Chemistry 5070/41 — May/June 2023
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation · Planning Experiments and Investigations · Use of Techniques, Apparatus and Materials · Qualitative Analysis
A student uses chromatography to separate the dyes in a food colouring.
Fig. 1.1 shows the apparatus the student uses.
Name apparatus X.
______
State why it is important to have a lid on X.
______
State why the start line is:
- above the level of the solvent
- drawn in pencil.
above the level of the solvent ______
drawn in pencil ______
The value of one of the dyes in the food colouring is 0.60.
In the separation this dye travels .
Calculate the distance travelled by the solvent during the separation.
distance travelled by solvent = ______
The rest of this paper
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