Question 1

The correct chemical name for the compound KNO2 is ________.

Accepted Answer

A)  potassium nitrate
B)  potassium nitrite
C)  potassium nitrogen dioxide
D)  potassium nitrous oxide
E)  potassium hyponitrite

Question 2

Organic chemistry refers to compounds of oxygen,and hydrogen.

Accepted Answer

A) True 
 B)False

Question 3

The chemical formula for lithium peroxide is:

Accepted Answer

A)  LiOH
B)  LiO2
C)  Li2O
D)  Li2O2

Question 4

Which of the following is the correct definition of an isomer?

Accepted Answer

A)  Isomers are molecules that have the same empirical formula but different arrangements of atoms in space.
B)  Isomers are molecules that have the same molecular formula but different arrangements of atoms in space.
C)  Isomers are molecules that have the same arrangements of atoms in space but different empirical and molecular formulas.
D)  Isomers are molecules that have the same molecular formula but contain different isotopes.
E)  Isomers are molecules with the same empirical formula but have different isotopes.

Question 5

The correct chemical name for the compound SbCl3 is ________.

Accepted Answer

A)  tin trichloride
B)  tin chloride
C)  stannous trichloride
D)  antimony(IV) chloride
E)  antimony(III) chloride

Question 6

The chemical formula for calcium nitride is:

Accepted Answer

A)  Ca(NO3) 2
B)  Ca(NO2) 2
C)  Ca3N2
D)  CaN2

Question 7

The element M forms the chloride MCl4 containing 75.0% Cl by mass.What is the molar mass of M?

Accepted Answer

A)  22.7 g/mol
B)  21.2 g/mol
C)  11.8 g/mol
D)  39.55 g/mol
E)  47.3 g/mol

Question 8

Choose the INCORRECT name formula combination.

Accepted Answer

A)  Fe2(SO4) 3 iron(III) sulfate
B)  HBrO3 bromic acid
C)  PCl5 phosphorus chloride
D)  SCl4 sulfur tetrachloride
E)  Sr(IO3) 2 strontium iodate

Question 9

Which of the following has the greatest mass?

Accepted Answer

A)  3.88 × 1022 molecules of O2
B)  1.00 g of O2
C)  0.0312 mol of O2
D)  All of the above have the same mass.

Question 10

What is the percentage by weight of phosphorus in calcium phosphate,Ca3(PO4) 2?

Accepted Answer

A)  20%
B)  10%
C)  36%
D)  29%
E)  40%

Question 11

How many moles are there in 3.00 g of ethanol,CH3CH2OH?

Accepted Answer

A)  0.00725 mol
B)  0.0652 mol
C)  15.3 mol
D)  138 mol

Question 12

Choose the INCORRECT statement.

Accepted Answer

A)  A molecule is a group of bonded atoms that exist as an entity.
B)  Ionic compounds result from combinations of metals and nonmetals.
C)  An anion is a positive ion.
D)  The empirical formula is the simplest formula of the ratio of atoms.
E)  The molecular formula is the listing of the atoms in an actual molecule.

Question 13

What is the chemical formula for magnesium hydride?

Accepted Answer

A)  MgH2
B)  MgOH
C)  MgOH2
D)  Mg(OH) 2

Question 14

Choose the INCORRECT oxidation state.

Accepted Answer

A)  C is 0 in H2CO
B)  S is +4 in H2SO3 
C)  C is +2 in HCOOH
D)  Fe is +2 in Fe2O3 
E)  Mn is +7 in KMnO4

Question 15

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO2 and 0.1451 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  CH2
B)  C2H5
C)  C4H10
D)  C5H2

Question 16

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

Accepted Answer

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

Question 17

Arrange the following in order of increasing oxidation state of chlorine:
NaClO,NaClO3,NaClO2, and NaClO4.

Accepted Answer

A)  NaClO,NaClO2,NaClO3,NaClO4 
B)  NaClO4,NaClO3,NaClO2,NaClO
C)  NaClO,NaClO3,NaClO2,NaClO4 
D)  NaClO4,NaClO,NaClO3,NaClO2 
E)  NaClO3,NaClO2,NaClO,NaClO4

Question 18

A strip of electrolytically purified copper weighing 3.178 grams is strongly heated in a stream of oxygen until it is all converted to a black oxide.The resultant black powder weighs 3.978 g.What is the formula of the oxide?

Accepted Answer

A)  CuO2 
B)  Cu2O3 
C)  CuO3 
D)  Cu2O
E)  CuO

Question 19

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

Accepted Answer

Question 20

Naphthalene,commonly found in mothballs,is 93.75% carbon and 6.25% hydrogen by mass.If naphthalene's molecular formula is twice its empirical formula,what would its molecular mass be?

Accepted Answer

A)  64 u
B)  96 u
C)  128 u
D)  192 u 
E)  160 u

Exam 3: Chemical Compounds

Choose the INCORRECT name formula combination.

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Choose the INCORRECT oxidation state.

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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO2 and 0.1451 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

What is the chemical formula for magnesium hydride?

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Choose the INCORRECT statement.

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The element M forms the chloride MCl4 containing 75.0% Cl by mass.What is the molar mass of M?

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How many moles are there in 3.00 g of ethanol,CH3CH2OH?

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The chemical formula for lithium peroxide is:

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

Correct AnswerverifiedShow Answer

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

Correct AnswerverifiedShow Answer

The correct chemical name for the compound KNO2 is ________.

Correct AnswerverifiedShow Answer

A strip of electrolytically purified copper weighing 3.178 grams is strongly heated in a stream of oxygen until it is all converted to a black oxide.The resultant black powder weighs 3.978 g.What is the formula of the oxide?

Correct AnswerverifiedShow Answer

The correct chemical name for the compound SbCl3 is ________.

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What is the percentage by weight of phosphorus in calcium phosphate,Ca3(PO4) 2?

Correct AnswerverifiedShow Answer

Organic chemistry refers to compounds of oxygen,and hydrogen.

Correct AnswerverifiedShow Answer

Naphthalene,commonly found in mothballs,is 93.75% carbon and 6.25% hydrogen by mass.If naphthalene's molecular formula is twice its empirical formula,what would its molecular mass be?

Correct AnswerverifiedShow Answer

Which of the following has the greatest mass?

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The chemical formula for calcium nitride is:

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Which of the following is the correct definition of an isomer?

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Arrange the following in order of increasing oxidation state of chlorine: NaClO,NaClO3,NaClO2, and NaClO4.

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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO₂ and 0.1451 g of H₂O.What is the empirical formula of the compound?

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The element M forms the chloride MCl₄ containing 75.0% Cl by mass.What is the molar mass of M?

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How many moles are there in 3.00 g of ethanol,CH₃CH₂OH?

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

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A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO₂ and 58.70 g of H₂O.What is the empirical formula of the alcohol?

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The correct chemical name for the compound KNO₂ is ________.

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The correct chemical name for the compound SbCl₃ is ________.

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What is the percentage by weight of phosphorus in calcium phosphate,Ca₃(PO₄) ₂?

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Arrange the following in order of increasing oxidation state of chlorine: NaClO,NaClO₃,NaClO_2, and NaClO₄.

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