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giant, simple and lattice structures

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jess maunder

on 6 May 2010

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Transcript of giant, simple and lattice structures

Giant & simple structures & nanoparticles
GIANT Giant covalent structures contain a lot of non-metal atoms, each joined to adjacent atoms by covalent bonds. The atoms are usually arranged into giant regular lattices - extremely strong structures because of the many bonds involved. properties of giant covalent structures giant covalent structures have very high melting points

e.g graphite - 3,600 degrees.

variable conductivity - Diamond does not conduct electricity. Graphite contains free electrons, so it does conduct electricity. here are some covalent structures of..... DIAMOND Diamond is a form of carbon in which each carbon atom is joined to four other carbon atoms, forming a giant covalent structure.

Diamond is very hard and has a high melting point.

It does not conduct electricity. GRAPHITE and..... Graphite is a form of carbon in which the carbon atoms form layers.

The layers can slide over each other, so graphite is much softer than diamond.

Graphite conducts electricity.
and.... SILICA Silica has a similar structure to diamond.

It is hard and has a high melting point.

it contains silicon and oxygen atoms, instead of carbon atoms.
SIMPLE They do not conduct electricity... simple covalent structures includINg H2O
are simply made up of a few atoms joined together. as they don't have many atoms they cannot
extend like giant structures. giant structures are formed from ionic compounds.
ionic compounds can conduct electricity when they are molten or dissolved, but not when they are solids. NANO PARTICLES Nanoparticles show different properties to the same materials in bulk and have a high surface area to volume ratio This may lead to... development of new computers, new catalysts, new coatings, highly selective sensors and stronger and lighter construction materials. this is the simplest carbon structure that is being researched through Nanoscience. Buckminsterfullerene Generally nanotechnology deals with structures of the size 100 nanometers or smaller in at least one dimension, and involves developing materials or devices within that size. THANKYOU FOR WATCHING OUR PRESENTATION BY JESS, ELLIE AND EMILY
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