Question 1

Balance the following equation:
________ C9H20 + ________ O2 → ________ H2O + ________ CO2

Accepted Answer

C₉H₂₀ + 14O₂→

Question 2

What are the required coefficients to properly balance the following chemical reaction? MnCl2(s)+ H2O(l)+ Cl2(g)→ HCl(aq)+ MnO2(s)

Accepted Answer

A) 1,2,1,4,1 
B) 2,2,1,4,2 
C) 1,1,1,2,1 
D) 1,1,1,4,1 
E) 2,1,1,4,2 
A) 1,2,1,4,1 
B) 2,2,1,4,2 
C) 1,1,1,2,1 
D) 1,1,1,4,1 
E) 2,1,1,4,2

Question 3

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

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. 
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

If the density of ethanol,C2H5OH,is 0.789 g mL-1.How many millilitres of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation? 
C2H5OH(l)+ 3O2(g)→ 2CO2(g)+ 3H2O(l)

Accepted Answer

A) 6.19 mL 
B) 9.95 mL 
C) 19.9 mL 
D) 839.8 mL 
A) 6.19 mL 
B) 9.95 mL 
C) 19.9 mL 
D) 839.8 mL

Question 6

Which of the following compounds is soluble in water?

Accepted Answer

A) CaCl2 
B) MgCO3 
C) PbCl2 
D) BaSO4 
E) None of these compounds is soluble in water. 
A) CaCl2 
B) MgCO3 
C) PbCl2 
D) BaSO4 
E) None of these compounds is soluble in water.

Question 7

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

Accepted Answer

A) +1 
B) +2 
C) 0 
D) -1 
E) -2 
A) +1 
B) +2 
C) 0 
D) -1 
E) -2

Question 8

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

Accepted Answer

A) 1,1, $\frac { 1 } { 2 }$ 
B) 1,1,1 
C) 1,1,2 
D) 2,1,1 
E) 2,1,2 
A) 1,1, $\frac { 1 } { 2 }$ 
B) 1,1,1 
C) 1,1,2 
D) 2,1,1 
E) 2,1,2

Question 9

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

Accepted Answer

A) +1 
B) +2 
C) 0 
D) -1 
E) -2 
A) +1 
B) +2 
C) 0 
D) -1 
E) -2

Question 10

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction: Fe2O3(s)+ 2Al(s)→ Al2O3(s)+ 2Fe(s)

Accepted Answer

A) 61.03% 
B) 28.65% 
C) 57.30% 
D) 20.02% 
E) 81.93% 
A) 61.03% 
B) 28.65% 
C) 57.30% 
D) 20.02% 
E) 81.93%

Question 11

How many moles of oxygen 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 O2 
B) 0.580 mol O2 
C) 18.5 mol O2 
D) 0.724 mol O2 
E) 1.73 mol O2 
A) 0.290 mol O2 
B) 0.580 mol O2 
C) 18.5 mol O2 
D) 0.724 mol O2 
E) 1.73 mol O2

Question 12

Which pair of compounds is soluble in water?

Accepted Answer

A) HgBr2 and Hg2I2 
B) CuS and Na2S 
C) LiI and Ca(NO3)2 
D) K NO3 and CaCO3 
A) HgBr2 and Hg2I2 
B) CuS and Na2S 
C) LiI and Ca(NO3)2 
D) K NO3 and CaCO3

Question 13

Which of the following statements is TRUE?

Accepted Answer

A) A reduction process corresponds to an increase in oxidation state as a result of loss of electrons. 
B) An oxidation process involves the loss of electrons resulting in an increase in oxidation state. 
C) An oxidation process corresponds to a decrease in oxidation state as a result of a gain of electrons. 
D) During a reduction process electrons are lost,while during an oxidation they are gained. 
E) During a reduction process an oxidation state increases,while in an oxidation process an oxidation state decreases. 
A) A reduction process corresponds to an increase in oxidation state as a result of loss of electrons. 
B) An oxidation process involves the loss of electrons resulting in an increase in oxidation state. 
C) An oxidation process corresponds to a decrease in oxidation state as a result of a gain of electrons. 
D) During a reduction process electrons are lost,while during an oxidation they are gained. 
E) During a reduction process an oxidation state increases,while in an oxidation process an oxidation state decreases.

