Question 1

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

Question 2

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

Question 3

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 4

What is the chemical formula for magnesium hydride?

Accepted Answer

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

Question 5

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 
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 6

The chemical formula for calcium nitride is:

Accepted Answer

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

Question 7

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. 
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 8

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. 
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 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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  
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 14

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 
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 15

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

Question 16

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

Question 17

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. 
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 18

Organic chemistry refers to compounds of oxygen,and hydrogen.

Accepted Answer

A) True 
 B)False

Question 19

The chemical formula for lithium peroxide is:

Accepted Answer

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

Question 20

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  
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

Exam 3: Chemical Compounds

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

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?

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?

What is the chemical formula for magnesium hydride?

Choose the INCORRECT name formula combination.

The chemical formula for calcium nitride is:

Which of the following has the greatest mass?

Choose the INCORRECT statement.

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?

The correct chemical name for the compound SbCl3 is ________.

The correct chemical name for the compound KNO2 is ________.

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

Choose the INCORRECT oxidation state.

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

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

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?

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

Organic chemistry refers to compounds of oxygen,and hydrogen.

The chemical formula for lithium peroxide is:

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

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

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

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?

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?

The correct chemical name for the compound SbCl₃ is ________.

The correct chemical name for the compound KNO₂ is ________.

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

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

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

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