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Teachers’ Guide
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Substances
A1 Melting/Freezing
B1 The particle theory
C1 The gas state
D1 The three states
E1 Density
Mixtures
F1 Melting behaviour
G1 Evaporation of water
H1 Condensation of water
I1 Recognising dissolving
J1 Solubility
K1 Separating mixtures
Changing substances
L1 Structures
M1 Chemical change
Advanced substances
N1 Crystals
O1 Change of state
P1 Gas and pressure
Advanced mixtures
Q1 Diffusion
R1 Rate of evaporation
S1 Rate of dissolving
T1 Chromatography
Advanced changes
U1 Formulae
V1 Fire
W1 Acids
B2.2 EXPLAINING MELTING: A REVIEW OF IDEAS
LINKS
Use the ideas of the particle theory to answer the questions on the right:
Click
here
to see the ideas of the particle theory again.
Think for Yourself...
•
How do the animations you have seen show that the wax is in the solid state?
•
Why do the particles behave like this?
•
What happens to the particles if a lump of wax is heated from 20ºC to 50ºC?
•
What happens to the particles when the wax is heated to its melting point?
Notes: see Teachers’ Guide
teachers’ guide b3
more info
b1: particle theory
b2: melting
b3: melting points
b4: using ideas
more info
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a Science Enhancement Programme CD-ROM 2005
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