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Covalent Bonding
Between 2 or more NON METALS
They SHARE electrons to get FULL outer shells.
It forms a VERY STRONG covalent bond
Worksheet to try
http://sciencespot.net/Media/chbondcovalent.
pdf
Video lesson
http://www.bbc.co.uk/learningzone/clips/covalent-bonding-and-the-periodic-table/10667.
html
describe how covalent bonds are formed by electron
sharing and can result in the formation of simple
molecules or giant molecules such as those of like
diamond and graphite
draw dot and cross diagrams of simple molecules
including hydrogen (H2), hydrogen chloride (HCl),
water (H2O) and carbon dioxide (CO2)…read more

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http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/periodictable/covalentbondingrev2.
shtml
Properties of SIMPLE Molecules
Do not conduct
electricity as no
LO
charges
W
Bo
ilin
STRONG
g
Covalent bond
Po
STRONG
in
ts
Covalent bond
Although the covalent bond is strong the
molecules have each other. They do not need
anybody else. Thus the attractive forces
Lesson 16 -19 between the molecules is weak and thus easy
http://lgfl.skoool. to separate!
co.
uk/content/keysta
ge4/chemistry/pc/
lessons/uk_ks4_ STRONG
structures_and_b
onding/h-frame-
ie.htm
Covalent bond
describe and explain the
physical properties of
simple molecular covalent
STRONG substances including their
low melting/boiling points
Covalent bond and their inability to conduct
an electric current…read more

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Diamond has 4 covalent
Graphite has 3 covalent bonds and forms in layers.
bonds..no weak bonds thus Very strong but between layers a 4 weak bond made by
high melting point and hard delocalised electrons forms. This makes it easy to slip
and conduct electricity
http://www.teachersdomain.
org/resource/lsps07.sci.phys.matter.
covalentbond/
Lesson 20-21
http://lgfl.skoool.co.
describe and explain the similarities and differences in physical properties between the giant uk/content/keystage4/chemistry/
molecular covalent structures of diamond and graphite, including high melting/boiling points, pc/lessons/uk_ks4_structures_a
nd_bonding/h-frame-ie.htm
hardness and conductivity…read more

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Buckminsterfullerene is yet another allotrope of carbon. It is
actually not a giant covalent structure, but a giant molecule in
which the carbon atoms form pentagons and hexagons - in a
similar way to a leather football. It is used in lubricants
Uses and Nanotubes
http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/chemical/nanochemistryrev1.shtml
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/atomic/differentsubrev3.
shtml
Can Place Metal Ion inside Structure ­ make good catalysts and react with free radicals
which cause aging and cancer
Nanotubes are thin tubes made of rolled up graphite.
Upto 50 times as strong as steel and able to conduct
electricity ­ use in solar cells or microchips
http://www.plastemart.com/upload/Literature/Buckytube-fantastic-additive-for-polymer-composites.
asp
recognise the importance of chance in scientific discoveries such
as that of Buckminsterfullerene
recall that Buckminsterfullerene and carbon nanotubes are forms
of carbon
suggest uses for fullerenes and nanotubes, given data about http://www.docbrown.info/page03/nanochem04.htm
their properties…read more

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Lesson
23
http://lgfl.skoool.co.
uk/content/keystage4/che
mistry/pc/lessons/uk_ks4
_structures_and_bonding
/h-frame-ie.htm
Metal Atoms do not want their outer electrons so this leads to a
sea of unwanted electrons wandering around from atom to atom.
When a voltage is applied the electrons all flow to the negative
(conduct electricity).
This means they are good conductors of heat and the attaction
between the negative electrons and positive ions means a high
melting point
recall that metals conduct electricity
because there are relatively free
electrons in the giant structure of atoms http://www.docbrown.info/page04/4_72bond5.htm…read more

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