Properties, Uses & Alloys of Metals (Cambridge (CIE) IGCSE Chemistry)

Exam Questions

3 hours32 questions
1a5 marks

A student investigated the temperature change produced when equal lengths of magnesium ribbon reacted with excess dilute sulfuric acid of different concentrations (labelled solutions A, B, C, D and E).

Five experiments were carried out.

Experiment 1

Using a measuring cylinder, 20 cm3 of sulfuric acid solution A was poured into a beaker. The initial temperature of the solution was measured. A length of magnesium ribbon was added to the solution and stirred. The highest temperature reached was measured.

Experiment 2

Experiment 1 was repeated using solution B instead of solution A. The initial and highest temperatures were measured as before.

Experiment 3

Experiment 1 was repeated using solution C. The initial and highest temperatures were measured.

Experiment 4

Experiment 1 was repeated using solution D. The initial and highest temperatures were measured.

Experiment 5

Experiment 1 was repeated using solution E. The initial and highest temperatures were measured.

Use the thermometer diagrams in the table, to record the initial and highest temperatures in each experiment.

 

solution of sulfuric acid

thermometer diagram

initial temperature / oC

thermometer diagram

highest temperature / oC

change in temperature / oC

A

thermometer-reading-7

 

thermometer-reading-39c-2

 

 

B

thermometer-reading-26c

 

thermometer-reading-37c

 

 

C

thermometer-reading-25c

 

thermometer-reading-35c

 

 

D

thermometer-reading-7

 

thermometer-reading-31c

 

 

E

thermometer-reading-26c

 

thermometer-reading-29c

 

 

  Work out the temperature change for each experiment and record the values in the table.

1b4 marks

Draw a labelled bar chart of the results for Experiments 1, 2, 3, 4 and 5 on the grid below. 

temp-change-bar-chart-blank
1c1 mark

Use the results and observations to answer the following questions.

What type of chemical reaction occurs when magnesium reacts with dilute sulfuric acid?

1d2 marks

i) Which Experiment produced the largest temperature change?

 [1]

 ii) Suggest why this Experiment produced the largest temperature change.

 [1]

1e3 marks

Predict the effect on the temperature changes that would happen if

 i) equal masses of magnesium powder were used in the Experiments.

 [1]

 ii) 40cm3 of dilute sulfuric acid was used in Experiment 1.

 [1]

 iii) Explain your answer to (e)(ii).

 [1]

1f1 mark

Give one possible source of experimental error in this investigation.

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