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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
B4.2 REVIEWING IDEAS (2)
LINKS
Pictures P and Q show ‘snapshots’ of two different substances at the same temperature.
Think for Yourself...
Is P above its melting point? Is Q above its melting point? How do you know?
What is it about the particles that makes the liquid state ‘runny’ when the solid state is not?
P
Q
Notes: see Teachers’ Guide
teachers’ guide b6
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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