Structure and Properties Glossary
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Compound | A substance made when two or more elements are chemically bonded together.
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Covalent Bond | The attraction between two atoms that share one, or more pairs of electrons.
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Covalent Bonding | The attraction between two atoms that share one, or more pairs of electrons.
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Delocalised Electron | bonding electron that is no longer associated with any one particular atom.
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Dot and Cross Diagram | a drawing to show the arrangement of the outermost electrons only of the atoms or ions in substance.
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Double Bond | a covalent bond formed by the sharing of two pairs of electrons.
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Giant Covalent Structure | a huge 3D network of covalently bonded atoms. (e.g. the giant lattice of carbon atoms in diamond or graphite.
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Giant Lattice | a huge 3D network of atoms or ions (e.g. the giant ionic lattice in sodium chloride).
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Ion | a charged particle produced by the loss or gain of electrons.
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Ionic Bond | the electrostatic force of attraction between positively and negatively charged ions.
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Ionic Bonding | the electrostatic force of attraction between positively and negatively charged ions.
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Mixture | when some elements or compounds are mixed together and intermingle but do not react together ( i.e. no new substances are made). A mixture is NOT a pure substance.
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Macromolecule | Giant covalent structure.
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Monomers | Small reactive molecules that react together in repeating sequences to form a very large molecule (a polymer).
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Nanoscience | The study of very tiny particles or structures between 1 and 100 nanometres in size- where 1 nanometre = 1x10-9metres
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Polymer | A substance made from very large molecules made of many repeating units e.g. poly(ethene).
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Polymerisation | The reaction of monomers to make a polymer.
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