Medium2 marksStructured
The rate and extent of chemical changeFoundationgraphingdata analysisrates of reaction

AQA GCSE · Question 07.4 · The rate and extent of chemical change

Figure 6: Reaction Progress Mean volume of gas collected in cm³ 0 10 20 30 40 50 60 70 80 90 100 110 Time in seconds 0 20 40 60 80 100 120 140 160 180

Plot the data from Table 5 on Figure 6. You should include your answer to Question 07.3. You do not need to draw a line of best fit.

How to approach this question

1. Use the "Mean" column from Table 5 for the y-values and the "Time in seconds" column for the x-values. 2. For the point at 40 seconds, use your calculated mean value, X = 47. 3. For each pair of values (Time, Mean Volume), find the correct position on the graph. - (0, 0) - (40, 47): Go to 40 on the x-axis, then up to 47 on the y-axis (just below the 50 line). - (80, 82): Go to 80 on the x-axis, then up to 82 on the y-axis. - (120, 96): Go to 120 on the x-axis, then up to 96 on the y-axis. - (160, 100): Go to 160 on the x-axis, then up to 100 on the y-axis. 4. Mark each point clearly with a small cross or a circled dot.

Full Answer

The points should be plotted at: (0, 0), (40, 47), (80, 82), (120, 96), (160, 100).
The data to be plotted are the mean values against time. The coordinates are (Time, Mean Volume). From Table 5 (and using X=47 from Q07.3): - (0, 0) - (40, 47) - (80, 82) - (120, 96) - (160, 100) Each point should be located accurately on the grid. The y-axis scale has major lines every 10 units, with 5 small squares in between, so each small square represents 2 units. The x-axis scale has major lines every 20 units, with 10 small squares in between, so each small square represents 2 units.

Common mistakes

✗ Plotting individual test results instead of the mean. ✗ Using the anomalous result for the point at 40 seconds. ✗ Misreading the scales on the axes. ✗ Swapping the axes (plotting time on y-axis and volume on x-axis).

Practice the full AQA GCSE Chemistry Foundation Tier Paper 2

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