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5070/41

Chemistry 5070/41 — October/November 2013

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

10
questions
60
marks
60
minutes

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

Q17MUse of Techniques, Apparatus and MaterialsExperimental ContextsAnalysis, Conclusions and EvaluationQualitative AnalysisFree sample

A student adds a known mass of magnesium ribbon to 100 cm3100\text{ cm}^3 of dilute hydrochloric acid (an excess) in the apparatus shown below. Hydrogen gas is evolved. The time taken to collect 48 cm348\text{ cm}^3 of gas at room temperature and pressure is measured.

(a)
(i)

Name apparatus A.

______

1M
(ii)

Name apparatus B.

______

1M
(b)
(i)

Calculate the number of moles of hydrogen in the 48 cm348\text{ cm}^3 of gas.

[1 mole1\text{ mole} of any gas occupies 24 000 cm324\,000\text{ cm}^3 at room temperature and pressure.]

______ moles

1M
(ii)

Use the equation below to deduce the mass of magnesium used in the experiment to produce 48 cm348\text{ cm}^3 of hydrogen at room temperature and pressure.

[ArA_r: Mg, 24]

Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2

______ g\text{g}

1M
(c)

Give a test for hydrogen gas.

______

1M
(d)

What is the effect on the time taken to collect the same volume of gas if,

(i)

large lumps of the same mass of magnesium are used instead of magnesium ribbon,

______

1M
(ii)

the reaction is carried out at a higher temperature?

______

1M

The rest of this paper

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  • Q8Experimental Contexts · Use of Techniques, Apparatus and Materials · Observations and Measurements · Analysis, Conclusions and Evaluation12M
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  • Q10Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation10M
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