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*6193842897*
CHEMISTRY 0620/62
Paper 6 Alternative to Practical February/March 2020
1 hour
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units.
INFORMATION ● The total mark for this paper is 40. ● The number of marks for each question or part question is shown in brackets [ ].
2 A student investigated the time taken to collect 40 cm3 of hydrogen gas when magnesium reacts with dilute sulfuric acid.
Five experiments were done using the apparatus shown.
water
inverted 50 cm3
measuring cylinder
dilute sulfuric acidand distilled water
Experiment 1 ● Using a measuring cylinder, 8 cm3 of dilute sulfuric acid was poured into the boiling tube. ● Using a second measuring cylinder, 12 cm3 of distilled water was added to the acid in the
boiling tube. ● The apparatus was set up as shown in the diagram, ensuring the inverted measuring cylinder
was full of water. ● The bung was removed from the boiling tube. ● A coiled length of magnesium ribbon was added to the boiling tube, the bung was immediately
replaced and a timer started. ● The time taken for 40 cm3 of gas to be collected was measured. ● The student felt the outside of the boiling tube.
(a) (i) The student noticed that the boiling tube was warm.
What does this tell you about the type of reaction?
(ii) Describe one change that could be made to the apparatus to help keep the temperature of the contents of the boiling tube constant during the reaction.
Experiment 2 ● The boiling tube was rinsed out with distilled water. ● Experiment 1 was repeated using 10 cm3 of dilute sulfuric acid and 10 cm3 of distilled water.
Experiment 3 ● Experiment 2 was repeated using 12 cm3 of dilute sulfuric acid and 8 cm3 of distilled water.
Experiment 4 ● Experiment 2 was repeated using 16 cm3 of dilute sulfuric acid and 4 cm3 of distilled water.
Experiment 5 ● Experiment 2 was repeated using 20 cm3 of dilute sulfuric acid and no distilled water.
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