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Worksheets2.1 RELATIVE ATOMIC AND MOLECULAR MASS
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
The relative atomic mass is the average mass of an atom compared to
a)
the mass of a carbon-12 atom.
b)
1/12 the mass of a carbon-12 atom
c)
the mass of a hydrogen atom
d)
1/12 the mass of a hydrogen atom
2.
The relative molecular mass of a compound is equal to the sum of its
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
3.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
4.
What is the relative molecular mass of fluorine gas, F2?
a)
19
b)
38
c)
9
d)
18
5.
What is the unit of relative molecular mass?
a)
kilogram
b)
gram
c)
gram per mole (g/mol)
d)
no units
6.
Each element is defined by the number of
a)
Atoms
b)
Isotopes
c)
Neutrons
d)
Protons
e)
Nuclei.
7.
What is the relative atomic mass (Ar) of Chlorine (Cl)?
a)
35.5
b)
17
c)
18.5
d)
0.5
8.
The atomic mass number of a specific element is determined by the:
a)
number of protons in its nucleus
b)
number of neutrons plus protons in its nucleus
c)
number of neutrons plus electrons in its nucleus
d)
number of electrons in its outermost shell
e)
total number of neutrons orbiting the nucleus
9.
The formula of a compound is M(OH)2. Given that the Mr of the compound is 98, calculate the Ar of M.
a)
32
b)
64
c)
81
d)
94
10.
What is the atomic mass of magnesium?
a)
2
b)
4
c)
12
d)
24
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