WorksheetsCFA - Mole Conversions
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Why do chemists use moles instead of actual masses of atoms?
a)
Atoms and molecules are too small to see under a microscope.
b)
Actual masses of atoms, molecules, and ions are too small to use in calculations.
c)
Moles help determine the density of an atom.
d)
Moles are used to identify isotopes of an element.
2.
What is the symbol for a mole?
a)
mo
b)
ml
c)
mn
d)
mol
3.
What is the symbol for mass?
a)
kg
b)
k
c)
g
d)
gs
4.
Why is the mole used in chemistry?
a)
To measure the exact weight of an atom.
b)
To simplify calculations for large numbers of particles.
c)
To determine the density of a substance.
d)
To balance chemical equations automatically.
5.
How many particles are in 1 mole of a substance?
a)
6.02×10 to the power of 22
b)
6.01×10 to the power of 23
c)
6.02×10 to the power of 23
d)
6.01×10 to the power of 22
6.
If 4 moles of NaCl are present, what is the mass (in grams)? (Molar Mass of NaCl = 58.44 g/mol)
a)
58.44 g
b)
116.88 g
c)
233.76 g
d)
29.22 g
7.
If a sample of CH₄ has a mass of 48.12 g, how many moles are present? (Molar Mass of CH₄ = 16.04 g/mol)
a)
3.00 moles
b)
0.33 moles
c)
1.00 moles
d)
2.35 moles
8.
What is a relative atomic mass?
a)
The total number of protons and neutrons in the nucleus of an atom.
b)
The average mass of an atom of an element in atomic mass units.
c)
The combined mass of all the electrons in an atom’s structure.
d)
The measured weight of a molecule in grams per atomic unit.
9.
Where can the relative atomic mass of an element be found?
a)
It is found next to the element’s symbol on the periodic table.
b)
It is written at the top of the element’s symbol on the periodic table.
c)
It is found under the element’s symbol on the periodic table.
d)
It is listed beside the element’s symbol on the periodic table.
10.
How do you calculate the number of moles of a substance?
a)
Multiply the given mass by the molar mass.
b)
Divide the given mass by the molar mass.
c)
Add the given mass to the molar mass.
d)
Subtract the molar mass from the given mass.
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