#1 How are the melting points and boiling
points of molecular compounds usually
different from ionic compounds.
Covalent Compounds often have Low melting
and boiling points due to weaker bonds between
atoms
Click on the picture to see the animation
#2 What information does a molecular formula provide?
H2O (Water)
A molecular formula
tells the types and
numbers of atoms in
a molecule.
It DOESNOT tell you
the way the atoms are
combined
#3 What are the only elements that exist in
nature as uncombined atoms? What term is
used to describe such elements?
He
Ne
Xe
Ar
Kr
Rn
Only the NOBLE GASES do not normally make
compounds. They are known as MONATOMIC
#4 Describe how the molecule whose formula is NO
is different from the molecule whose formula is N2O.
NO is one atom of
nitrogen and one of
oxygen.
N2O is TWO atoms of
nitrogen and one of
oxygen.
#5 Give an example of a diatomic molecule
found in Earth’s atmosphere.
Two Examples:
pictures of bonding
#6 What information does a molecule’s
molecular structure give?
A molecular FORMULA (example: H2O) only tells what atoms and how many
of each are present. It doesn’t show how those atoms are bound together.
A molecular STRUCTURE shows HOW the atoms are
bonded and arranged in the molecule:
Examples of Molecular structure
for Water