Question 1

How many moles of hydrogen atoms are there in 2.50 mol of C6H12O6?

Accepted Answer

A)  2.50 
B)  30.0 
C)  1.51 × 1024 
D)  1.81 × 1025 
A)  2.50 
B)  30.0 
C)  1.51 × 1024 
D)  1.81 × 1025

Question 2

Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ___ C6H14(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

Accepted Answer

A)  1, 1, 1, 1 
B)  1, 3, 6, 7 
C)  1, 9.5, 6, 7 
D)  2, 19, 12, 14 
A)  1, 1, 1, 1 
B)  1, 3, 6, 7 
C)  1, 9.5, 6, 7 
D)  2, 19, 12, 14

Question 3

Which of the following is true of a chemical reaction?

Accepted Answer

A)  In a chemical reaction, the number of moles of product always equals the number of moles of reactants. 
B)  In a chemical reaction, the mass of the products always equals the mass of the starting materials that have reacted. 
C)  Both a and b are true. 
D)  Both a and b are false. 
A)  In a chemical reaction, the number of moles of product always equals the number of moles of reactants. 
B)  In a chemical reaction, the mass of the products always equals the mass of the starting materials that have reacted. 
C)  Both a and b are true. 
D)  Both a and b are false.

Question 4

When a solution of Cu(II) chloride, CuCl2 , is added to a solution of potassium sulfide, K2S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the total ionic equation for this reaction?

Accepted Answer

A)  CuCl2(aq) + K2S(aq) → CuS(s) + 2 KCl(aq) 
B)  Cu2+(aq) + Cl22-(aq) + K22+(aq) + S2-(aq) → CuS(s) + K22+(aq) + Cl22-(aq) 
C)  Cu2+(aq) + 2 Cl-(aq) + 2 K+(aq) + S2-(aq) → CuS(s) + 2 K+(aq) + 2 Cl- (aq) 
D)  Cu2+(aq) + S2-(aq) → CuS(s) 
A)  CuCl2(aq) + K2S(aq) → CuS(s) + 2 KCl(aq) 
B)  Cu2+(aq) + Cl22-(aq) + K22+(aq) + S2-(aq) → CuS(s) + K22+(aq) + Cl22-(aq) 
C)  Cu2+(aq) + 2 Cl-(aq) + 2 K+(aq) + S2-(aq) → CuS(s) + 2 K+(aq) + 2 Cl- (aq) 
D)  Cu2+(aq) + S2-(aq) → CuS(s)

Question 5

What is the molecular weight of ibuprofen, C13H18O2?

Accepted Answer

A)  29.0 amu 
B)  206.3 amu 
C)  289.4 amu 
D)  377.7 amu 
A)  29.0 amu 
B)  206.3 amu 
C)  289.4 amu 
D)  377.7 amu

Question 6

How many moles of oxygen atoms are present in 5.20 mol of Al2(SO4)3?

Accepted Answer

A)  15.6 
B)  20.8 
C)  62.4 
D)  3.76 × 1025 
A)  15.6 
B)  20.8 
C)  62.4 
D)  3.76 × 1025

Question 7

Of the following anions, which almost always forms soluble compounds?

Accepted Answer

A)  I- 
B)  PO42- 
C)  S2- 
D)  all of these 
A)  I- 
B)  PO42- 
C)  S2- 
D)  all of these

Question 8

When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the total ionic equation for this reaction?

Accepted Answer

A)  2 NH4Cl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 NH4NO3(aq) 
B)  2 NH4+(aq) + 2 Cl-(aq) + Pb2+(aq) + 2 NO3-(aq)
→ PbCl2(s) + 2 NH4+(aq) + 2 NO3-(aq) 
C)  Pb2+(aq) + 2 Cl-(aq) → PbCl2(s) 
D)  Pb2+(aq) + Cl22-(aq) → PbCl2(s) 
A)  2 NH4Cl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 NH4NO3(aq) 
B)  2 NH4+(aq) + 2 Cl-(aq) + Pb2+(aq) + 2 NO3-(aq)
→ PbCl2(s) + 2 NH4+(aq) + 2 NO3-(aq) 
C)  Pb2+(aq) + 2 Cl-(aq) → PbCl2(s) 
D)  Pb2+(aq) + Cl22-(aq) → PbCl2(s)

Question 9

Which of the following is true regarding mass relationships in a chemical reaction?

Accepted Answer

A)  To determine mass relationships in a chemical reaction, you first need to know the balanced chemical equation for the reaction. 
B)  To convert from grams to moles and vice versa, you need to use Avogadro's number as a conversion factor. 
C)  Both a and b are true. 
D)  Both a and b are false. 
A)  To determine mass relationships in a chemical reaction, you first need to know the balanced chemical equation for the reaction. 
B)  To convert from grams to moles and vice versa, you need to use Avogadro's number as a conversion factor. 
C)  Both a and b are true. 
D)  Both a and b are false.

Question 10

The reactants in a chemical reaction are analogous to which of the following?

Accepted Answer

A)  a baked cake 
B)  the flour, eggs, chocolate used to bake a cake 
C)  both a and b 
D)  neither a nor b 
A)  a baked cake 
B)  the flour, eggs, chocolate used to bake a cake 
C)  both a and b 
D)  neither a nor b

Question 11

Which of the following compounds is soluble in water?

Accepted Answer

A)  AgCl 
B)  AgBr 
C)  AgI 
D)  AgC2H3O2 
A)  AgCl 
B)  AgBr 
C)  AgI 
D)  AgC2H3O2

Question 12

Which of the following is true of all combustion reactions?

