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nature of matter and experimental techniques (Selina ) (measurement…
nature of matter and experimental techniques (Selina )
diffusion
check on mind map (cells)
measurement
temperature
thermometer
volume
measuring cylinder
time
clock
mass
balance
pipette
it can suck liquid into it.(吸管）
burette
the apparatus used in filtration. (a tube)
methods of purification
methods of separation and purification: filtration, crystallisation, distillation, fractional distillation and paper chromatography
seperation: filtration, conical flask is needed.
purification: fractional distillation, burette is needed.
criteria of purity
chromatography
put a paper with a dot of paint in the water and the water will be eaten by the paper and the colour included in the drop of paint will be separated as the water goes up.
Rf
in the manufacture of compounds to use in drugs and food additives
importance of purity in substances for use in everyday life
mixtures melt and boil over a range of temperatures
mixture have higher boiling and lower melting point than a pure substance
three states and change of states
molecule
ion
atom
change of state
evaporation
freezing
boiling
condensation
melting