Question 1

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?

Accepted Answer

A)  2.27 g 
B)  7.70 g 
C)  15.0 g 
D)  20.5 g 
A)  2.27 g 
B)  7.70 g 
C)  15.0 g 
D)  20.5 g

Question 2

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 3

The molecular weight of sucrose (C12H22O11), table sugar, is ________ amu (rounded to one decimal place).

Accepted Answer

A)  330.3 
B)  342.3 
C)  29.0 
D)  45.0 
E)  182.0 
A)  330.3 
B)  342.3 
C)  29.0 
D)  45.0 
E)  182.0

Question 4

Identify the charge, X, on the phosphide ion PX.

Accepted Answer

A)  -4 
B)  -3 
C)  -2 
D)  -1 
E)  +1 
A)  -4 
B)  -3 
C)  -2 
D)  -1 
E)  +1

Question 5

Which of the following is the correct chemical formula for a molecule of astatine?

Accepted Answer

A)  At 
B)  At- 
C)  At+ 
D)  At2 
A)  At 
B)  At- 
C)  At+ 
D)  At2

Question 6

What is the mass of 8.50 × 1022 molecules of NH3?

Accepted Answer

A)  0.00 829 g 
B)  0. 417 g 
C)  2. 40 g 
D)  121 g 
A)  0.00 829 g 
B)  0. 417 g 
C)  2. 40 g 
D)  121 g

Question 7

Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%, H 4.48%, O 35.52%. Determine the empirical formula.

Accepted Answer

A)  C9H9O5 
B)  C9H8O3 
C)  C8H9O4 
D)  C9H8O4 
E)  C8H8O4 
A)  C9H9O5 
B)  C9H8O3 
C)  C8H9O4 
D)  C9H8O4 
E)  C8H8O4

Question 8

Identify the name for Sr(NO3)2∙4H2O.

Accepted Answer

A)  tin(II) nitrate tetrahydrate 
B)  strontium nitrate tetrahydrate 
C)  scandium nitrate tetrahydrate 
D)  tin(III) nitrate tetrahydrate 
E)  tin(II) nitrate quadhydrate 
A)  tin(II) nitrate tetrahydrate 
B)  strontium nitrate tetrahydrate 
C)  scandium nitrate tetrahydrate 
D)  tin(III) nitrate tetrahydrate 
E)  tin(II) nitrate quadhydrate

Question 9

Determine the molecular formula of a compound that has a molar mass of 183.2 g mol-1 and an empirical formula of C2H5O2.

Accepted Answer

A)  C2H5O2 
B)  C6H15O6 
C)  C3H7O3 
D)  C4H10O4 
E)  C8H20O8 
A)  C2H5O2 
B)  C6H15O6 
C)  C3H7O3 
D)  C4H10O4 
E)  C8H20O8

Question 10

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Accepted Answer

A)  0.0113 g 
B)  0.0417 g 
C)  24.0 g 
D)  11.3 g 
E)  0.0799 g 
A)  0.0113 g 
B)  0.0417 g 
C)  24.0 g 
D)  11.3 g 
E)  0.0799 g

Question 11

Identify the formula for sulfurous acid.

Accepted Answer

A)  H2SO3 
B)  HSO3 
C)  H2SO4 
D)  HSO4 
A)  H2SO3 
B)  HSO3 
C)  H2SO4 
D)  HSO4

Question 12

Calculate the mass percent composition of sulfur in Al2(SO4)3.

Accepted Answer

A)  28.11% 
B)  9.372% 
C)  42.73% 
D)  21.38% 
E)  35.97% 
A)  28.11% 
B)  9.372% 
C)  42.73% 
D)  21.38% 
E)  35.97%

Question 13

The compound Cu( N O2)2, is named ________.

Accepted Answer

A)  copper nitrite(II) 
B)  copper(I) nitrite 
C)  copper(I) nitrite(II) 
D)  copper(II) nitrite 
A)  copper nitrite(II) 
B)  copper(I) nitrite 
C)  copper(I) nitrite(II) 
D)  copper(II) nitrite

Question 14

Give the mass percent of carbon in C14H19NO2.

