Properties%20of%20Covalent%20Compounds

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Properties of Covalent Compounds

• Mrs. CoyleContemporary Chemistry

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Do you remember what are covalent compounds?

• They are compounds made up of non metals.
• They form molecules and are also called molecular
  compounds.
• Their atoms are bonded by covalent bonds.

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What are examples of common covalent compounds?

• Water
• Carbon Dioxide
• Wax (paraffin)
• Plastics
• Methane
• Propane

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Properties of Covalent Compounds
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Solubility

• Usually do not dissolve in water and therefore
  are not electrolytes.

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Melting Points

• Usually low compared to ionic compounds.

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Hardness

• Usually have low hardness and sometimes can be
  elastic (ex. rubber).

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Electrical Conductivity

• They are not good conductors of electricity.

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How does the submicroscopic structure of covalent
compounds explain their macroscopic properties?

• The interparticle forces between molecules (Van
  der Waals) are weak forces.

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Ionic Compounds Molecular Compounds
Crystal Lattice Molecule
Types of Elements Metal with non-metal or polyatomic ions Non-metal with non-metal
Physical State Solid Solid, liquid or gas
Melting Point High gt 300 ?C Low lt300 ?C
Solubility in water Generally high Generally low
Electrical conductivity of solution Good conductors Poor to none