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TGM1:
Chemical change
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LINKS |
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Notes on ‘possibility of chemical change’
sequence
It is worth pausing to allow time for students to answer the
question before going on to the next page:
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Students should
be able to suggest that some collisions might be strong
enough to break the molecules apart. |
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Some
may also suggest that new particles might form.
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Pause again to allow time for students to answer the question
before going on to the next page:
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Students should
be able to suggest eventually there would be no original
molecules left, only new ones |
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Some
may also suggest that this would also mean there would
be new substances, and nothing left of the two original
substances. |
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Notes on chemical changes
It is difficult to tell much about the individual substances
from the appearance of the mixture:
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Two solutions could look the
same but the substances in the mixture might be very
different: ammonia in water and sugar in water, for
example. |
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A new substance ‘normally’
in the gas state would not be seen in the gas state
if it was soluble. |
Six questions on chemical change
These allow students to review some of the ideas on chemical
change, and could be used as quick plenary with
the whole class.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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