860428
Beschreibung
Mindmap von Evangeline Taylor, aktualisiert more than 1 year ago
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Erstellt von Evangeline Taylor
vor mehr als 10 Jahre
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Covalent Substances:
Two Kinds
- Substances with covalent bonds (electron
Sharing) can either be simple molecules or
giant structures
- Simple Molecular Substance
- The atom forms a very strong covalent
bond to form small molecules of several
atoms.
- By contrast, the forces of
attraction between these
molecules are very weak
- The result of these
feeble
intermolecular
forces
- The melting and boiling
point are very low
- Because molecules are
easily parted from each
other.
- The melting and boiling
point are very low
- It’s the intermolecular forces that get
broken when simple molecular substances
melt or boil – not the much stronger
covalent bonds.
- Most molecular substances are gases
or liquids at room temperature but they
can be solids
- Molecular substances don’t conduct
electricity – there are not ions so there’s no
electrical charge.
- The atom forms a very strong covalent
bond to form small molecules of several
atoms.
- Giant covalent Structure are
macromolecules
- These are similar to giant ionic
Structure (lattice)
- Except that there are
no charged ions
- Except that there are
no charged ions
- All the atoms are bonded to each other
by strong covalent bonds
- This means that they
have a very high melting
and boiling points
- This means that they
have a very high melting
and boiling points
- They don’t conduct electricity - not
even when molten (except for
graphite)
- The main example are diamond
and graphite as they are both
made only from carbon atoms and
silicon atoms (Silica)
- The main example are diamond
and graphite as they are both
made only from carbon atoms and
silicon atoms (Silica)
- Diamond
- Each carbon atom forms four
covalent bonds in a very rigid giant
structure
- Made of the hardest
natural substance
- Used for drill tips and it’s pretty and
sparkly too
- Used for drill tips and it’s pretty and
sparkly too
- Made of the hardest
natural substance
- Each carbon atom forms four
covalent bonds in a very rigid giant
structure
- Silicon Dioxide
(Silica)
- This is what sand made of -
each grain of sand is one giant
structure of silicon and oxygen.
- This is what sand made of -
each grain of sand is one giant
structure of silicon and oxygen.
- Graphite
- Each carbon atom only forms
three covalent bonds
- These creates layers which are free to slide other
each other (like a pack of cards) - Graphite is soft and
slippery
- This is because there are weak
intermolecular forces between the
layers
- Each carbon atom only forms
three covalent bonds
- These are similar to giant ionic
Structure (lattice)
Medienanhänge
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