Chemistry 5070/42 — October/November 2016
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials · Qualitative Analysis · Observations and Measurements · Planning Experiments and Investigations
A student uses acidified aqueous potassium manganate(VII) to oxidise ethanol to ethanoic acid.
Name apparatus A.
______
What is the purpose of apparatus A?
______
Identify two errors in the student’s apparatus.
- ______
- ______
The errors are corrected before the student begins heating.
State why a Bunsen burner should not be used to heat the mixture of ethanol and potassium manganate(VII).
______
What should be used instead of a Bunsen burner?
______
Name the process that the student uses to separate ethanoic acid from the mixture after heating.
______
The ethanoic acid is heated with another sample of ethanol and a catalyst of sulfuric acid.
Name the organic product.
______
The rest of this paper
9 more questions- Q2Experimental Contexts · Qualitative Analysis10M
- Q3Analysis, Conclusions and Evaluation1M
- Q4Experimental Contexts1M
- Q5Experimental Contexts · Analysis, Conclusions and Evaluation1M
- Q6Analysis, Conclusions and Evaluation · Experimental Contexts1M
- Q7Planning Experiments and Investigations · Experimental Contexts5M
- Q8Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials · Observations and Measurements13M
- Q9Experimental Contexts · Qualitative Analysis11M
- Q10Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation9M