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AQA GCSE · Question 02.5 · Atomic structure and the periodic table
Estimate the density (X) of krypton.
Use your plotted graph and Table 1.
Estimate the density (X) of krypton.
Use your plotted graph and Table 1.
How to approach this question
1. Draw a smooth curve of best fit through the points you plotted on the graph.
2. Find the atomic number of Krypton from Table 1 (it is 36).
3. Locate 36 on the x-axis of your graph.
4. Draw a line up from 36 to your curve of best fit.
5. From that point on the curve, draw a horizontal line across to the y-axis.
6. Read the value from the y-axis. This is your estimate for the density of Krypton.
Full Answer
The points on the graph show a clear trend: as the atomic number increases, the density increases. By drawing a smooth curve of best fit through the plotted points, we can interpolate to find the value for krypton. Krypton has an atomic number of 36. Finding 36 on the x-axis and reading up to the curve, then across to the y-axis, gives a density value of approximately 3.2 mg/cm³. Any value within a reasonable range (e.g., 3.0 to 3.4) is acceptable as it depends on the exact curve drawn.
Common mistakes
✗ Just guessing a number without using the graph.
✗ Reading the value from the wrong axis.
✗ Drawing a poor line of best fit that does not follow the trend of the points.
Practice the full AQA GCSE Chemistry Higher Tier Paper 1
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