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TGM9:
Decomposition
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LINKS |
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Notes on the video showing the decomposition of copper
carbonate
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All
students should notice that the green powder turns black
and that the bag inflates. |
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Some
students may also notice that the green powder moves
as it is being heated and may connect this with the
idea of a new substance in the gas state being produced. |
Notes on the ‘Think for Yourself’ questions
Copper carbonate is similar to calcium carbonate. What atoms
is it made from?
Copper, carbon and oxygen.
What kind of structure will copper carbonate have?
A complex giant structure, similar
to calcium carbonate but with copper atoms in place of the
calcium atoms.
You have seen the black powder in a previous reaction: what
is it?
Copper oxide. (Students may
suggest that the black powder is carbon and you will need
to present the argument why it must be copper oxide: only
one other substance was formed, and the new substance in the
gas state can not be copper oxide).
What is the new substance in the bag most likely to be?
Carbon dioxide: it could be carbon
dioxide or oxygen as these are both gases at room temperature,
but if the
black powder is copper oxide, there must still be carbon atoms
in another new substance.
How could you test the gas to see if it was carbon dioxide?
Bubble it through limewater.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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