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Plotting thermal decomposition data
A student investigated the thermal decomposition of copper carbonate.
| Mass of copper carbonate in test tube before heating in grams | Mass of the contents of test tube after heating in grams |
|---|---|
| 1.2 | 0.8 |
| 2.4 | 1.7 |
| 3.6 | 2.2 |
| 4.8 | 3.1 |
| 6.0 | 3.9 |
Plot the data from Table 1 on Figure 5. Draw a line of best fit.
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Marking points
- 1 Plots all five Table 1 points at the correct coordinates within the stated tolerance.
- 2 Draws a suitable line of best fit through the plotted pattern.
Full-mark answer
Plot the points (1.2, 0.8), (2.4, 1.7), (3.6, 2.2), (4.8, 3.1), and (6.0, 3.9), each within half a small square, then draw a straight line of best fit through the overall trend.
Why this answer loses marks
I joined each plotted point with straight line segments.
The points may be correct, but joined segments are not a suitable line of best fit through the overall pattern.