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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
M6.6 WHAT? NO MELTING POINT?
LINKS
Most substances can exist in any of the three states, but not all.
Like copper carbonate, some
decompose before they melt
so they only exist in the
solid state
.
Some substances
decompose before boiling
, so they exist only in the
solid and liquid states
.
Melting and boiling points are very useful ways of
identifying a sample of a substance
but they are not the only way:
We can also use a
specific chemical reaction
(as we did to test for carbon dioxide, for example).
not applicable
more info
m1: changing
m2: mixing reaction
m3: calcium water
m4: heating reaction
m5: in solution
m6: decomposition
m7: crystallisation
more info
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a Science Enhancement Programme CD-ROM 2005
user guide
