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Edexcel IGCSE Chemistry 3.10 Reversible reactions

Edexcel IGCSE Chemistry 3.10 Reversible reactions
Edexcel IGCSE Chemistry syllabusChemistry 4CH1First assessment 2019

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

How this is tested

  • 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,

Question 3(c)(i)

[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.

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