Pleased with this - enjoy! Excellent - worthy of high grade OXFORD AND CAMBRIDGE SCHOOLS EXAMINATION BOARD. General Certificate Examination - Advanced Level Chemistry (Salters') - Paper 3 mock. ROBERT TAYLOR U6JW. THE ROLE CATALYSTS IN CHEMICAL REACTIONS, THEIR IMPORTANCE IN INDUSTRY, PROBLEMS AND NEW DEVELOPMENTS.         A Catalyst is a substance that alters the rate of a reaction. The catalyst remains unchanged at the end of the reaction. The process is called catalysis. In this …showed first 75 words of 1089 total…

…showed last 75 words of 1089 total…of activity can be achieved but the catalyst can be removed easily from the reaction mixture and re-used. I personally therefore feel that the future of environmentally friendly catalysis lies with supported reagent catalysts. WORD COUNT = 998          NB: Athough this essay is headed as being a mock exam it was never assessed by an examining board, only my chemistry teacher so there is no chance of an examining board also having a copy. Rob Taylor 25/11/1996. ~:o)