mg of fluorine, how many grams of calcium were formed?

Accepted Answer

A)  0.280 g
B)  3.09 × 102 g
C)  3.13 g
D)  0.309 g
E)  2.80 × 102 g

Question 11

What is the concentration of nitrate ions in a 0.125 mol L-1 Mg(NO3) 2 solution?

Accepted Answer

A)  0.125 mol L-1
B)  0.0625 mol L-1
C)  0.375 mol L-1
D)  0.250 mol L-1
E)  0.160 mol L-1

Question 12

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li s) + N2(g) → 2Li3N(s) 
In a particular experiment, 3.50 g samples of each reagent are reacted. What is the theoretical yield of lithium nitride?

Accepted Answer

A)  3.52 g
B)  2.93 g
C)  17.6 g
D)  5.85 g
E)  8.7 g

Question 13

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2KCl(aq) + CaCO3(aq)

Accepted Answer

A)  0.896 g
B)  1.12 g
C)  2.23 g
D)  4.47 g

Question 14

Which of the following compounds is insoluble in water?

Accepted Answer

A)  Hg2I2
B)  MgSO4
C)  (NH4) 2CO3
D)  BaS
E)  All of these compounds are soluble in water.

Question 15

Carbonic acid can form water and carbon dioxide upon heating. How much carbon dioxide is formed from 6.20 g of carbonic acid? H2CO3 → H2O + CO2

Accepted Answer

A)  4.40 g
B)  8.80 g
C)  2.20 g
D)  6.20 g

Question 16

What are the required coefficients to properly balance the following chemical reaction? 
NO(g) + H2O(g) → NH3(g) + O2(g)

Accepted Answer

A)  4, 6, 4, 2O(g) → NH3(g) + O2(g)  
A)  4, 6, 4,   
B)  4, 6, 4, 5 
C)  2, 3, 2, 2 
D)  2, 3, 2, 3 
E)  4, 4, 6, 6" class="answers-bank-image d-inline" rel="preload" >
B)  4, 6, 4, 5
C)  2, 3, 2, 2
D)  2, 3, 2, 3
E)  4, 4, 6, 6

Question 17

According to the following reaction, what mass of PbCl2 can form from 235 mL of a 0.110 mol L-1 KCl solution? Assume that there is excess Pb(NO3) 2. 2KCl(aq) + Pb(NO3) 2(aq) → PbCl2(s) + 2KNO3(aq)

Accepted Answer

A)  7.19 g
B)  3.59 g
C)  1.80 g
D)  5.94 g
E)  1.30 g

Question 18

Based on the balanced chemical equation shown below, determine the mass percent of Fe3+ in a 0.7450 g sample of iron ore if 22.40 mL of a 0.1000 mol L-1 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 2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) + Sn4+(aq)

Accepted Answer

A)  5.365%
B)  8.396%
C)  16.79%
D)  33.58%

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 0.250 mol L-1 potassium bromate, KBrO3(aq) , solution. The chemical equation for the reaction is 6Fe2+(aq) + BrO3-(aq) + 6H+(aq) → 6Fe3+(aq) + Br-(aq) + 3H2O(l)

Accepted Answer

A)  0.0312 mol L-1
B)  0.188 mol L-1
C)  1.12 mol L-1
D)  2.00 mol L-1

Question 20

When dissolved in water, KOH behaves as

Accepted Answer

A)  an acid that forms K+ and OH- ions.
B)  an acid that forms KO- and H+ ions.
C)  a base that forms K+ and OH- ions.
D)  a base that forms KO- and H+ ions.

Exam 4: Chemical Reactions and Stoichiometry

Carbonic acid can form water and carbon dioxide upon heating. How much carbon dioxide is formed from 6.20 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Correct Answer
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Two samples of calcium fluoride are decomposed into their constituent elements. The first sample produced 0.154 g of calcium and 0.146 g of fluorine. If the second sample produced 294 mg of fluorine, how many grams of calcium were formed?

Correct Answer
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Which of the following compounds is insoluble in water?

Correct Answer
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What are the required coefficients to properly balance the following chemical reaction? NO(g) + H₂O(g) → NH₃(g) + O₂(g)

Correct Answer
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When dissolved in water, KOH behaves as

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

Correct Answer
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Two samples of potassium iodide are decomposed into their constituent elements. The first sample produced 13.0 g of potassium and 42.3 g of iodine. If the second sample produced 24.4 kg of potassium, how many kilograms of iodine were produced?

Correct Answer
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What precipitate is most likely formed from a solution containing Ba⁺², Na⁺¹, OH^-1, and CO₃^-2.

Correct Answer
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How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L^-1 LiI solution?

