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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
K1.3 FILTER PAPERS
LINKS
We can use filtering to separate any mixture where a substance in the solid state is not dissolved.
A piece of filter paper has small gaps in it (between the fibres). These are big enough to be seen with a microscope.
Different qualities of paper have different sizes of gaps:
Notes: see Teachers’ Guide
Coarse filter paper (x200 )
Fine filter paper(x200)
teachers’ guide k1
more info
k1: filtering
k2: salt solution
k3: sample water
k4: water cycle
more info
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a Science Enhancement Programme CD-ROM 2005
user guide
