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Chemguide Support for Edexcel IGCSE Chemistry |
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Extra material needed for the 2010 exam - Chapter 14 This page lists the material from the old Edexcel syllabus which isn't covered by my new Edexcel IGCSE Chemistry book. The principle of conservation of energy This says that energy can't be created or destroyed in a chemical change. It is simply converted from one form into another. And that's it really! Enthalpy change The old syllabus requires that students should be able to explain the term "enthalpy change". "Enthalpy change" is the formal term for the heat evolved or absorbed during a chemical change. Throughout the new book, I have avoided using the term, preferring the more understandable "heat evolved or absorbed" instead. As a matter of interest, I searched back through all the past papers from May 2005 to May 2008 (which includes November papers as well as May papers), and the term never crops up either in the theory papers or the practically-based papers. In fact, Edexcel often incorrectly use the term "energy change" when enthalpy change would have been appropriate. Return to complete list of extras © Jim Clark 2009 |