Question 1

Give a possible molecular formula for the empirical formula of C3H5ClO.

Accepted Answer

A)  C6H10ClO2 
B)  C5H10Cl2O2 
C)  C6H10Cl2O2 
D)  C6H10O2 
E)  C6H12Cl2O2 
A)  C6H10ClO2 
B)  C5H10Cl2O2 
C)  C6H10Cl2O2 
D)  C6H10O2 
E)  C6H12Cl2O2

Question 2

Write the formula for strontium nitrite.

Accepted Answer

A)  Sr3N2 
B)  SrNO3 
C)  SrN 
D)  Sr(NO2)2 
E)  Sr(NO2)3 
A)  Sr3N2 
B)  SrNO3 
C)  SrN 
D)  Sr(NO2)2 
E)  Sr(NO2)3

Question 3

Give 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

Question 4

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

Accepted Answer

A)  1.23 × 1023 C atoms 
B)  2.96 × 1024 C atoms 
C)  2.87 × 1025 C atoms 
D)  1.10 × 1024 C atoms 
E)  3.68 × 1023 C atoms 
A)  1.23 × 1023 C atoms 
B)  2.96 × 1024 C atoms 
C)  2.87 × 1025 C atoms 
D)  1.10 × 1024 C atoms 
E)  3.68 × 1023 C atoms

Question 5

Which of the compounds C4H10,SrCl2,Cr(NO3)3,OF2 are expected to exist as molecules?

Accepted Answer

A)  only C4H10 
B)  C4H10 and OF2 
C)  C4H10, Cr(NO3)2, and OF2 
D)  SrCl2 and Cr(NO3)2 
A)  only C4H10 
B)  C4H10 and OF2 
C)  C4H10, Cr(NO3)2, and OF2 
D)  SrCl2 and Cr(NO3)2

Question 6

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 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 7

Determine the name for N2O5.

Accepted Answer

A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen(V) oxide 
D)  nitrogen(III) oxide 
E)  nitrogen pentoxide 
A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen(V) oxide 
D)  nitrogen(III) oxide 
E)  nitrogen pentoxide

Question 8

Give the formula for ferrous nitrate.

Accepted Answer

A)  Fe(NO2)3 
B)  Fe(NO3)3 
C)  Fe(NO3)2 
D)  Fe(NO2)2 
E)  Fe2(NO2) 
A)  Fe(NO2)3 
B)  Fe(NO3)3 
C)  Fe(NO3)2 
D)  Fe(NO2)2 
E)  Fe2(NO2)

Question 9

Give the name for SnO.

Accepted Answer

A)  tin(I) oxide 
B)  tin(II) oxide 
C)  tin(III) oxide 
D)  tin(IV) oxide 
A)  tin(I) oxide 
B)  tin(II) oxide 
C)  tin(III) oxide 
D)  tin(IV) oxide

Question 10

What is the empirical formula for C10H20O5?

Accepted Answer

A)  C2H5O 
B)  CHO 
C)  C2H4O 
D)  CHO2 
E)  CH2O 
A)  C2H5O 
B)  CHO 
C)  C2H4O 
D)  CHO2 
E)  CH2O

Question 11

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol 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 12

Which of the following elements has the least tendency to form an ion?

Accepted Answer

A)  Ac 
B)  H 
C)  Ar 
D)  S 
A)  Ac 
B)  H 
C)  Ar 
D)  S

Question 13

A covalent bond is best described as

Accepted Answer

A)  the sharing of electrons between atoms. 
B)  the transfer of electrons. 
C)  a bond between a metal and a nonmetal. 
D)  a bond between a metal and a polyatomic ion. 
E)  a bond between two polyatomic ions. 
A)  the sharing of electrons between atoms. 
B)  the transfer of electrons. 
C)  a bond between a metal and a nonmetal. 
D)  a bond between a metal and a polyatomic ion. 
E)  a bond between two polyatomic ions.

Question 14

Combustion analysis of 63.8 mg of a C,H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O.What is the empirical formula for the compound?

