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Edexcel IGCSE Chemistry 3.10 Reversible reactions

Practise predicting how changes in temperature, concentration, pressure, surface area and catalysts alter rate graphs.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • draw curves with steeper or shallower gradients and correct final gas volume
  • interpret relationships between rate and temperature or concentration from graph data
  • explain competing changes,

3.10 Effects of factors on reaction rate question 1

[Maximum number: 1]

This question is about magnesium metal and its compounds.

A student uses this method to make a solution of magnesium chloride.

Step 1. measure 25 cm325 \mathrm{~cm}^{3} of dilute hydrochloric acid into a beaker
Step 2 add magnesium powder a little at a time
Step 3 keep adding magnesium powder until it is in excess
Step 4 remove the excess magnesium powder by filtration

This is the equation for the reaction.

Figure for Question 3.10 Effects of factors on reaction rate question 1 — Edexcel IGCSE Chemistry

Give a reason why the student uses magnesium powder rather than magnesium ribbon.

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