1a3 marks
A student investigated the reaction of zinc powder with dilute hydrochloric acid using the apparatus below.
The same mass of zinc was added to different volumes of hydrochloric acid at room temperature, 20 oC. The total volume of hydrogen gas given off in each experiment was measured.
Use the gas syringe diagrams to record the volumes of hydrogen gas in the table.
[3]
1b4 marks
On the grid, plot the points and draw a smooth line graph.
[4]
1c4 marks
i)
Which point is inaccurate?
[1]
ii)
Suggest a possible reason for this inaccurate measurement.
[1]
iii)
Use your graph to work out the volume that would be expected to be formed.
Show clearly on the grid how you got your answer.
[2]
1d2 marks
Explain why the volume of hydrogen gas does not increase after 30 cm3 of hydrochloric acid.
1e2 marks
Sketch on the grid the graph you would expect if the experiments were repeated using the same mass of zinc granules.
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