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5070/42

Chemistry 5070/42 — May/June 2016

Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme

9
questions
60
marks
60
minutes

Topics Experimental Contexts · Qualitative Analysis · Use of Techniques, Apparatus and Materials · Analysis, Conclusions and Evaluation · Observations and Measurements

Q110MUse of Techniques, Apparatus and MaterialsExperimental ContextsObservations and MeasurementsFree sample

A student separates hexane, C6H14\text{C}_6\text{H}_{14}, (b.p. 69∘C69^\circ\text{C}) and heptane, C7H16\text{C}_7\text{H}_{16}, (b.p. 98∘C98^\circ\text{C}) using the apparatus shown.

(a)

Identify two errors in the student's apparatus.

  1. ______
  2. ______
2M
(b)

The errors were then corrected and the separation started.

(i)

Name apparatus A.

______

1M
(ii)

What is the purpose of apparatus A?

______

1M
(iii)

Name apparatus B.

______

1M
(iv)

What is the purpose of apparatus B?

______

1M
(c)
(i)

What is the reading on the thermometer when the first few drops of liquid appear in C?

______

1M
(ii)

Name this liquid.

______

1M
(d)

Suggest which method should be used to heat the mixture and explain your choice.

method ______
explanation ______

2M

The rest of this paper

8 more questions
  • Q2Qualitative Analysis · Experimental Contexts10M
  • Q3Analysis, Conclusions and Evaluation · Experimental Contexts · Qualitative Analysis · Use of Techniques, Apparatus and Materials7M
  • Q4Experimental Contexts · Use of Techniques, Apparatus and Materials1M
  • Q5Experimental Contexts1M
  • Q6Experimental Contexts · Qualitative Analysis1M
  • Q7Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation13M
  • Q8Experimental Contexts · Qualitative Analysis7M
  • Q9Qualitative Analysis · Analysis, Conclusions and Evaluation10M
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