GCSE c4 OCR Contact process GCSE revision of The Contact Process 4.5 / 5 based on 2 ratings ? ChemistryHaber and industrial processesGCSEOCR Created by: harryCreated on: 01-04-13 16:27 What is the contact process used to make? Sulfuric acid 1 of 11 Describe the first stage Sulfur is burnt in oxygen to make sulfur dioxide 2 of 11 Describe the second stage The sulfur dioxide is oxidised to make sulfur trioxide 3 of 11 Describe the third stage Sulfur trioxide is dissolved in sulfuric acid then diluted in water 4 of 11 What are the 3 conditions that affect the second stage? Temperature, pressure and Catalyst 5 of 11 How does the temperature affect it? Decreasing the temperature would increase the yield (equilibrium moved to the right) but the rate of reaction would be reduced 6 of 11 What temperature is used? 450 degrees 7 of 11 How does pressure affect the reaction Increasing the pressure would move the equilibrium to the right but it is already to the right. 8 of 11 What pressure is used? Because increasing the pressure is expensive, 1 atmosphere is used 9 of 11 How does a catalyst affect the reaction It increases the rate of reaction 10 of 11 What type of catalyst is used? A vanadium pentoxide catalyst 11 of 11
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