Question 1

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. 
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 2

What volume of a 0.540 mol L-1 NaOH solution contains 11.5 g of NaOH?

Accepted Answer

A) 0.155 L 
B) 0.532 L 
C) 1.88 L 
D) 6.44 L 
A) 0.155 L 
B) 0.532 L 
C) 1.88 L 
D) 6.44 L

Question 3

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

Accepted Answer

A) 0.274 mol L-1 
B) 0.356 mol L-1 
C) 2.81 mol L-1 
D) 3.65 mol L-1 
A) 0.274 mol L-1 
B) 0.356 mol L-1 
C) 2.81 mol L-1 
D) 3.65 mol L-1

Question 4

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 
2C8H18 + 25O2 → 16CO2 + 18H2O

Accepted Answer

A) 20.00% 
B) 25.00% 
C) 50.00% 
D) 12.50% 
A) 20.00% 
B) 25.00% 
C) 50.00% 
D) 12.50%

Question 5

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Al and F2 in the balanced reaction? 
Al(s)+ F2(g)→ Al3+(aq)+ F-(aq)

Accepted Answer

A) Al = 2,F2 = 3 
B) Al = 2,F2 = 6 
C) Al = 1,F2 = 1 
D) Al = 2,F2 = 1 
E) Al = 3,F2 = 2 
A) Al = 2,F2 = 3 
B) Al = 2,F2 = 6 
C) Al = 1,F2 = 1 
D) Al = 2,F2 = 1 
E) Al = 3,F2 = 2

Question 6

What element is being oxidized in the following (unbalanced)redox reaction? Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

Accepted Answer

A) Cr 
B) O 
C) H 
D) Cl 
A) Cr 
B) O 
C) H 
D) Cl

Question 7

Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide.A mixture of these two reactants is 67.2% mole percent Al.Find the theoretical yield (in grams)of manganese from the reaction of 250 g of this mixture.

Accepted Answer

A) 87.3 g 
B) 193 g 
C) 18.13 g 
D) 6.72 g 
E) 96.6 g 
A) 87.3 g 
B) 193 g 
C) 18.13 g 
D) 6.72 g 
E) 96.6 g

Question 8

Lithium and nitrogen react to produce lithium nitride: 
6Li(s)+ $\mathrm { N } _ { 2 }$ (g)? $2 \mathrm { Li } _ { 3 }$ N(s)
How many moles of $\mathrm { N } _ { 2 }$ are needed to react with 0.400 mol of lithium?

Accepted Answer

A) 2.40 
B) 0.400 
C) 0.133 
D) 1.2 
E) 0.0667 
A) 2.40 
B) 0.400 
C) 0.133 
D) 1.2 
E) 0.0667

Question 9

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)+ 3H2(g)→ 2NH3(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. 
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 10

Which of the following describes NaCl?

Accepted Answer

A) weak acid 
B) weak electrolyte 
C) strong acid 
D) strong electrolyte 
E) nonelectrolyte 
A) weak acid 
B) weak electrolyte 
C) strong acid 
D) strong electrolyte 
E) nonelectrolyte

Question 11

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

Accepted Answer

A) K2CO3 + NaCl 
B) Na2SO4 + KOH 
C) CaS + Na2SO4 
D) None of these solution pairs will produce a precipitate. 
E) All of these solution pairs will produce a precipitate. 
A) K2CO3 + NaCl 
B) Na2SO4 + KOH 
C) CaS + Na2SO4 
D) None of these solution pairs will produce a precipitate. 
E) All of these solution pairs will produce a precipitate.

Question 12

How many grams of H2 gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2Al(s)+ 6HCl(aq)→ 2AlCl3(aq)+ 3H2(g)

Accepted Answer

A) 2.68 g 
B) 4.04 g 
C) 6.05 g 
D) 12.1 g 
A) 2.68 g 
B) 4.04 g 
C) 6.05 g 
D) 12.1 g

Question 13

Why is sugar water not a good conductor of current?

Accepted Answer

Sugar wate

Question 14

What element is being oxidized in the following (unbalanced)redox reaction? MnO4- (aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

Accepted Answer

A) C 
B) O 
C) Mn 
D) H 
A) C 
B) O 
C) Mn 
D) H

Question 15

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. 
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.

Question 16

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L-1 solution?

Accepted Answer

A) 58.40 g 
B) 175.3 g 
C) 14.60 g 
D) 43.83 g 
A) 58.40 g 
B) 175.3 g 
C) 14.60 g 
D) 43.83 g

Question 17

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Br2 and OH- in the balanced reaction? 
Br2(l)→ BrO3- (aq)+ Br- (aq)

Accepted Answer

A) Br2 = 1,OH- = 2 
B) Br2 = 2,OH- = 5 
C) Br2 = 3,OH- = 3 
D) Br2 = 3,OH- = 6 
E) Br2 = 1,OH- = 6 
A) Br2 = 1,OH- = 2 
B) Br2 = 2,OH- = 5 
C) Br2 = 3,OH- = 3 
D) Br2 = 3,OH- = 6 
E) Br2 = 1,OH- = 6

Question 18

Which of the following is a precipitation reaction?

