Endo/Exothermic Lab Essay

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Introduction An endothermic reaction is a chemical reaction accompanied by the absorption of heat. This means that a substance is absorbing the energy from its surroundings. An example of this is when an ice cube melts. An exothermic reaction is a chemical reaction accompanied by the evolution of heat. This can be described as a substance that produces energy to its surroundings. An example of an exothermic reaction could be when gas burns in an engine. In my lab I studied both endothermic and exothermic reactions. I did this by adding substances together to produce each reaction. I recorded the reactions using the Logger Pro computer program and a temperature probe. The first part of the experiment recorded an endothermic reaction by mixing 30.0 mL of citric acid and 10.0 g of solid baking soda. This produced a temperature change of -20 degrees Celsius. The second part of the experiment recorded an exothermic reaction by mixing 30.0 mL of HCI solution and a piece of magnesium coil. This produced a temperature change of 16.5 degrees Celsius. These different experiments demonstrated each reaction. I then had to print the graph made by Logger Pro. And finally proceeded to create a data table. Questions 1. Calculate the temperature change DeltaT, for each reaction by subtraction the initial temperature, T1, from the final temperature, T2 (DeltaT=T2-T1) (Reaction 1): T2=3.129 T1=23.8 (3.129-23.8=20.6) DeltaT=20.6 (Reaction 2): T2=41.0 T1=24.5 (41.0-24.5-16.5) DeltaT=16.5 2. Tell Which reaction is exothermic. Explain. The first reaction is exothermic because the final temperature is lower than the final temperature from the second reaction showing that it let out more energy to its surroundings. 3. Which reaction had a negative DeltaT value? Is the reaction

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