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Find out what effects the change in energy in a chemical reaction.
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Exothermic and Endothermic coursework Aim To find out what effects the change in energy in a chemical reaction. Identifying Variables 1. Concentration 2. Mass/length of solid 3. Catalyst 4. Volume of liquid Hypothesis The variable I've chosen to study is the length of solid. The reaction I'm using is magnesium metal and hydrochloric acid. I think the temperature would increase if the length of ribbon is longer. It would increase because energy is given out when the reaction is taking place. The energy is from new bond being made. The heat exits the reactants. The magnesium bonds breaks as it reacts with the hydrochloric acid. The particles the join the hydrochloric acid's particles to make a new substances- magnesium chloride. The new formula is Mg + HCL --> MgCl + H2 Preliminary Evidence 4 cm ribbon 8 cm ribbon Start 19 19 Finnish 29 32 The preliminary evidence experiment shows that the temperature increases which makes it an exothermic reaction. This may be because the bonds produced...
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