Accepted Answer

A)  38.89% 
B)  71.46% 
C)  5.17% 
D)  2.78% 
A)  38.89% 
B)  71.46% 
C)  5.17% 
D)  2.78%

Question 15

Which of the following statements is TRUE?

Accepted Answer

A)  A molecular formula gives the actual number of atoms of each element in a molecule. 
B)  The structural formula shows the geometry of the molecule. 
C)  Metals and nonmetals bond to form a molecular compound. 
D)  Covalently bonded nonmetals produce an ionic compound. 
E)  Organic compounds containing double bonds between the carbon atoms are known as alkynes. 
A)  A molecular formula gives the actual number of atoms of each element in a molecule. 
B)  The structural formula shows the geometry of the molecule. 
C)  Metals and nonmetals bond to form a molecular compound. 
D)  Covalently bonded nonmetals produce an ionic compound. 
E)  Organic compounds containing double bonds between the carbon atoms are known as alkynes.

Question 16

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

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 17

What is the common name of the polyatomic anion ClO4?

Accepted Answer

A)  Chlorite 
B)  Chlorate 
C)  Perchlorate 
D)  Chloride 
E)  Hypochlorite 
A)  Chlorite 
B)  Chlorate 
C)  Perchlorate 
D)  Chloride 
E)  Hypochlorite

Question 18

What is the charge on an aluminum ion?

Accepted Answer

A)  +3 
B)  +2 
C)  +1 
D)  -1 
E)  -2 
A)  +3 
B)  +2 
C)  +1 
D)  -1 
E)  -2

Question 19

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

Accepted Answer

A)  8.59 mL 
B)  13.5 mL 
C)  7.40 mL 
D)  12.4 mL 
E)  11.6 mL 
A)  8.59 mL 
B)  13.5 mL 
C)  7.40 mL 
D)  12.4 mL 
E)  11.6 mL

Question 20

Determine the name for P4O10.

Accepted Answer

A)  phosphorus(IV) oxide 
B)  diphosphorus pentoxide 
C)  phosphorus oxide 
D)  phosphorus(II) oxide 
E)  tetraphosphorus decoxide 
A)  phosphorus(IV) oxide 
B)  diphosphorus pentoxide 
C)  phosphorus oxide 
D)  phosphorus(II) oxide 
E)  tetraphosphorus decoxide

Exam 3: Molecules, Compounds, and Nomenclature

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?

Which of the following is one possible form of pentane?

The molecular weight of sucrose (C12H22O11), table sugar, is ________ amu (rounded to one decimal place).

Identify the charge, X, on the phosphide ion PX.

Which of the following is the correct chemical formula for a molecule of astatine?

What is the mass of 8.50 × 1022 molecules of NH3?

Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%, H 4.48%, O 35.52%. Determine the empirical formula.

Identify the name for Sr(NO3)2∙4H2O.

Determine the molecular formula of a compound that has a molar mass of 183.2 g mol-1 and an empirical formula of C2H5O2.

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Identify the formula for sulfurous acid.

Calculate the mass percent composition of sulfur in Al2(SO4)3.

The compound Cu( N O2)2, is named ________.

Give the mass percent of carbon in C14H19NO2.

Which of the following statements is TRUE?

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

What is the common name of the polyatomic anion ClO4?

What is the charge on an aluminum ion?

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

Determine the name for P4O10.

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Chemical Reactions and Stoichiometry

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

The molecular weight of sucrose (C₁₂H₂₂O₁₁), table sugar, is ________ amu (rounded to one decimal place).

Identify the charge, X, on the phosphide ion P^X.

What is the mass of 8.50 × 10²² molecules of NH₃?

Identify the name for Sr(NO₃)₂∙4H₂O.

Determine the molecular formula of a compound that has a molar mass of 183.2 g mol^-1 and an empirical formula of C₂H₅O₂.

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 10²³molecules of formic acid.

Calculate the mass percent composition of sulfur in Al₂(SO₄)₃.

The compound Cu( NO₂)₂, is named ________.

Give the mass percent of carbon in C₁₄H₁₉NO₂.

How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g mol^-1.

What is the common name of the polyatomic anion ClO₄?

Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane. The density of hexane is 0.6548 g mL^-1 and its molar mass is 86.18 g mol^-1.

Determine the name for P₄O₁₀.