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GCSE Biology · key term
The mass gained or lost, divided by the initial mass and multiplied by 100.
Used by AQA, Edexcel and OCR
Specification 4.1.3.2 · Paper 1
Revise: OsmosisPlot solution concentration on the horizontal axis and percentage change in mass on the vertical axis. Plot the results accurately and draw a suitable best-fit line or curve through the pattern. The illustrative graph shows the usual interpretation, not measured results from an experiment.
Specification 1.17 · Paper 1, Paper 2
The change in mass expressed as a proportion of the initial mass and multiplied by 100.
Label graph axes with both the quantity and its unit. Percentage change in mass has the unit %; concentration may be given in mol dm⁻³.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The change in mass divided by the starting mass, multiplied by 100; it is positive for a gain and negative for a loss.
Revise: Calculations and Graphs (Water Uptake)For example, to investigate how sucrose concentration affects potato mass, plot concentration on the horizontal axis and percentage change in mass on the vertical axis. Values above zero show mass gain; values below zero show mass loss. Describe the pattern shown by the plotted results rather than assuming every point lies exactly on a smooth line.