8 SECTION B – Module C5 6
Trevor and Julie investigate the reaction between magnesium and hydrochloric acid at 20 °C. magnesium + hydrochloric acid
magnesium chloride + hydrogen
Look at the diagram. It shows the apparatus they use. 20 40 60 80 100 cm3
gas syringe hydrochloric acid magnesium ribbon
Look at the graph. It shows their results. 160
140
120
100 total volume of hydrogen in cm3
80
60
40
20
0 0
© OCR 2013
10
20
30 40 time in seconds
50
60