Accepted Answer

A) Zn(s)+ 2AgNO3(aq)→ 2Ag(s)+ Zn(NO3)2(aq) 
B) NaCl(aq)+ LiI(aq)→ NaI(aq)+ LiCl(aq) 
C) 2LiI(aq)+ Hg2(NO3)2(aq)→ Hg2I2(s)+ 2LiNO3(aq) 
D) HCl(aq)+ KOH(aq)→ KCl(aq)+ H2O(l) 
E) None of the above are precipitation reactions. 
A) Zn(s)+ 2AgNO3(aq)→ 2Ag(s)+ Zn(NO3)2(aq) 
B) NaCl(aq)+ LiI(aq)→ NaI(aq)+ LiCl(aq) 
C) 2LiI(aq)+ Hg2(NO3)2(aq)→ Hg2I2(s)+ 2LiNO3(aq) 
D) HCl(aq)+ KOH(aq)→ KCl(aq)+ H2O(l) 
E) None of the above are precipitation reactions.

Question 19

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 H2O 
A) 38.0 g H2O 
B) 21.7 g H2O 
C) 43.4 g H2O 
D) 10.9 g H2O 
E) 26.5 g H2O

Question 20

According to the following reaction,what amount of Al2S3 remains when 20.00 g of Al2S3 and 2.00 g of H2O are reacted? A few of the molar masses are as follows: Al2S3 = 150.17 g mol-1,H2O = 18.02 g mol-1. Al2S3(s)+ 6H2O(l)→ 2Al(OH)3(s)+ 3H2S(g)

Accepted Answer

A) 28.33 g 
B) 14.00 g 
C) 8.33 g 
D) 19.78 g 
E) 17.22 g 
A) 28.33 g 
B) 14.00 g 
C) 8.33 g 
D) 19.78 g 
E) 17.22 g

Exam 4: Chemical Reactions and Stoichiometry

When dissolved in water,KOH behaves as

What volume of a 0.540 mol L-1 NaOH solution contains 11.5 g of NaOH?

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Al and F2 in the balanced reaction? Al(s)+ F2(g)→ Al3+(aq)+ F-(aq)

What element is being oxidized in the following (unbalanced)redox reaction? Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide.A mixture of these two reactants is 67.2% mole percent Al.Find the theoretical yield (in grams)of manganese from the reaction of 250 g of this mixture.

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N2\mathrm { N } _ { 2 }N2​ (g)? 2Li32 \mathrm { Li } _ { 3 }2Li3​ N(s) How many moles of N2\mathrm { N } _ { 2 }N2​ are needed to react with 0.400 mol of lithium?

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)+ 3H2(g)→ 2NH3(g)

Which of the following describes NaCl?

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

How many grams of H2 gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2Al(s)+ 6HCl(aq)→ 2AlCl3(aq)+ 3H2(g)

Why is sugar water not a good conductor of current?

What element is being oxidized in the following (unbalanced)redox reaction? MnO4- (aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

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

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L-1 solution?

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Br2 and OH- in the balanced reaction? Br2(l)→ BrO3- (aq)+ Br- (aq)

Which of the following is a precipitation reaction?

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)

According to the following reaction,what amount of Al2S3 remains when 20.00 g of Al2S3 and 2.00 g of H2O are reacted? A few of the molar masses are as follows: Al2S3 = 150.17 g mol-1,H2O = 18.02 g mol-1. Al2S3(s)+ 6H2O(l)→ 2Al(OH)3(s)+ 3H2S(g)

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Filters

What volume of a 0.540 mol L^-1 NaOH solution contains 11.5 g of NaOH?

Identify the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Aland F₂ in the balanced reaction? Al(s)+ F₂(g)→ Al³⁺(aq)+ F^-(aq)

What element is being oxidized in the following (unbalanced)redox reaction? Cr(OH)₄^- (aq)+ ClO^- (aq)→ CrO₄²^- (aq)+ Cl^- (aq)

Metallic aluminum reacts with MnO₂ at elevated temperatures to form manganese metal and aluminum oxide.A mixture of these two reactants is 67.2% mole percent Al.Find the theoretical yield (in grams)of manganese from the reaction of 250 g of this mixture.

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ $\mathrm { N } _ { 2 }$ (g)? $2 \mathrm { Li } _ { 3 }$ N(s) How many moles of $\mathrm { N } _ { 2 }$ are needed to react with 0.400 mol of lithium?

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)+ 3H₂(g)→ 2NH₃(g)

How many grams of H₂ gas can be produced by the reaction of 54.0 grams of Al(s)with an excess of dilute hydrochloric acid in the reaction shown below? 2Al(s)+ 6HCl(aq)→ 2AlCl₃(aq)+ 3H₂(g)

What element is being oxidized in the following (unbalanced)redox reaction? MnO₄^- (aq)+ H₂C₂O₄(aq)→ Mn²⁺(aq)+ CO₂(g)

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L^-1 solution?

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Br₂and OH^- in the balanced reaction? Br₂(l)→ BrO₃^- (aq)+ Br^- (aq)

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)

According to the following reaction,what amount of Al₂S₃ remains when 20.00 g of Al₂S₃ and 2.00 g of H₂O are reacted? A few of the molar masses are as follows: Al₂S₃= 150.17 g mol^-1,H₂O = 18.02 g mol^-1. Al₂S₃(s)+ 6H₂O(l)→ 2Al(OH)₃(s)+ 3H₂S(g)