Question 1

Which of the following describes HCl?

Accepted Answer

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

Question 2

Determine the theoretical yield of H2S (in moles)if 4.0 mol Al2S3 and 4.0 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is 
Al2S3 = 150.17 g mol-1. Al2S3(s)+ 6H2O(l)→ 2Al(OH)3(s)+ 3H2S(g)

Accepted Answer

A) 12 mol H2S 
B) 4.0 mol H2S 
C) 18 mol H2S 
D) 6.0 mol H2S 
E) 2.0 mol H2S 
A) 12 mol H2S 
B) 4.0 mol H2S 
C) 18 mol H2S 
D) 6.0 mol H2S 
E) 2.0 mol H2S

Question 3

How many moles of Co2+ are present in 0.150 L of a 0.200 mol L-1 solution of CoI2?

Accepted Answer

Question 4

H Br ,HI ,H NO3,Na Br ,and KNO3 are all classified as

Accepted Answer

A) acids. 
B) nonelectrolytes. 
C) strong electrolytes. 
D) weak electrolytes. 
A) acids. 
B) nonelectrolytes. 
C) strong electrolytes. 
D) weak electrolytes.

Question 5

A stock solution of $\mathrm { HNO } _ { 3 }$ is prepared and found to contain 13.7 mol L-1 of $\mathrm { HNO } _ { 3 }$ .If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,what is the concentration of the diluted solution?

Accepted Answer

A) 1.46 mol L-1 
B) 274 mol L-1 
C) 0.274 mol L-1 
D) 685 mol L-1 
E) 0.685 mol L-1 
A) 1.46 mol L-1 
B) 274 mol L-1 
C) 0.274 mol L-1 
D) 685 mol L-1 
E) 0.685 mol L-1

Question 6

What precipitate is most likely formed from a solution containing Ba2+,Na1+,OH1-,and CO32-.

Accepted Answer

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

Question 7

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

Question 8

How many of the following compounds are insoluble in water? 
KC2H3O2 CaSO4 SrS AlPO4

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 9

A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3).If it is the only product,what mass of PCl3 is formed?

Accepted Answer

A) 30.15 g 
B) 54.93 g 
C) 140.01 g 
D) 79.71 g 
E) 91.86 g 
A) 30.15 g 
B) 54.93 g 
C) 140.01 g 
D) 79.71 g 
E) 91.86 g

Question 10

Which of the following is an oxidation-reduction reaction?

Accepted Answer

A) HCl(aq)+ LiOH(aq)→ LiCl(aq)+ H2O(l) 
B) NaI(aq)+ AgNO3(aq)→ AgI(s)+ NaNO3(aq) 
C) Pb(C2H3O2)2(aq)+ 2NaCl(aq)→ PbCl2(s)+ 2NaC2H3O2(aq) 
D) Mg(s)+ 2HCl(aq)→ MgCl2(aq)+ H2(g) 
E) All of the above are oxidation-reduction reactions. 
A) HCl(aq)+ LiOH(aq)→ LiCl(aq)+ H2O(l) 
B) NaI(aq)+ AgNO3(aq)→ AgI(s)+ NaNO3(aq) 
C) Pb(C2H3O2)2(aq)+ 2NaCl(aq)→ PbCl2(s)+ 2NaC2H3O2(aq) 
D) Mg(s)+ 2HCl(aq)→ MgCl2(aq)+ H2(g) 
E) All of the above are oxidation-reduction reactions.

Question 11

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: 
CaO(s)+ $\mathrm { H } _ { 2 }$ O(l)? $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ (s)
In a particular experiment,5.00 g sample of CaO is reacted with excess water and 6.11 g of $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ is recovered.What is the percent yield in this experiment?

Accepted Answer

A) 81.8 
B) 1.22 
C) 108 
D) 122 
E) 92.5 
A) 81.8 
B) 1.22 
C) 108 
D) 122 
E) 92.5

Question 12

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3).If ammonia is the only product,what mass of ammonia is formed?

Accepted Answer

A) 17.03 g 
B) 1.10 g 
C) 14.01 g 
D) 3.02 g 
E) 23.07 g 
A) 17.03 g 
B) 1.10 g 
C) 14.01 g 
D) 3.02 g 
E) 23.07 g

Question 13

What is the concentration (M)of sodium ions in 4.57 L of a 1.25 mol L-1 $\mathrm { Na } _ { 3 }$ P solution?

