Covalent structures: Elements compounds and mixtures: Chemistry: (9:1)

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12 Terms

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Covalent bond

A shared pair of electrons

<p>A shared pair of electrons</p>
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Molecule

A group of two or more atoms held together by covalent bonds

<p>A group of two or more atoms held together by covalent bonds</p>
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Examples of simple molecular substances

CO2, H2O, NH3

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Polymer

A long molecule consisting of many similar or identical monomers linked together.

<p>A long molecule consisting of many similar or identical monomers linked together.</p>
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Examples of giant covalent structures

Diamond, graphite, silicon dioxide

<p>Diamond, graphite, silicon dioxide</p>
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Limitations of dot and cross diagrams

Do not show the 3D shape of a molecule

<p>Do not show the 3D shape of a molecule</p>
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Limitations of ball and stick diagrams

Bonds appear longer than they really are

<p>Bonds appear longer than they really are</p>
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Giant covalent structure

A huge 3D network of covalently bonded atoms

<p>A huge 3D network of covalently bonded atoms</p>
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Monomer

A small compound whose molecules can join together to form polymers

<p>A small compound whose molecules can join together to form polymers</p>
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Double covalent bond

A bond in which two atoms share two pairs of electrons

<p>A bond in which two atoms share two pairs of electrons</p>
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Triple covalent bond

A bond formed by sharing three pairs of electrons

<p>A bond formed by sharing three pairs of electrons</p>
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No of atoms in a polymer chain

Thousands