Correct Answer
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According to the following reaction, what mass of PbCl₂ can form from 235 mL of a 0.110 mol L^-1 KCl solution? Assume that there is excess Pb(NO₃) ₂. 2KCl(aq) + Pb(NO₃) ₂(aq) → PbCl₂(s) + 2KNO₃(aq)

Correct Answer
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Correct Answer
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How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2KCl(aq) + CaCO₃(aq)

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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Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li s) + N₂(g) → 2Li₃N(s) In a particular experiment, 3.50 g samples of each reagent are reacted. What is the theoretical yield of lithium nitride?

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

Correct Answer
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What is the concentration of nitrate ions in a 0.125 mol L^-1 Mg(NO₃) ₂ solution?

Correct Answer
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What is the concentration of FeCl₃ in a solution prepared by dissolving 20.0 g of FeCl₃ in enough water to make 275 mL of solution?

Correct Answer
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Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 10.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

Correct Answer
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How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s) + 2H₂O(l) → 4KOH(s) + O₂(g)

Correct Answer
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Exam 4: Chemical Reactions and Stoichiometry

Carbonic acid can form water and carbon dioxide upon heating. How much carbon dioxide is formed from 6.20 g of carbonic acid? H2CO3 → H2O + CO2

Correct AnswerverifiedShow Answer

Two samples of calcium fluoride are decomposed into their constituent elements. The first sample produced 0.154 g of calcium and 0.146 g of fluorine. If the second sample produced 294 mg of fluorine, how many grams of calcium were formed?

Correct AnswerverifiedShow Answer

Which of the following compounds is insoluble in water?

Correct AnswerverifiedShow Answer

What are the required coefficients to properly balance the following chemical reaction? NO(g) + H2O(g) → NH3(g) + O2(g)

Correct AnswerverifiedShow Answer

When dissolved in water, KOH behaves as

Correct AnswerverifiedShow Answer

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

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Two samples of potassium iodide are decomposed into their constituent elements. The first sample produced 13.0 g of potassium and 42.3 g of iodine. If the second sample produced 24.4 kg of potassium, how many kilograms of iodine were produced?

Correct AnswerverifiedShow Answer

What precipitate is most likely formed from a solution containing Ba+2, Na+1, OH-1, and CO3-2.

Correct AnswerverifiedShow Answer

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L-1 LiI solution?

Correct AnswerverifiedShow Answer

According to the following reaction, what mass of PbCl2 can form from 235 mL of a 0.110 mol L-1 KCl solution? Assume that there is excess Pb(NO3) 2. 2KCl(aq) + Pb(NO3) 2(aq) → PbCl2(s) + 2KNO3(aq)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2KCl(aq) + CaCO3(aq)

Correct AnswerverifiedShow Answer

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

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li s) + N2(g) → 2Li3N(s) In a particular experiment, 3.50 g samples of each reagent are reacted. What is the theoretical yield of lithium nitride?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the concentration of nitrate ions in a 0.125 mol L-1 Mg(NO3) 2 solution?

Correct AnswerverifiedShow Answer

What is the concentration of FeCl3 in a solution prepared by dissolving 20.0 g of FeCl3 in enough water to make 275 mL of solution?

Correct AnswerverifiedShow Answer

Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 10.0 g of Fe2O3. ________ MgO(s) + ________ Fe(s) → ________ Fe2O3(s) + ________ Mg(s)

Correct AnswerverifiedShow Answer

How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s) + 2H2O(l) → 4KOH(s) + O2(g)

Correct AnswerverifiedShow Answer

Carbonic acid can form water and carbon dioxide upon heating. How much carbon dioxide is formed from 6.20 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Correct Answer
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Correct Answer
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Correct Answer
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What are the required coefficients to properly balance the following chemical reaction? NO(g) + H₂O(g) → NH₃(g) + O₂(g)

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

Correct Answer
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Correct Answer
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What precipitate is most likely formed from a solution containing Ba⁺², Na⁺¹, OH^-1, and CO₃^-2.

Correct Answer
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How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L^-1 LiI solution?

Correct Answer
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According to the following reaction, what mass of PbCl₂ can form from 235 mL of a 0.110 mol L^-1 KCl solution? Assume that there is excess Pb(NO₃) ₂. 2KCl(aq) + Pb(NO₃) ₂(aq) → PbCl₂(s) + 2KNO₃(aq)

Correct Answer
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Correct Answer
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How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2KCl(aq) + CaCO₃(aq)

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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Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li s) + N₂(g) → 2Li₃N(s) In a particular experiment, 3.50 g samples of each reagent are reacted. What is the theoretical yield of lithium nitride?

Correct Answer
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Correct Answer
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Correct Answer
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What is the concentration of nitrate ions in a 0.125 mol L^-1 Mg(NO₃) ₂ solution?

Correct Answer
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What is the concentration of FeCl₃ in a solution prepared by dissolving 20.0 g of FeCl₃ in enough water to make 275 mL of solution?

Correct Answer
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Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 10.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

Correct Answer
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How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s) + 2H₂O(l) → 4KOH(s) + O₂(g)

Correct Answer
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