Accepted Answer

A)  C5H2O 
B)  CHO 
C)  C3H6O 
D)  C3H7O 
E)  C6HO3 
A)  C5H2O 
B)  CHO 
C)  C3H6O 
D)  C3H7O 
E)  C6HO3

Question 15

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 16

Give the mass percent of carbon in C14H19NO2.

Accepted Answer

A)  72.07% 
B)  8.21% 
C)  6.00% 
D)  13.72% 
A)  72.07% 
B)  8.21% 
C)  6.00% 
D)  13.72%

Question 17

Determine the number of moles of sodium in 3.20 moles of sodium hydrogen phosphate.

Accepted Answer

A)  6.40 moles of sodium 
B)  3.20 moles of sodium 
C)  9.60 moles of sodium 
D)  1.60 moles of sodium 
E)  12.80 moles of sodium 
A)  6.40 moles of sodium 
B)  3.20 moles of sodium 
C)  9.60 moles of sodium 
D)  1.60 moles of sodium 
E)  12.80 moles of sodium

Question 18

What is the molar mass of pentane if 4.18 × 1016 molecules of pentane weigh 5.00 μg?

Accepted Answer

A)  72.0 g/mol 
B)  139 g/mol 
C)  288 g/mol 
D)  347 g/mol 
A)  72.0 g/mol 
B)  139 g/mol 
C)  288 g/mol 
D)  347 g/mol

Question 19

Define empirical formula.

Accepted Answer

An empirical formula

Question 20

Balance the following equation.
_____ C10H12 + _____ O2 → _____ H2O + _____ CO2

Accepted Answer

C₁₀H₁₂ + 13 O₂→

Exam 3: Molecules,compounds,and Chemical Equations

Give a possible molecular formula for the empirical formula of C3H5ClO.

Write the formula for strontium nitrite.

Give the name for P4O10.

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

Which of the compounds C4H10,SrCl2,Cr(NO3)3,OF2 are expected to exist as molecules?

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O.What is the empirical formula of the compound?

Determine the name for N2O5.

Give the formula for ferrous nitrate.

Give the name for SnO.

What is the empirical formula for C10H20O5?

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

Which of the following elements has the least tendency to form an ion?

A covalent bond is best described as

Combustion analysis of 63.8 mg of a C,H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O.What is the empirical formula for the compound?

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

Give the mass percent of carbon in C14H19NO2.

Determine the number of moles of sodium in 3.20 moles of sodium hydrogen phosphate.

What is the molar mass of pentane if 4.18 × 1016 molecules of pentane weigh 5.00 μg?

Define empirical formula.

Balance the following equation. _____ C10H12 + _____ O2 → _____ H2O + _____ CO2

Matter, measurement, and Problem Solving

Atoms and Elements

Chemical Quantities and Aqueous Reactions

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,

Liquids,solids,and Intermolecular Forces

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

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Give a possible molecular formula for the empirical formula of C₃H₅ClO.

Give the name for P₄O₁₀.

How many atoms of carbon are contained in 47.6 g of Al₂(CO₃)₃? The molar mass of Al₂(CO₃)₃is 233.99 g/mol.

Which of the compounds C₄H₁₀,SrCl₂,Cr(NO₃)₃,OF₂ are expected to exist as molecules?

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO₂ and 2.322 g of H₂O.What is the empirical formula of the compound?

Determine the name for N₂O₅.

What is the empirical formula for C₁₀H₂₀O₅?

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

Combustion analysis of 63.8 mg of a C,H and O containing compound produced 145.0 mg of CO₂ and 59.38 mg of H₂O.What is the empirical formula for the compound?

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

Give the mass percent of carbon in C₁₄H₁₉NO₂.

What is the molar mass of pentane if 4.18 × 10¹⁶ molecules of pentane weigh 5.00 μg?

Balance the following equation. ___ C₁₀H₁₂ + _ O₂→ _ H₂O + ___ CO₂