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TGM6:
Magnesium and oxygen
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Notes on the video of magnesium and oxygen
Students should notice the following changes as evidence of
a reaction taking place:
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A fine white powder forms. This
is clearly a substance in the solid state, even though
it must be very hot.
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The reaction mixture glows white
hot.
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The bag of oxygen
deflates, indicating that the oxygen is being used up.
Some students may also be able to suggest that this
shows no other substance in the gas state are being
formed, or the bag would not stay deflated. |
Students should notice that, once again, the product in the
solid state is formed as a powder.
Notes on the ‘Think for Yourself’ questions
Magnesium is an elementary substance. It has a high melting
point. What kind of structure would you expect it to have?
A giant structure made from one kind
of atom.
What structure does oxygen have?
Small molecules, with each molecule
made from two of the same type of atom.
Magnesium oxide was still solid at a very high temperature:
what structure is it likely to have?
A giant structure.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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