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The diagram shows a catalytic converter used in car exhaust systems - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Question 3
The diagram shows a catalytic converter used in car exhaust systems. Gases from the car engine pass into the catalytic converter. In the catalytic converter, carbon ... show full transcript
Worked Solution & Example Answer:The diagram shows a catalytic converter used in car exhaust systems - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Step 1
What type of reaction occurs in the catalytic converter?
Answer
The reaction occurring in the catalytic converter is oxidation. In this process, carbon monoxide (CO) reacts with oxygen (O₂) to form carbon dioxide (CO₂), while unburnt hydrocarbons also undergo oxidation to become carbon dioxide and water vapor.
Step 2
Explain why the catalyst is spread onto the honeycomb structure rather than used as large pieces.
Answer
The catalyst is spread onto the honeycomb structure to increase the surface area available for reactions. A greater surface area allows more reactants to come into contact with the catalyst simultaneously, thereby enhancing the rate of reaction. If large pieces were used, the limited surface area would slow down the reaction rate, making the catalytic converter less efficient.