Accepted Answer

Question 14

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 15

Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g mol-1. BCl3(g)+ 3H2O(l)→ H3BO3(s)+ 3HCl(g)

Accepted Answer

A) 75.9 g HCl 
B) 132 g HCl 
C) 187 g HCl 
D) 56.0 g HCl 
E) 25.3 g HCl 
A) 75.9 g HCl 
B) 132 g HCl 
C) 187 g HCl 
D) 56.0 g HCl 
E) 25.3 g HCl

Question 16

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 
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 17

What element is being oxidized in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2- (aq)+ O2(g)

Accepted Answer

A) H 
B) O 
C) Cl 
D) N 
E) C 
A) H 
B) O 
C) Cl 
D) N 
E) C

Question 18

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

Accepted Answer

Question 19

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2? 
2KClO3(s)→ 2KCl(s)+ 3O2(g)

Accepted Answer

A) 53.1 g 
B) 81.7 g 
C) 126 g 
D) 283 g 
A) 53.1 g 
B) 81.7 g 
C) 126 g 
D) 283 g

Question 20

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 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%

Exam 4: Chemical Reactions and Stoichiometry

Which of the following describes HCl?

Determine the theoretical yield of H2S (in moles)if 4.0 mol Al2S3 and 4.0 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g mol-1. Al2S3(s)+ 6H2O(l)→ 2Al(OH)3(s)+ 3H2S(g)

How many moles of Co2+ are present in 0.150 L of a 0.200 mol L-1 solution of CoI2?

H Br ,HI ,H NO3,Na Br ,and KNO3 are all classified as

A stock solution of HNO3\mathrm { HNO } _ { 3 }HNO3​ is prepared and found to contain 13.7 mol L-1 of HNO3\mathrm { HNO } _ { 3 }HNO3​ .If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,what is the concentration of the diluted solution?

What precipitate is most likely formed from a solution containing Ba2+,Na1+,OH1-,and CO32-.

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)

How many of the following compounds are insoluble in water? KC2H3O2 CaSO4 SrS AlPO4

A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3).If it is the only product,what mass of PCl3 is formed?

Which of the following is an oxidation-reduction reaction?

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3).If ammonia is the only product,what mass of ammonia is formed?

What is the concentration (M)of sodium ions in 4.57 L of a 1.25 mol L-1 Na3\mathrm { Na } _ { 3 }Na3​ P solution?

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?

Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g mol-1. BCl3(g)+ 3H2O(l)→ H3BO3(s)+ 3HCl(g)

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?

What element is being oxidized in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2- (aq)+ O2(g)

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2? 2KClO3(s)→ 2KCl(s)+ 3O2(g)

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Determine the theoretical yield of H₂S (in moles)if 4.0 mol Al₂S₃ and 4.0 mol H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is Al₂S₃= 150.17 g mol^-1. Al₂S₃(s)+ 6H₂O(l)→ 2Al(OH)₃(s)+ 3H₂S(g)

How many moles of Co²⁺ are present in 0.150 L of a 0.200 mol L^-1 solution of CoI₂?

HBr,HI,HNO₃,NaBr,and KNO₃ are all classified as

A stock solution of $\mathrm { HNO } _ { 3 }$ is prepared and found to contain 13.7 mol L^-1 of $\mathrm { HNO } _ { 3 }$ .If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,what is the concentration of the diluted solution?

What precipitate is most likely formed from a solution containing Ba²⁺,Na¹⁺,OH^1-,and CO₃^2-.

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)

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ SrS AlPO₄

A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl₃).If it is the only product,what mass of PCl₃ is formed?

A 14.01 g sample of N₂ reacts with 3.02 g of H₂ to form ammonia (NH₃).If ammonia is the only product,what mass of ammonia is formed?

What is the concentration (M)of sodium ions in 4.57 L of a 1.25 mol L^-1 $\mathrm { Na } _ { 3 }$ P solution?

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?

Determine the theoretical yield of HCl if 60.0 g of BCl₃and 37.5 g of H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl₃ = 117.16 g mol^-1. BCl₃(g)+ 3H₂O(l)→ H₃BO₃(s)+ 3HCl(g)

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?

What element is being oxidized in the following (unbalanced)redox reaction? H₂O₂(l)+ ClO₂(aq)→ ClO₂^- (aq)+ O₂(g)

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L^-1 NaOH solution?

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2KClO₃(s)→ 2KCl(s)+ 3O₂(g)

Identify the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2C₈H₁₈ + 25O₂→ 16CO₂ + 18H₂O