Chemistry revision

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  • Chemistry Science
    • Element
      • A substance that cannot be broken down chemically
      • Hydrogen
      • copper
      • helium
    • Compound
      • A substance that contains at least two different elements , chemically combined in fixed proportions
      • Carbon dioxide gas (CO2) formed by combination of carbon and oxygen. ...
      • Alcohol (C6H5OH) is an organic compound composed of carbon, hydrogen and oxygen.


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