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Chemistry 2.2 (polymers (long chains of repeating units, lots of small…
Chemistry 2.2
polymers
long chains of repeating units
lots of small units linked together
strong covalent bonds
molecular formula = repeating unit in brackets and an 'n' outside to show it repeats
polymers are solid at room temperature
lower boiling points then ionic or giant molecular compounds
giant covalent structures
all atoms are bonded together by strong covalent bonds
very high boiling point
don't contain charged particles
don't conduct electricity
diamond and graphite are carbon atoms only
silicon dioxide (silica)
covalent bonding
sharing of electrons
non metals bonds
very strong electrostatic force
share from there outershell
different ways of drawing covalent bonds
dot and cross
shells overlap
don't show the relative size of atoms or how they are arranged in space
displayed formula
shows single lines between atoms
dont show 3d structure
3D models can get confusing
simple molecular substances
properties
covalent bonds usually have simple structures
very strong covalent bonds
between these molecules are very weak bonds
melting and boiling points are very low
gasses or liquids
bigger the molecules get the higher the boiling and melting point gets
do not conduct electricity