Question 1

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g/mol.

Accepted Answer

A)  9.83 × 1020 C2H4 molecules 
B)  7.74 × 1026 C2H4 molecules 
C)  2.71 × 1020 C2H4 molecules 
D)  3.69 × 1023 C2H4 molecules 
E)  4.69 × 1023 C2H4 molecules 
A)  9.83 × 1020 C2H4 molecules 
B)  7.74 × 1026 C2H4 molecules 
C)  2.71 × 1020 C2H4 molecules 
D)  3.69 × 1023 C2H4 molecules 
E)  4.69 × 1023 C2H4 molecules

Question 2

Identify the substance that conducts electricity.

Accepted Answer

A)  NaCl dissolved in water 
B)  solid NaCl 
C)  ethanol 
D)  solid baking soda 
E)  sugar dissolved in water. 
A)  NaCl dissolved in water 
B)  solid NaCl 
C)  ethanol 
D)  solid baking soda 
E)  sugar dissolved in water.

Question 3

Use the data given below to construct a Born-Haber cycle to determine the heat of formation of KCl. DH°(kJ)
K(s)→ K(g)89
K(g)→ K⁺(g)+ e⁻ 418
Cl2(g)→ 2 Cl(g)244
Cl(g)+ e⁻ → Cl⁻(g)-349
KCl(s)→ K⁺(g)+ Cl⁻(g)717

Accepted Answer

A)  -1119 kJ 
B)  -997 kJ 
C)  -437 kJ 
D)  +631 kJ 
E)  +158 kJ 
A)  -1119 kJ 
B)  -997 kJ 
C)  -437 kJ 
D)  +631 kJ 
E)  +158 kJ

Question 4

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.

Accepted Answer

A)  1.52 × 1027 sodium ions 
B)  4.76 × 1020 sodium ions 
C)  2.10 × 1021 sodium ions 
D)  1.05 × 1021 sodium ions 
E)  9.52 × 1020 sodium ions 
A)  1.52 × 1027 sodium ions 
B)  4.76 × 1020 sodium ions 
C)  2.10 × 1021 sodium ions 
D)  1.05 × 1021 sodium ions 
E)  9.52 × 1020 sodium ions

Question 5

Place the following in order of increasing magnitude of lattice energy. CaO MgO SrS

Accepted Answer

A)  MgO < CaO < SrS 
B)  SrS < MgO < CaO 
C)  SrS < CaO < MgO 
D)  CaO < MgO < SrS 
E)  CaO < SrS < MgO 
A)  MgO < CaO < SrS 
B)  SrS < MgO < CaO 
C)  SrS < CaO < MgO 
D)  CaO < MgO < SrS 
E)  CaO < SrS < MgO

Question 6

The chemical formula for the chlorite ion is

Accepted Answer

A)  Cl-. 
B)  Cl3-. 
C)  ClO2-. 
D)  ClO3-. 
A)  Cl-. 
B)  Cl3-. 
C)  ClO2-. 
D)  ClO3-.

Question 7

How many Fe(II)ions are there in 10.0 g of FeSO4?

Accepted Answer

A)  1.93 × 10-25 iron(II) ions 
B)  3.96 × 1022 iron(II) ions 
C)  9.15 × 1024 iron(II) ions 
D)  9.14 × 1026 iron(II) ions 
A)  1.93 × 10-25 iron(II) ions 
B)  3.96 × 1022 iron(II) ions 
C)  9.15 × 1024 iron(II) ions 
D)  9.14 × 1026 iron(II) ions

Question 8

Determine the empirical formula for a compound that contains C,H and O.It contains 52.14% C and 34.73% O by mass.

Accepted Answer

A)  C2H6O 
B)  CHO 
C)  C4H13O2 
D)  CH4O3 
E)  CH3O 
A)  C2H6O 
B)  CHO 
C)  C4H13O2 
D)  CH4O3 
E)  CH3O

Question 9

Give the name for HNO3.

Accepted Answer

A)  nitric acid 
B)  nitrous acid 
C)  hydrogen nitrate 
D)  hydrogen nitrite 
E)  hydrogen nitride 
A)  nitric acid 
B)  nitrous acid 
C)  hydrogen nitrate 
D)  hydrogen nitrite 
E)  hydrogen nitride

Question 10

Which of the following is one possible form of pentane?

Accepted Answer

A)  CH3CH2CH2CH2CH3 
B)  CH3CH=CHCH2CH3 
C)  CH3CH2CH2CH2CH2CH3 
D)  CH3CH2CH2CH2CH2NH2 
E)  CH3CH2-O-CH2CH2CH3 
A)  CH3CH2CH2CH2CH3 
B)  CH3CH=CHCH2CH3 
C)  CH3CH2CH2CH2CH2CH3 
D)  CH3CH2CH2CH2CH2NH2 
E)  CH3CH2-O-CH2CH2CH3

Question 11

The molecular weight of urea ((NH2)2CO),a compound used as a nitrogen fertilizer,is ________ amu (rounded to one decimal place).

