Chemistry 5070/42 — October/November 2010

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

questions

marks

minutes

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

Q18MUse of Techniques, Apparatus and MaterialsObservations and MeasurementsAnalysis, Conclusions and EvaluationExperimental ContextsQualitative AnalysisFree sample

The apparatus below contains $0.100\text{ mol / dm}^3$ sulfuric acid.

Fig. 1.1

(a)

(i)

Name the apparatus.

______

(ii)

What is the volume of $0.100\text{ mol / dm}^3$ sulfuric acid?

______ $\text{cm}^3$

(iii)

Using your answer to (a)(ii), calculate the number of moles of $0.100\text{ mol / dm}^3$ sulfuric acid.

______ moles

(b)

(i)

The sulfuric acid was poured into a beaker and $0.12\text{ g}$ of magnesium was added. The magnesium reacted with the sulfuric acid and hydrogen was produced.

How many moles of magnesium were added?
[ $A_r$ : Mg, 24]

______ moles

(ii)

Write the equation for the reaction between magnesium and sulfuric acid.

______

(iii)

Using your answers to (a)(iii), (b)(i) and (b)(ii), suggest which reagent was in excess, magnesium or sulfuric acid?
Explain your answer.

______

(c)

(i)

Give a positive test for hydrogen gas.

test ______
observation ______

(ii)

Calculate the volume of hydrogen gas produced in this reaction.
[ $1\text{ mol}$ of a gas measured at $25\,^\circ\text{C}$ occupies a volume of $24\text{ dm}^3$ .]

______ $\text{dm}^3$

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9 more questions

Q2Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials11M
Q3Experimental Contexts1M
Q4Experimental Contexts · Analysis, Conclusions and Evaluation1M
Q5Experimental Contexts1M
Q6Experimental Contexts1M
Q7Experimental Contexts1M
Q8Analysis, Conclusions and Evaluation · Experimental Contexts · Observations and Measurements15M
Q9Qualitative Analysis · Experimental Contexts10M
Q10Analysis, Conclusions and Evaluation · Experimental Contexts · Observations and Measurements · Planning Experiments and Investigations11M

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