Physical properties in Covalent Compounds. Covalent discrete molecular substances ELEMENTS Hydrogen Oxygen Nitrogen Halogens Sulphur Phosphorus COMPOUNDS.

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Presentation on theme: "Physical properties in Covalent Compounds. Covalent discrete molecular substances ELEMENTS Hydrogen Oxygen Nitrogen Halogens Sulphur Phosphorus COMPOUNDS."— Presentation transcript:

1 Physical properties in Covalent Compounds

2 Covalent discrete molecular substances ELEMENTS Hydrogen Oxygen Nitrogen Halogens Sulphur Phosphorus COMPOUNDS Water Carbon dioxide Sulphur dioxide …millions of others

3 Melting/boiling points Covalent discrete molecular substances (elements and compounds) have high/low melting points. This is because they are made up of discrete molecules held together only by weak forces The molecules are separated using high/low energy NOTE: The covalent bonds are NOT broken

4 Conductivity Do not conduct in any state because there are no free moving charged particles (they are made up of atoms/molecules/ions which are neutral)

5 Covalent Networks substances ELEMENTS Boron Silicon Carbon (diamond or graphite) COMPOUNDS Silicon dioxide …a few others

6 Covalent network substances have high/low melting points. This is because they are made up of a huge network of atoms, all held together by covalent bonds which are very strong/weak. The atoms are separated using high/low energy NOTE: The covalent bonds ARE broken Melting/boiling points


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