Endothtermic And Exothermic Reaction Lab Report

801 Words4 Pages
Endothermic and Exothermic Reaction Aim: To observe exothermic and endothermic reactions. Method and Materials: As discussed in class. Baking Soda and Vinegar: 20ml bicarb soda 20ml vinegar 1. Measure temp of bicarb solution 2. Add vinegar 3. Measure temperature after reaction Baking soda and calcium chloride: 20ml baking soda 2 spatulas of calcium chloride 1. Measure temperature of bicarb solution 2. Add 2 spatulas of calcium chloride 3. Stir and measure temperature after reaction. Results: Table 1: Observations from reactions between baking soda and vinegar, and baking soda and calcium chloride. Starting Temperature Finishing Temperature Classification of reaction Observations Baking soda + vinegar 15oC 15oC Endothermic After…show more content…
In the exothermic reaction between the baking soda and calcium chloride, the finishing temperature was higher than the starting temperature as when the bonds of the reactants are broken, energy is released in the form of heat which causes an increase of temperature in the mixture. From looking at figure 2, it can be seen that the amount of stored chemical energy in this reaction decreased as the energy was released in the reaction. 3. Which reaction do you think caused the biggest change in energy to its surroundings? Give reasons to support your answer. The reaction that caused the biggest change in energy to its surroundings was the exothermic reaction between the baking soda and calcium chloride. This is because it can be seen from the results that this reaction caused a 5oC in temperature, where the other reaction made no temperature change. Evaluation: The results of this experiment are mostly reliable, however there are a few errors that could have occurred which would make the results unreliable. An error could have been that the bicarb solution was not at the correct temperature at the start of the experiment, meaning that the expected change of temperature wasn’t seen, which would affected the results as the reaction that occurred could be classified in the wrong way if the temperature change was incorrect. To minimise this in the future the experiment could be
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