This is an AS Chemistry lesson on calculating which chemical is in excess in a reaction. Also students calculate an enthalpy change using a graphical method for reactions that happen slowly and therefore heat is lost to the surroundings when recording the temperature rise. The graphical method involves estimating the actual temperature increase. There is opportunity to use hand warmers for the starter activity and reacting magnesium with oxygen (i.e. in air) as a main activity. Please rate this resource and leave feedback.
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