Chemical Formula Worksheet With Answers
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CHEMICAL FORMULAE (ANSWERS)
ionic bonds = electrons have been transferred between atoms, resulting in oppositely
charged ions that attract each other. Contain cations and anions.
covalent bonds = two atoms share some of their electrons.
Atomic element = one atom e.g. Ne, Xe
Molecular element = elements whose particles are multi-atom molecules (e.g. Cl
, H
,
2
2
P
).
4
compounds are generally represented with a chemical formula. Molecular
compounds contain non-metals (e.g. H
O, HCl) and ionic compounds contain cations
2
and anions (e.g. NaCl, Na
SO
).
2
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Empirical formula = the kinds of elements found in the compound and the ratio of their
atoms.
Molecular formula = the kinds of elements found in the compound and the numbers of
their atoms.
Structural formula = the kinds of elements found in the compound, the numbers of their
atoms, order of atom attachment, and the kind of attachment.
Models show the 3-dimensional structure along with all the other information given in
structural formula.
Molecule
Empirical formula
Molecular formula
1. propane
C
H
C
H
3
8
3
8
2. benzene
CH
C
H
6
6
H
H
H
H
C
C
C
H
H
H
H
1.
structural
ball-and-stick
space-filling
H
H
C
H
C
C
C
C
H
C
H
H
2. structural
ball-and-stick
space-filling
WRITING IONIC FORMULAS
Write the formula of a compound made from aluminum ions and oxide ions
3+
1. Write the symbol for the metal cation and its charge
Al
Group 3A
2-
2. Write the symbol for the nonmetal anion and its charge
O
Group 6A
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