Accepted Answer

A)  44.0 
B)  43.0 
C)  60.1 
D)  8.0 
E)  32.0 
A)  44.0 
B)  43.0 
C)  60.1 
D)  8.0 
E)  32.0

Question 12

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g/mL and the molar mass is 58.12 g/mol.

Accepted Answer

A)  2.59 × 1023 molecules butane 
B)  1.46 × 1027 molecules butane 
C)  6.87 × 1023 molecules butane 
D)  1.56 × 1023 molecules butane 
E)  7.14 × 1025 molecules butane 
A)  2.59 × 1023 molecules butane 
B)  1.46 × 1027 molecules butane 
C)  6.87 × 1023 molecules butane 
D)  1.56 × 1023 molecules butane 
E)  7.14 × 1025 molecules butane

Question 13

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Accepted Answer

A)  AlN 
B)  MgO 
C)  Li F 
D)  CaS 
E)  Rb F 
A)  AlN 
B)  MgO 
C)  Li F 
D)  CaS 
E)  Rb F

Question 14

Which of the following represent the Lewis structure for N?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 15

Write the formula for the compound formed between lithium and sulfur.

Accepted Answer

A)  LiS 
B)  LiS2 
C)  Li2S 
D)  Li2SO3 
E)  Li3S2 
A)  LiS 
B)  LiS2 
C)  Li2S 
D)  Li2SO3 
E)  Li3S2

Question 16

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Accepted Answer

A)  SrI2 
B)  MgF2 
C)  Ba Cl2 
D)  SrF2 
E)  Sr Cl2 
A)  SrI2 
B)  MgF2 
C)  Ba Cl2 
D)  SrF2 
E)  Sr Cl2

Question 17

What is the empirical formula for a compound that is composed of 53.91% carbon.35.91% oxygen,and 10.17% hydrogen?

Accepted Answer

A)  CHO 
B)  C4H9O2 
C)  C2H4O3 
D)  CH2O2 
E)  C3H6O 
A)  CHO 
B)  C4H9O2 
C)  C2H4O3 
D)  CH2O2 
E)  C3H6O

Question 18

Give the name for NaHSO3.

Accepted Answer

A)  monosodium sulfite 
B)  monosodium sulfate 
C)  sodium bisulfate 
D)  sodium bisulfite 
E)  sodium bisulfide 
A)  monosodium sulfite 
B)  monosodium sulfate 
C)  sodium bisulfate 
D)  sodium bisulfite 
E)  sodium bisulfide

Question 19

Describe the difference between ionic and molecular compounds.Give an example of each.

Accepted Answer

An ionic compound is formed between a me

Question 20

Which of the following represent the Lewis structure for S2⁻?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Exam 5: Molecules and Compounds

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g/mol.

Identify the substance that conducts electricity.

Use the data given below to construct a Born-Haber cycle to determine the heat of formation of KCl. DH°(kJ) K(s)→ K(g)89 K(g)→ K⁺(g)+ e⁻ 418 Cl2(g)→ 2 Cl(g)244 Cl(g)+ e⁻ → Cl⁻(g)-349 KCl(s)→ K⁺(g)+ Cl⁻(g)717

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.

Place the following in order of increasing magnitude of lattice energy. CaO MgO SrS

The chemical formula for the chlorite ion is

How many Fe(II)ions are there in 10.0 g of FeSO4?

Determine the empirical formula for a compound that contains C,H and O.It contains 52.14% C and 34.73% O by mass.

Give the name for HNO3.

Which of the following is one possible form of pentane?

The molecular weight of urea ((NH2)2CO),a compound used as a nitrogen fertilizer,is ________ amu (rounded to one decimal place).

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g/mL and the molar mass is 58.12 g/mol.

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Which of the following represent the Lewis structure for N?

Write the formula for the compound formed between lithium and sulfur.

Choose the compound below that should have the highest melting point according to the ionic bonding model.

What is the empirical formula for a compound that is composed of 53.91% carbon.35.91% oxygen,and 10.17% hydrogen?

Give the name for NaHSO3.

Describe the difference between ionic and molecular compounds.Give an example of each.

Which of the following represent the Lewis structure for S2⁻?

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g/mol.

Use the data given below to construct a Born-Haber cycle to determine the heat of formation of KCl. DH°(kJ) K(s)→ K(g)89 K(g)→ K⁺(g)+ e⁻ 418 Cl₂(g)→ 2 Cl(g)244 Cl(g)+ e⁻ → Cl⁻(g)-349 KCl(s)→ K⁺(g)+ Cl⁻(g)717

How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g/mol.

How many Fe(II)ions are there in 10.0 g of FeSO₄?

Give the name for HNO₃.

The molecular weight of urea ((NH₂)₂CO),a compound used as a nitrogen fertilizer,is ________ amu (rounded to one decimal place).

Give the name for NaHSO₃.

Which of the following represent the Lewis structure for S²⁻?