Calorimetry

Calorimetry - Calorimetry Burning of a Match Potential...

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Calorimetry
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Burning of a Match Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 293 Surroundings System (Reactants) ∆(ΠΕ29 Potential energy (Products)
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Conservation of Energy in a Chemical Reaction Surroundings System Surroundings System Energy Before reaction After reaction In this example, the energy of the reactants and products increases, while the energy of the surroundings decreases. In every case, however, the total energy does not change. Myers, Oldham, Tocci, Chemistry , 2004, page 41 Endothermic Reaction Reactant + Energy Product
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Conservation of Energy in a Chemical Reaction Surroundings System Surroundings System Energy Before reaction After reaction In this example, the energy of the reactants and products decreases, while the energy of the surroundings increases. In every case, however, the total energy does not change. Myers, Oldham, Tocci, Chemistry , 2004, page 41 Exothermic Reaction Reactant Product + Energy
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Direction of Heat Flow Surroundings ENDOthermic qsys > 0 EXOthermic qsys < 0 System Kotz, Purcell, Chemistry & Chemical Reactivity 1991, page 207 System H2O( s ) + heat  H2O( l ) melting H2O( l )  H2O( s ) + heat freezing
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Caloric Values Food joules/grams calories/gram Calories/gram Protein 17 000 4000 4 Fat 38 000 9000 9 Carbohydrates 17 000 4000 4 Smoot, Smith, Price, Chemistry A Modern Course , 1990, page 51 1000 calories = 1 Calorie "science" "food" 1calories = 4.184 joules
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Typical apparatus used in this activity include a boiler (such as large glass beaker), a heat source (Bunsen burner or hot plate), a stand or tripod for the boiler, a calorimeter, thermometers, samples (typically samples of copper, aluminum, zinc, tin, or lead), tongs (or forceps or string) to handle samples, and a balance. Experimental Determination of Specific Heat of a Metal
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A Coffee Cup Calorimeter Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 302 Thermometer Styrofoam cover Styrofoam cups Stirrer
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Bomb Calorimeter thermometer stirrer full of water ignition wire steel “bomb” sample
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1997 Encyclopedia Britanica, Inc. oxygen supply stirrer thermometer magnifying eyepiece air space crucible steel bomb sample ignition coil bucket heater water ignition wires insulating jacket
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A Bomb Calorimeter
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Causes of Change - Calorimetry Outline Keys http://www.unit5.org/chemistry/Matter.html
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Heating Curves Melting - PE Solid - KE Liquid - KE  Boiling - PE Gas - KE Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Heating Curves Temperature (oC) 40 20 0 -20 -40 -60 -80 -100 120 100 80 60 140 Time Melting - PE Solid - KE Liquid - KE  Boiling - PE Gas - KE
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Heating Curves Temperature (oC) 40 20 0 -20 -40 -60 -80 -100 120 100 80 60 140 Time Melting - PE Solid - KE Liquid - KE  Boiling - PE Gas - KE
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Temperature Change change in KE (molecular motion) depends on heat capacity Heat Capacity energy required to raise the temp of 1 gram of a substance by 1°C
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This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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Calorimetry - Calorimetry Burning of a Match Potential...

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