Question 14

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

Accepted Answer

A) 2H+(aq)+ CO32-(aq)→ H2CO3(s) 
B) 2Na+(aq)+ CO32-(aq)+ 2H+(aq)+ 2Cl-(aq)→ H2CO3(s)+ 2NaCl(aq) 
C) 2H+(aq)+ CO32-(aq)→ H2O(l)+ CO2(g) 
D) 2Na+(aq)+ CO32-(aq)+ 2H+(aq)+ 2Cl-(aq)→ H2CO3(s)+ 2Na+(aq)+ 2Cl-(aq) 
E) No reaction occurs. 
A) 2H+(aq)+ CO32-(aq)→ H2CO3(s) 
B) 2Na+(aq)+ CO32-(aq)+ 2H+(aq)+ 2Cl-(aq)→ H2CO3(s)+ 2NaCl(aq) 
C) 2H+(aq)+ CO32-(aq)→ H2O(l)+ CO2(g) 
D) 2Na+(aq)+ CO32-(aq)+ 2H+(aq)+ 2Cl-(aq)→ H2CO3(s)+ 2Na+(aq)+ 2Cl-(aq) 
E) No reaction occurs.

Question 15

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K3PO4 in enough water to make 350.mL of solution?

Accepted Answer

A) 0.0101 mol L-1 
B) 0.0404 mol L-1 
C) 0.162 mol L-1 
D) 0.323 mol L-1 
A) 0.0101 mol L-1 
B) 0.0404 mol L-1 
C) 0.162 mol L-1 
D) 0.323 mol L-1

Question 16

Which one of the following compounds is soluble in water?

Accepted Answer

A) Cu3(PO4)2 
B) CoS 
C) Pb(NO3)2 
D) ZnCO3 
A) Cu3(PO4)2 
B) CoS 
C) Pb(NO3)2 
D) ZnCO3

Question 17

Determine the limiting reactant (LR)and the mass (in g)of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g mol-1,N2H4 = 32.05 g mol-1. N2O4(l)+ 2N2H4(l)→ 3N2(g)+ 4H2O(g)

Accepted Answer

A) LR = N2H4,59.0 g N2 formed 
B) LR = N2O4,105 g N2 formed 
C) LR = N2O4,45.7 g N2 formed 
D) LR = N2H4,13.3 g N2 formed 
E) No LR,45.0 g N2 formed 
A) LR = N2H4,59.0 g N2 formed 
B) LR = N2O4,105 g N2 formed 
C) LR = N2O4,45.7 g N2 formed 
D) LR = N2H4,13.3 g N2 formed 
E) No LR,45.0 g N2 formed

Question 18

How many millilitres of 0.550 mol L-1 hydriodic acid are needed to react with 15.00 mL of 0.217 mol L-1 CsOH? 
HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

Accepted Answer

A) 0.0263 mL 
B) 0.169 mL 
C) 5.92 mL 
D) 38.0 mL 
A) 0.0263 mL 
B) 0.169 mL 
C) 5.92 mL 
D) 38.0 mL

Question 19

Determine the concentration of a solution prepared by diluting 25.0 mL of a stock 0.188 mol L-1 Ca(NO3)2 solution to 150.0 mL.

