Question 1

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 2

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 3

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 4

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.

Question 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

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

Accepted Answer

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

Question 13

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 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

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 16

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 17

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 18

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 19

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 20

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

Exam 4: Chemical Reactions and Stoichiometry

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

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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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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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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When dissolved in water, KOH behaves as

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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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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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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Which of the following compounds is insoluble in water?

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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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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Exam 4: Chemical Reactions and Stoichiometry

Correct AnswerverifiedShow Answer

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

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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?

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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)

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

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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?

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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)

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

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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?

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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)

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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?

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When dissolved in water, KOH behaves as

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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?

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

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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

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Which of the following compounds is insoluble in water?

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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)

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Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

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
verified

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

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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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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Correct Answer
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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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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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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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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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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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