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Elements_ Compounds _ Mixtures

VIEWS: 5 PAGES: 8

									D. Crowley, 2007
   To be able to recognise elements, compounds and
    mixtures
   Remember, elements and compounds can be represented
    using formula

   The number represents the ratio of atoms present

   The small number always represents the number of atoms for
    the element to the left of it

   Finally, elements always begin with a CAPITAL (but they may
    have two or three small letters after them too)!
                             CO2
      1 x C (carbon); 2 x O (oxygen) = carbon dioxide

                             NaCl
      1 x Na (sodium); 1 x Cl (chlorine) = sodium chloride

                               CaCO3
1 x Ca (calcium); 1 x C (carbon); 3 x O (oxygen) = calcium carbonate

                            C6H12O6
  6 x C (carbon); 12 x H (hydrogen); 6 x O (oxygen) = glucose
   Using the worksheet, complete the missing blanks

   Once you have done this, complete the second task

   This is timed - you have fifteen minutes! If you have
    completed this, ensure all your work is stuck in!
   Rust is formed when iron objects are left out in the air. The iron reacts with the oxygen
    in the air, forming iron oxide. Rust be can turned back into iron, by mixing it with
    carbon and heating it. I think rust is _______________ (an element / a mixture / a
    compound) because…

   There are a number of different gases in the air. The main ones are nitrogen and
    oxygen, but there are also small amounts of argon, carbon dioxide and water vapour. I
    think air is _______________ (an element / a mixture / a compound) because…

   Helium is a gas. There are tiny amounts of helium in the air. Helium does not burn, and
    will not react with any other chemicals. It cannot be split up by chemical reactions. It
    think helium is _______________ (an element / a mixture / a compound) because…

   Evaporating salty water results in common salt being left behind. This salt is called
    sodium chloride, and is made up of two elements, sodium (Na) and chlorine (Cl). I think
    salt is _______________ (an element / a mixture / a compound) because…
   Rust is formed when iron objects are left out in the air. The iron reacts with the
    oxygen in the air, forming iron oxide. Rust be can turned back into iron, by mixing
    it with carbon and heating it. I think rust is a compound because it has iron and
    oxygen which are chemically bound. The iron oxide has new properties too

   There are a number of different gases in the air. The main ones are nitrogen and
    oxygen, but there are also small amounts of argon, carbon dioxide and water
    vapour. I think air is a mixture because it has a variety of elements which make it
    up, which are not chemically bound (it also has some compounds which make up
    the mixture)

   Helium is a gas. There are tiny amounts of helium in the air. Helium does not burn,
    and will not react with any other chemicals. It cannot be split up by chemical
    reactions. It think helium is an element because it is made up of just one type of
    atom, and cannot be split into anything smaller

   Evaporating salty water results in common salt being left behind. This salt is called
    sodium chloride, and is made up of two elements, sodium (Na) and chlorine (Cl). I
    think salt is a compound because the sodium and chlorine are chemically bound.
    They also have new properties (so different in fact that NaCl is edible (table salt))
    whilst the elements which make up this compound are not safe to injest
   In small groups your final task is to make a suitable
    poster (in aid of revision) to help us distinguish between
    elements, compounds and mixtures.
   You may wish to define the three; show particle models
    and give examples
   Make it colourful, easy to read and informative…




             Element   Element    Compound      Mixture      Mixture


                                       Remember: an element is made up of just one type of atom

                       A compound is two or more elements which are chemically bound together…

                       A mixture is made from different substances which are not chemically bound

								
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