Accepted Answer

A) 1.13 mol L-1 
B) 0.0887 mol L-1 
C) 0.0313 mol L-1 
D) 0.0199 mol L-1 
E) 0.0501 mol L-1 
A) 1.13 mol L-1 
B) 0.0887 mol L-1 
C) 0.0313 mol L-1 
D) 0.0199 mol L-1 
E) 0.0501 mol L-1

Question 20

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of H+ and Fe3+ in the balanced reaction? 
Fe2+(aq)+ MnO4- (aq)→ Fe3+(aq)+ Mn2+(aq)

Accepted Answer

A) H+ = 2,Fe3+ = 3 
B) H+ = 8,Fe3+ = 5 
C) H+ = 3,Fe3+ = 2 
D) H+ = 5,Fe3+ = 1 
E) H+ = 8,Fe3+ = 1 
A) H+ = 2,Fe3+ = 3 
B) H+ = 8,Fe3+ = 5 
C) H+ = 3,Fe3+ = 2 
D) H+ = 5,Fe3+ = 1 
E) H+ = 8,Fe3+ = 1

Exam 4: Chemical Reactions and Stoichiometry

Balance the following equation: ________ C9H20 + ________ O2 → ________ H2O + ________ CO2

What are the required coefficients to properly balance the following chemical reaction? MnCl2(s)+ H2O(l)+ Cl2(g)→ HCl(aq)+ MnO2(s)

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)

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

If the density of ethanol,C2H5OH,is 0.789 g mL-1.How many millilitres of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation? C2H5OH(l)+ 3O2(g)→ 2CO2(g)+ 3H2O(l)

Which of the following compounds is soluble in water?

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

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

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

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction: Fe2O3(s)+ 2Al(s)→ Al2O3(s)+ 2Fe(s)

How many moles of oxygen 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)

Which pair of compounds is soluble in water?

Which of the following statements is TRUE?

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K3PO4 in enough water to make 350.mL of solution?

Which one of the following compounds is soluble in water?

Determine the limiting reactant (LR)and the mass (in g)of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g mol-1,N2H4 = 32.05 g mol-1. N2O4(l)+ 2N2H4(l)→ 3N2(g)+ 4H2O(g)

How many millilitres of 0.550 mol L-1 hydriodic acid are needed to react with 15.00 mL of 0.217 mol L-1 CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

Determine the concentration of a solution prepared by diluting 25.0 mL of a stock 0.188 mol L-1 Ca(NO3)2 solution to 150.0 mL.

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of H+ and Fe3+ in the balanced reaction? Fe2+(aq)+ MnO4- (aq)→ Fe3+(aq)+ Mn2+(aq)

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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

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Filters

Balance the following equation: C₉H₂₀ + O₂→ H₂O + CO₂

What are the required coefficients to properly balance the following chemical reaction? MnCl₂(s)+ H₂O(l)+ Cl₂(g)→ HCl(aq)+ MnO₂(s)

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)

If the density of ethanol,C₂H₅OH,is 0.789 g mL^-1.How many millilitres of ethanol are needed to produce 15.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l)+ 3O₂(g)→ 2CO₂(g)+ 3H₂O(l)

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

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

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

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction: Fe₂O₃(s)+ 2Al(s)→ Al₂O₃(s)+ 2Fe(s)

How many moles of oxygen 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)

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

If the reaction of phosphate ion with water is ignored,what is the total concentration of ions in a solution prepared by dissolving 3.00 g of K₃PO₄ in enough water to make 350.mL of solution?

Determine the limiting reactant (LR)and the mass (in g)of nitrogen that can be formed from 50.0 g N₂O₄ and 45.0 g N₂H₄.Some possibly useful molar masses are as follows: N₂O₄ = 92.02 g mol^-1,N₂H₄ = 32.05 g mol^-1. N₂O₄(l)+ 2N₂H₄(l)→ 3N₂(g)+ 4H₂O(g)

How many millilitres of 0.550 mol L^-1 hydriodic acid are needed to react with 15.00 mL of 0.217 mol L^-1 CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H₂O(l)

Determine the concentration of a solution prepared by diluting 25.0 mL of a stock 0.188 mol L^-1 Ca(NO₃)₂ solution to 150.0 mL.

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of H⁺and Fe³⁺ in the balanced reaction? Fe²⁺(aq)+ MnO₄^- (aq)→ Fe³⁺(aq)+ Mn²⁺(aq)