Chemistry 5070/42 — October/November 2023
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Use of Techniques, Apparatus and Materials · Experimental Contexts · Qualitative Analysis · Planning Experiments and Investigations · Analysis, Conclusions and Evaluation
A student investigates the electrolysis of concentrated aqueous sodium chloride.
Fig. 1.1 shows the apparatus the student uses.
Name apparatus X.
______
Give a reason why iron electrodes are not used during this electrolysis.
______
Chlorine gas is produced at the anode during this electrolysis.
Describe and explain one safety precaution the student takes during this electrolysis.
safety precaution ______
explanation ______
A different gas is produced at the cathode during this electrolysis.
Name the gas produced.
Describe a test and its result to confirm the identity of the gas.
name of gas ______
description of test and result ______
The rest of this paper
3 more questions- Q2Experimental Contexts · Use of Techniques, Apparatus and Materials · Analysis, Conclusions and Evaluation · Planning Experiments and Investigations14M
- Q3Qualitative Analysis14M
- Q4Experimental Contexts · Planning Experiments and Investigations · Use of Techniques, Apparatus and Materials6M