Heat a boiling tube of wax to a high temperature and as it cools note the temperature every minute Plot a graph of temperature against time Results Time min 1 2 3 4 5 6 7 8 9 Temp ID: 547406
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Slide1
Changes of state, the cooling curve and latent heatSlide2
Heat a boiling tube of wax to a high temperature and as it cools note the
temperature every minute.
Plot a graph of temperature against time.Slide3
Results
Time
(min)
1
2
3
4
5
6
7
8
9
Temp
(‘C)Slide4
Temperature versus Time graph
Time (minutes)Slide5
As the wax changes state from a liquid to a solid it gives out heat without cooling down. This heat is called latent heat because latent means ‘hidden’ and in this case it is not obvious where the heat is coming from.
Latent heat is therefore the heat taken in or given out when a substance is changing state (without changing temperature).Slide6