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TGM7:
Heating in air
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LINKS |
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Notes on the videos of magnesium and air and of copper
and air
Students should notice the following:
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The
magnesium reaction gives out a lot of energy; once started,
this reaction keeps going without any further ‘outside’
heat, leaving a white powder.
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The copper reaction
is much less energetic: there is no ‘glow’.
The metal powder simply turns black as it reacts with
oxygen.
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Both
chemical reactions produce a powder. Students already
know that the white powder formed as a result of the
magnesium-oxygen reaction is magnesium oxide: some students
should be able to suggest that the black powder is likely
to be copper oxide. They may also be able to provide
a word equation ,
that is, |
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Copper
+ oxygen --> copper oxide |
Students should be aware that, in each case, the reaction
must be using up some of the oxygen from the surrounding air,
but this is not something that would be obvious as it is not
a visible change.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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