227
Freezing
Icicles are spikes of ice
that form when dripping
water freezes. You often
see them on trees in
winter. If water keeps
dripping down and
freezing, the icicle will
get longer and longer.
Changing states
Melting
chocolateBecause the warmth of your mouth makes it melt.
Melting
When you don’t eat your
ice cream quickly enough,
it melts and changes from a
solid to a liquid! Chocolate
melts too, and makes
your hands all sticky.
Most solids will melt if the
temperature is high enough.Evaporating
In the open air, water slowly turns into
vapour – this is called evaporation.
Wet clothes dry on a line because the
water they hold evaporates.Washing dries faster on a hot day,
when heat turns water into vapour
very quickly.M
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230-231 Molecules
232-233 Reactions
and changes