Experimental Testchnique Test Marking Scheme
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Sec 3 Express: Experimental Technique MARKING SCHEME Section A: Q1 Q2 Q3 Q4 Q5
A B A B B
Section B: Q1
a) To ensure that the colourless spots are made visible b) No. electrode A shows 3 spots while electrode B shows 4 spots c) Tin, copper, lead d) at 9
e) Rf = 3/12 = 0.25 Q2
[1m] [1m,1m] [1m] [1m]
[1m]
Draw diagrams for the following steps:
1) dissolution Add exess CuO to H2SO4 2) filtration 3) Evaporate till get saturated solution by dipping clean dry glass rod to check. 4) crystallisation
[1m] [1m] [1/2m, 1/2m] [1m]
A B A B B
Section B: Q1
a) To ensure that the colourless spots are made visible b) No. electrode A shows 3 spots while electrode B shows 4 spots c) Tin, copper, lead d) at 9
e) Rf = 3/12 = 0.25 Q2
[1m] [1m,1m] [1m] [1m]
[1m]
Draw diagrams for the following steps:
1) dissolution Add exess CuO to H2SO4 2) filtration 3) Evaporate till get saturated solution by dipping clean dry glass rod to check. 4) crystallisation
[1m] [1m] [1/2m, 1/2m] [1m]
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