Edexcel IGCSE Chemistry Graph Skills
Practise Edexcel IGCSE Chemistry graph skills by plotting reaction data, reading values from curves and calculating rates from tangents.
- Syllabus
- Issue 3 (2024)
- Course
- Chemistry 4CH1
Exam points
- Plot reaction data accurately and draw smooth best-fit curves, ignoring anomalous points where needed.
- Read values from graphs using guide lines, such as gas volume, time or reaction rate.
- Calculate rate of reaction from a tangent gradient and include correct rate units.
Covered syllabus points
4 Graphs question 1
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 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.
Question (a)
(a)
The table shows the student's results.
[ 4 ]
Question (i)
(i)
Plot the student's results on the grid.
[ 1 ]
Question (ii)
(ii)
Draw a curve of best fit.
[ 1 ]
Question (iii)
(iii)
Use your graph to determine the time taken for the mixture to turn blue at .
Show your working on the graph.
time taken = s
[ 2 ]
4 Graphs question 2
A student uses this apparatus to investigate the rate of reaction between dilute sulfuric acid and an excess of small pieces of zinc.
This is the student's method.
Step 1 use of dilute sulfuric acid
Step 2 add approximately 5 g of small zinc pieces to the sulfuric acid
Step 3 quickly connect the gas syringe
Step 4 record the reading on the gas syringe every 30 seconds until the reaction stops
The graph shows the volume of gas collected in the syringe during the experiment.
A tangent to the curve has been drawn at a time of 80 s .
Use the tangent to calculate the rate of reaction at 80 s .
Show your working on the graph.
Give the unit.
rate of reaction = unit
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