Graph

Graphs are drawn to show experimental data obtained during scientific experiments.

It is important to consider the following when drawing a graph:

  • The x-axis should be labelled (with the independent variable) and include appropriate units.
  • The y-axis should be labelled (with the dependent variable) and include appropriate units.
  • A suitable scale should be used that is even and results in the graph taking up at least half of the page.
  • The plots should be accurately plotted.
  • The plots should be joined with the appropriate straight line or curve.

Graphs are then used to identify trends present within the experimental data.

When forming a trend it is important to cover the entire graph.

Multiple trends in a graph should be individually described, using data as evidence.

Example

Practical B3: Investigating the effect of temperature on the action of an enzyme

As temperature increases from 0°C to 40°C, the time taken for starch digestion decreases.

As the temperature increases above 40°C, the time taken for starch digestion increases.

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