Chem 103: Module 4 EXAM, || Questions and Answers (Verified Answers)-
Complete Test (Latest Update 2026/2027) UPDATE!!
1. Avogadro's number 6.022 x 10^23 atoms = 1 mole
2. 1 u = ___ g 1.661 x 10 ^-24 g
3. formula mass the sum of the average atomic
masses of each atom represented
in the chemical formula and is ex-
pressed in atomic mass units.
--The formula mass of a covalent
compound is also called the mol-
ecular mass.
4. The chemical identity of a substance is defined by the types and relative numbers of
atoms composing its fundamental
entities (molecules in the case of
covalent compounds, ions in the
case of ionic compounds).
5. A compound's percent composition provides the mass percentage of each ele-
ment in the compound.
6. calculate the formula mass of a substance by summing the average atomic
masses of all the atoms represent-
ed in the substance's formula.
7. A mole is defined as the amount of substance contain-
ing the same number of discrete
entities (such as atoms, molecules,
and ions) as the number of atoms
in a sample of pure 12-C weighing
exactly 12 g
1/5
, Chem 103: Module 4 EXAM, || Questions and Answers (Verified Answers)-
Complete Test (Latest Update 2026/2027) UPDATE!!
8. percent composition the percentage by mass of each
element in a compound
i.e. mass X / mass compound x
100%
9. stoichiometry refers to the quantitative relation-
ships between amounts of reac-
tants and products in a chemical
reaction.
10. Combustion a reaction in which an element or
compound burns in air or oxygen
--The combustion of compounds
containing hydrogen and carbon
(CxHy) will always produce two
products: water (H2O) and carbon
dioxide (CO2).
--The same is true for the combus-
tion of compounds containing hy-
drogen, carbon and oxygen (Cx-
HyOz)
11. Chemical formulas provide the identities of the reactants and
products involved in the chemical
change, allowing classification of
the reaction
12. Coefficients provide the relative numbers of these chemical
species, allowing a quantitative as-
sessment of the relationships be-
tween the amounts of substances
2/5
Complete Test (Latest Update 2026/2027) UPDATE!!
1. Avogadro's number 6.022 x 10^23 atoms = 1 mole
2. 1 u = ___ g 1.661 x 10 ^-24 g
3. formula mass the sum of the average atomic
masses of each atom represented
in the chemical formula and is ex-
pressed in atomic mass units.
--The formula mass of a covalent
compound is also called the mol-
ecular mass.
4. The chemical identity of a substance is defined by the types and relative numbers of
atoms composing its fundamental
entities (molecules in the case of
covalent compounds, ions in the
case of ionic compounds).
5. A compound's percent composition provides the mass percentage of each ele-
ment in the compound.
6. calculate the formula mass of a substance by summing the average atomic
masses of all the atoms represent-
ed in the substance's formula.
7. A mole is defined as the amount of substance contain-
ing the same number of discrete
entities (such as atoms, molecules,
and ions) as the number of atoms
in a sample of pure 12-C weighing
exactly 12 g
1/5
, Chem 103: Module 4 EXAM, || Questions and Answers (Verified Answers)-
Complete Test (Latest Update 2026/2027) UPDATE!!
8. percent composition the percentage by mass of each
element in a compound
i.e. mass X / mass compound x
100%
9. stoichiometry refers to the quantitative relation-
ships between amounts of reac-
tants and products in a chemical
reaction.
10. Combustion a reaction in which an element or
compound burns in air or oxygen
--The combustion of compounds
containing hydrogen and carbon
(CxHy) will always produce two
products: water (H2O) and carbon
dioxide (CO2).
--The same is true for the combus-
tion of compounds containing hy-
drogen, carbon and oxygen (Cx-
HyOz)
11. Chemical formulas provide the identities of the reactants and
products involved in the chemical
change, allowing classification of
the reaction
12. Coefficients provide the relative numbers of these chemical
species, allowing a quantitative as-
sessment of the relationships be-
tween the amounts of substances
2/5
