Pre-Lab Experiment #14 Heat Efects and Calorimetry Marcus Molyneux ProFessor Lemons Chem-110 November 20, 2014 Purpose: The purpose oF today’s lab is to develop a be±er understanding on how to apply calorimetry in real liFe situa²ons. To iden²Fy your given unknown metal by ³nding the speci³c heat oF the metal by using an equa²on, to record the masses oF the water and metal oF their ³nal and ini²al temperatures. Procedure: Specifc Heat A±ain a calorimeter, sensi²ve thermometer, sample oF unknown metal in a stoppered test tube, and an unknown solid. The calorimeter has 2 holes in the cover one hole is For the thermometer while the other is For the glass s²rring rod that has a perpendicular loop at the end. A´er you have the calorimeter set up ³ll a 400-cm 3 beaker 2/3 Full oF water which you will need to heat un²l it reaches a boil. While you wait For the water to reach its boiling point weigh your unknown metal in the stoppered test tube to the nearest 0.1g on either a top-loading or triple-beam balance.
Purpose: To fully understand the effects of heat and to calculate the specific heat of an unknown. Experimental Procedure: Part A: Specific Heat 1. From your instructor obtain a calorimeter, a sensitive thermometer, a sample of metal in a large stoppered test tube. The calorimeter consists of two nested expanded polystyrene coffee cups fitted with a Styrofoam cover. 2. Fill a 400-mL beaker two-thirds full of water and begin heating it to boiling. Fill a 100-mL beaker two-thirds full of water and begin heating it to boiling a well. 3. While the water is heating, weight the sample of unknown metal in the large stoppered test tube to the nearest 0.1g on a top loading balance. 4. Pour the metal into a dry container and weigh the empty test tube and stopper. 5. Replace the metal in the test tube and put the LOOSELY stoppered tube into the hot water in the 400-mL beaker. The water level in the 400-mL beaker should be high enough so that the top of the metal is below the water surface. 6. Continue heating the metal in the water for at least 5 minutes after the water begins to boil to ensure that the metal attains the temperature of the boiling water. Add water as necessary from your 100-mL beaker to the 400-mL beaker to maintain the water level. 7.