 
          protein
        
        
          one of the
        
        
          substances that forms part
        
        
          of living things. Protein
        
        
          consists of nitrogen,
        
        
          carbon, hydrogen, and
        
        
          oxygen combined
        
        
          together.
        
        
          react
        
        
          to change
        
        
          chemically. When two
        
        
          substances react they
        
        
          change into different
        
        
          substances.
        
        
          terminal
        
        
          a piece of
        
        
          metal that joins a battery
        
        
          to an electrical circuit.
        
        
          zinc
        
        
          a metal.
        
        
          Websites
        
        
          
            chemistry.about.com/cs/howtos/ht/buildavolcano.htm
          
        
        
          This website tells you how to use the reaction between vinegar
        
        
          (or lemon juice) and baking soda to make an active volcano.
        
        
        
          Ideas for experiments in which you can use litmus paper to
        
        
          measure the acidity of different fruits and other food.
        
        
          
            Note to parents and teachers: The publisher has made every effort to ensure that
          
        
        
          
            these websites are suitable for children. However, due to the nature of the Internet,
          
        
        
          
            we strongly advise the supervision of web access by a responsible adult.
          
        
        
          Books
        
        
          
            The Kid’s Book of Simple Everyday Science by Kelly Doudna
          
        
        
          , Scarletta Publishing,
        
        
          2013
        
        
          
            Slimy Science and Awesome Experiments by Susan Martineau and Martin Ursell
          
        
        
          ,
        
        
          b small publishing, 2014
        
        
          
            Think Like a Scientist in the Kitchen (Science Explorer Junior) by Matt Mullins
          
        
        
          ,
        
        
          Cherry Lake Publishing, 2011
        
        
          F
        
        
          u
        
        
          r
        
        
          t
        
        
          h
        
        
          e
        
        
          r
        
        
          i
        
        
          n
        
        
          f
        
        
          o
        
        
          r
        
        
          m
        
        
          a
        
        
          t
        
        
          i
        
        
          o
        
        
          n
        
        
          29