We have been learning which
is occurring in our investigations.
is occurring in our investigations.
We learnt that...
A physical change is reversible (for example, the freezing of water) and no new substance is formed.
**Reversible means that the reaction/change can be reversed
and that...
A chemical change is irreversible (for example, the burning of wood is a chemical change - you can't 'unburn' it) and it results in the formation of one or more new substances; ash, carbon dioxide, etc.
**Irreversible means that it is impossible to reverse the reaction/change.
and also that...
A 'fair test' is one in which you only change one thing (variable).
Variables are all the things that could change during an investigation.
Go to this link to play a game about Fair Testing.
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