Chemistry - Covalent bonds
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10 Terms
what types of compounds can form covalent bonds
non-metals
covalent bonds can be simple molecular structures or what
giant covalent structures
what is the strong electrostatic attraction between
the negatively charged electrons and positively charged nuclei
why do simple molecular structures have low melting and boiling points
because the inter molecular forces are weak so less energy is needed to overcome them
why are simple molecular structures poor conductors
there are no delocalised electrons
why do giant covalent structures have a high melting and boiling point
the non-metal atoms are bonded together by strong covalent bonds, these structures can be called giant lattices
what are two examples of giant covalents
diamond and graphite
why is diamond a bad conductor
each carbon atom is bonded to four other carbon atoms therefore there are no delocalised electrons
graphite forms layers of what shape
hexagons
why is graphite a good conductor
because each carbon atom is bonded to only three other carbon atoms, leaving one electron free