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Reaction of magnesium with sulphuric acid When energy in the form of heat is given out of a reaction it is an exothermic reaction. Exothermic reactions usually need activation energy, the energy to break the bonds in the chemicals and to start the reaction. Once the bonds are broken new stronger bonds are formed. In an exothermic reaction energy in the form so heat is given out to the surrounding when the products are formed. Therefore there is an average rise in temperature; energy is lost which results in a negative ?H. There are many variables which can be changed in some way to effect the reaction, some of which are listed below:- Volume of Sulphuric Acid Concentration of Sulphuric Acid Initial temperature of Sulphuric Acid Motion of liquid (speed of stirring) Amount and size of magnesium Purity of magnesium The extent of oxidation on the surface of the magnesium Addition of Catalysts Size of Container Temperature of surrounding environment Pressure at which...

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