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User guide
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
B1.1 THE PARTICLE THEORY
LINKS
We are going to use a set of ideas to explain
melting and freezing:
A sample of a substance is a collection of particles.
There is nothing else except the particles.
The particles of one substance are all the same.
The particles hold on to each other – the ‘holding power’ is different for different substances.
The particles are always moving in some way –they have an energy of movement.
Heating gives the particles more energy of movement – they are more energetic.
We call this set of ideas
‘the particle theory’.
Notes: see Teachers’ Guide
teachers’ guide b1
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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