Chemistry Test

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  • Created by: Mols
  • Created on: 29-10-12 18:15

Describe the formation of a covalent bond by the sharing of a pair of electrons between two atoms

·         understand covalent bonding as a strong attraction between the bonding pair of electrons and the nuclei of the atoms involved in the bond

·         explain, using dot and cross diagrams, the formation of covalent compounds by electron sharing for the following substances: i hydrogen ii chlorine iii hydrogen chloride iv water v methane vi ammonia vii oxygen viii nitrogen ix carbon dioxide x ethane xi ethene.

hydrogen

h2_venn.gif

chlorine

same as hydrogen but six more on outer shells

hydroge chloriede

diag_hyd_chloride.gif

water

diag_water.gif

methane

diag_methane.gif

ammonia

diag_ammonia.gif

carbon dioxide

gcsechem_111.gif

ethane

Ethane-Molecule.gif

ethene

ethene_venn.gif

·         recall that substances with simple molecular structures are gases or liquids, or solids with low melting points

·         explain why substances with simple molecular structures have low melting points in terms of the relatively…

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