Chapter 8.docx - Experiment No 1 Calorimetry Chemistry 1412...

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Experiment No. 1 Calorimetry Chemistry 1412 – General Chemistry 2 South Texas College Spring 2019 For: S. Palmer By: Izak Lozano Objective: A of heat that flows simple coffee-cup calorimeter will determine the quantity of heat that flows in several physical and chemical process.
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Materials: Coffee cup Thermometer Cold water Heat plate Beakers Test Tube Nickel NaOH HCl Procedures: Choice 1. Obtain a plastic lid that tightly fits the coffee cup using the paper punch make a whole in the lid where the stirring rod fits. With a graduated cylinder place 75 mL of cold water into the calorimeter. Measure 75 mL of water and heat it to about 70-80 degree Celsius. When the water being heated has reached 70 to 80°C use hot hands to move to the coffee cup. Quickly remove the lid from the calorimeter and pour the hot water into the cold water. Stir for 30 seconds . Record the highest temperature reached by the water in the calorimeter. Choice 2. Use the same calorimeter assembly from choice 1. With a graduated cylinder place 75 mL of cold water into the calorimeter. Heat up a 600 mL beaker for the water to boil. Transfer the unknown metal, nickel, to a test tube and heat up the tube in the boiling water for at least 10 minutes to allow the metal to reach the temperature of boiling water. After the metal is done boiling, remove the cover from the coffee cup and quickly transfer the metal pellets to the calorimeter. Cover the cup and stir for 60 seconds, then record the highest temperature reached. Repeat 1 more time. Choice 3. Use the same calorimeter assembly from choice 1. Obtain 75 mL of two moles and NaOH and place in the calorimeter. Obtain 75 mL of 2 M HCl into a beaker. Add to the HCl from the beaker all at once cover the cup once transferred , stir for 30 seconds.
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