Accepted Answer

A)  They are endothermic. 
B)  They produce carbon dioxide. 
C)  both a and b 
D)  neither a nor b 
A)  They are endothermic. 
B)  They produce carbon dioxide. 
C)  both a and b 
D)  neither a nor b

Question 13

How many molecules are present in one mole of glucose, C6H12O6?

Accepted Answer

A)  6.92 ×10-26 
B)  3.34 × 1021 
C)  6.02 × 1023 
D)  1.44 × 1025 
A)  6.92 ×10-26 
B)  3.34 × 1021 
C)  6.02 × 1023 
D)  1.44 × 1025

Question 14

The combustion of one mole of propane, C3H8, releases 531 kcal. How much heat is released by the combustion of 4.40 g of propane?

Accepted Answer

A)  53.1 kcal 
B)  531 kcal 
C)  5.31 × 103 kcal 
D)  5.31 × 104 kcal 
A)  53.1 kcal 
B)  531 kcal 
C)  5.31 × 103 kcal 
D)  5.31 × 104 kcal

Question 15

In the reaction Pb(s) + 2 Ag+(aq) → Pb2+(aq) + 2 Ag(s), which species is oxidized?

Accepted Answer

A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s) 
A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s)

Question 16

A bicycle manufacturer has a stock of 50 frames 70 wheels, and 160 reflectors. If each bicycle manufactured requires 4 reflectors, how many bicycles can the manufacturer make?

Accepted Answer

A)  25 
B)  35 
C)  40 
D)  50 
A)  25 
B)  35 
C)  40 
D)  50

Question 17

If you need a sample of 2.84 mol of Na2S, how many grams do you need?

Accepted Answer

A)  0.00451 g 
B)  2.84 g 
C)  78.1 g 
D)  222 g 
A)  0.00451 g 
B)  2.84 g 
C)  78.1 g 
D)  222 g

Question 18

What is the molecular weight of sucrose, C12H22O11?

Accepted Answer

A)  180.2 amu 
B)  319.6 amu 
C)  342.3 amu 
D)  360.4 amu 
A)  180.2 amu 
B)  319.6 amu 
C)  342.3 amu 
D)  360.4 amu

Question 19

Consider the following representation of a voltaic cell.   This voltaic cell is represented by the following reaction:
Mg(s) + CuS1U1P12+S1S1P0(aq) → Cu(s) + MgS1U1P12+S1S1P0(aq)
-In this reaction, what is the identity of the oxidizing agent?

Accepted Answer

A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+ 
A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+

Question 20

Consider the following representation of a voltaic cell.   This voltaic cell is represented by the following reaction:
Mg(s) + CuS1U1P12+S1S1P0(aq) → Cu(s) + MgS1U1P12+S1S1P0(aq)
-What is the identity of the "Metal" shown in the diagram?

Accepted Answer

A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+ 
A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+

Exam 4: Chemical Reactions

How many moles of hydrogen atoms are there in 2.50 mol of C6H12O6?

Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ___ C6H14(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

Which of the following is true of a chemical reaction?

When a solution of Cu(II) chloride, CuCl2 , is added to a solution of potassium sulfide, K2S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the total ionic equation for this reaction?

What is the molecular weight of ibuprofen, C13H18O2?

How many moles of oxygen atoms are present in 5.20 mol of Al2(SO4)3?

Of the following anions, which almost always forms soluble compounds?

When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the total ionic equation for this reaction?

Which of the following is true regarding mass relationships in a chemical reaction?

The reactants in a chemical reaction are analogous to which of the following?

Which of the following compounds is soluble in water?

Which of the following is true of all combustion reactions?

How many molecules are present in one mole of glucose, C6H12O6?

The combustion of one mole of propane, C3H8, releases 531 kcal. How much heat is released by the combustion of 4.40 g of propane?

In the reaction Pb(s) + 2 Ag+(aq) → Pb2+(aq) + 2 Ag(s), which species is oxidized?

A bicycle manufacturer has a stock of 50 frames 70 wheels, and 160 reflectors. If each bicycle manufactured requires 4 reflectors, how many bicycles can the manufacturer make?

If you need a sample of 2.84 mol of Na2S, how many grams do you need?

What is the molecular weight of sucrose, C12H22O11?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) -In this reaction, what is the identity of the oxidizing agent?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) -What is the identity of the "Metal" shown in the diagram?

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How many moles of hydrogen atoms are there in 2.50 mol of C₆H₁₂O₆?

Which of the following is the correct set of integer coefficients for the balanced equation, respectively: _ C₆H₁₄(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

When a solution of Cu(II) chloride, CuCl₂ , is added to a solution of potassium sulfide, K₂S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the total ionic equation for this reaction?

What is the molecular weight of ibuprofen, C₁₃H₁₈O₂?

How many moles of oxygen atoms are present in 5.20 mol of Al₂(SO₄)₃?

When a solution of ammonium chloride, NH₄Cl, is added to a solution of lead(II) nitrate, Pb(NO₃)₂, a white precipitate of lead chloride, PbCl₂, forms. Which of the following is the total ionic equation for this reaction?

How many molecules are present in one mole of glucose, C₆H₁₂O₆?

The combustion of one mole of propane, C₃H₈, releases 531 kcal. How much heat is released by the combustion of 4.40 g of propane?

In the reaction Pb(s) + 2 Ag⁺(aq) → Pb²⁺(aq) + 2 Ag(s), which species is oxidized?

If you need a sample of 2.84 mol of Na₂S, how many grams do you need?

What is the molecular weight of sucrose, C₁₂H₂₂O₁₁?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu²⁺(aq) → Cu(s) + Mg²⁺(aq) -In this reaction, what is the identity of the oxidizing agent?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu²⁺(aq) → Cu(s) + Mg²⁺(aq) -What is the identity of the "Metal" shown in the diagram?