1. Matter and Chemicals

    All substances matter and
    chemicals from a pin head to 
    a star are made of atoms. The atoms
    join or bond together to form molecules Atoms and molecules can separate and then join together in new combinations. This is chemical change. Matter exists in three main states solid liquids and gases.
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  2.  

    Science Discovery atom 1

  4. Since ancient times some scientific thinkers
    suspected that everything consisted of  the
    particles Democritus about 470 400 BC 
    of Ancient Greece suggested the world and everything in it were made of particles which were so small that they were invisible to our eyes He believed that these particles were unimaginably hard  lasted for ever and were always moving about. Parts of the modern theory of atom are similar to the ideas of Democritus    
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