Edexcel IGCSE Chemistry Plot Two Variables

Practise Edexcel IGCSE Chemistry plotting two variables by placing data points accurately and drawing suitable best-fit curves.

Exam points

Plot all reaction data points accurately to the nearest grid line or half square.
Draw a smooth curve of best fit after plotting the two variables from the table.
Ignore an anomalous point when drawing a best-fit curve if the graph evidence supports it.

[Maximum number: 2]

A student investigates the effect of temperature on the rate of reaction between two solutions, A and B . When the reaction occurs, the mixture turns from colourless to blue.

This is the student's method.
- pour $25 \mathrm{~cm}^{3}$ of solution A into a conical flask
- add solution B and measure the temperature of the mixture
- record the time taken for the mixture to turn blue

The student repeats this method at different temperatures.

(a)

The table shows the student's results.

Table for Question (a) — Edexcel IGCSE Chemistry

[ 2 ]

(i)

Plot the student's results on the grid.

[ 1 ]

(ii)

Draw a curve of best fit.

Figure for Question (ii) — Edexcel IGCSE Chemistry

[ 1 ]

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4C Plot two variables question 1

Question (a)

Question (i)

Question (ii)