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WorksheetsChapter 5: Chemical Quantities
Total questions: 15
Worksheet time: 9mins
In determining atomic mass units, the standard is the
carbon-12 atom.
hydrogen-1 atom.
carbon-14 atom.
oxygen-16 atom.
The atomic mass unit is used to express
atomic mass.
atomic number.
atomic mass number.
molar mass.
The unit g/mol is the unit of
atomic mass.
atomic number.
molar mass.
atomic mass number.
The number of atoms in a mole of any element is called
its atomic number.
the molar mass number.
Avogadro’s number.
the gram-atomic number.
Using a periodic table, find the identity of the element that has an atomic mass of 40.078 amu.
C
Ca
Cr
Cu
Using a periodic table, determine which of the following quantities is not equal to 1.00 mole.
6.02 x 10^23 carbon atoms
79.9 g Br
26.0 g Fe
65.4 g Zn
Avogadro’s number is
6.022 x 10^23
3.1416
1.602 x 10^-24
3.0 x 10^-8
The molar mass of an element is numerically equal to the
element’s atomic mass.
number of neutrons found in the element.
element’s atomic number.
mass of one atom of the element.
What is the molar volume of a gas at standard temperature and pressure (STP)?
1.0 atm/mol
22.4 L/mol
1.0 L/22.4 mol
22.4 atm/mol
_____ gives the actual number of atoms in the structure of the molecule, as opposed to just the ratio.
empirical formula
density
molecular formula
percent composition
The _____ of a compound gives the lowest whole-number ratio of the atoms or moles of elements in a compound.
density
percent composition
molecular formula
empirical formula
The ____ states that any sample of a compound will be made up of the same elements in the same ratio.
percent composition
law of constant composition
law of definite proportions
density
_____ is the percent by mass of each element in the compound.
law of definite proportions
law of constant composition
density
percent composition
_____ is the ratio of the mass of a substance to its volume.
Mole
Density
Molar mass
Percent composition
The term _____ refers to the species present in a substance, usually atoms, molecules, or formula units.
representative particle
Avogadro's number
mole
molar mass
