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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
C5.1 USING THESE IDEAS (1)
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A and B are ‘snapshots’ of the same substance at two different temperatures: one shows the substance in the liquid state, the other in the gas state.
A
B
Try to use particle ideas to answer these questions:
Think for Yourself...
Which of A and B shows the sample above the boiling point of the substance?
Are the particles in A more energetic than the particles in B? Explain.
We can not usually see substances in the gas state. Are the individual particles in A different from those in B?
Is the ability of particles to hold onto each other weaker in A than in B?
Notes: see Teachers’ Guide
teachers’ guide c5
more info
c1: gas state
c2: boiling water
c3: boiling point
c4: gases
c5: using ideas
more info
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a Science Enhancement Programme CD-ROM 2005
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