The rate of reaction between magnesium ribbon and dilute hydrochloric acid at room temperature is investigated.
The apparatus used is shown in Figure 1.
The volume of hydrogen gas given off was measured at regular intervals during the reaction.
Figure 1
The graph in Figure 2 shows the results of this experiment.
Figure 2
rate of reaction = .............................................. cm3 s-1
Higher Only
The balanced equation for this reaction is
Mg + 2HCl MgCl2 + H2
number of moles = .........................................
Two substances, A and B, each form a colourless solution.
If the solutions are mixed in a beaker, A and B react to form a coloured product.
The rate of the reaction between A and B can be investigated by placing the beaker containing the mixture on a cross on a piece of paper and timing how long it takes for enough coloured product to be produced to make the cross invisible when viewed from above, through the solution.
experiment 1 | experiment 2 | experiment 3 | |
concentration of A in solution in g dm-3 | 10 | 10 | 40 |
temperature in °C | 20 | 40 | 40 |
time for cross to become invisible in s |
320 | 80 | 20 |
Figure 3
Use the results of these experiments to explain, in terms of the behaviour of particles, the effect of changing temperature and the effect of changing the concentration of A in solution on the rate of this reaction.
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