Edexcel IGCSE Chemistry Tangents and Rate of Change
Practise Edexcel IGCSE Chemistry tangents and rate of change by drawing tangents to curves and calculating reaction-rate gradients.
- Syllabus
- Issue 3 (2024)
- Course
- Chemistry 4CH1
Exam points
- Draw a tangent to a reaction curve at a stated time before calculating the gradient.
- Calculate rate of reaction from change in y divided by change in x on the tangent.
- Give correct rate units from the graph axes, such as cm³/s, cm³/minute, g/s or g/minute.
4E Tangents and rate of change question 1
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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