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Chem Thermodynamics Discussion.docx

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Department
Chemistry
Course Code
CAS CH 131
Professor
Mark Grinstaff

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Endo thermic reaction – releases energy and a positive value when talking about change  in heat Exothermic reaction – takes in energy and a negative value when talking about change in  heat Work being done by the system – system is doing work change in work is negative Work being done onto system – system acquiring energy and work is positive Baloon expands from 5L to 5.7L. Pressure inside of the balloon na dn the surrounding is  about 2.1 ATM. What was the change in work of the system in the surrounding? What  can be done to the gas to insure that there is 0 change in internal energy? Assume there is 0 heat transger Delta U=Delta Q+Delta W W=pDeltaV Delta W = ­2.1 ATM *.7L=­1.47 ATM*L Delta W= ­.0147J Delta U= ­.0147J A water fall was examined. Temp of the water at the top was measured along with the  bottom. If the water fall is 100m high and all the potential energy has been converted into  thermanl energy. What is the difference between 150 g of water at the top and 150 g at the bottom. Cs of water= 4.18 J*g*K Delta Epotential=m*G*DeltaH Delta Epotential= 15kg*10*­100 meters Delta Epotential = ­150 J Delta Epotential – Delta Thermal Energy ­(­150J) = 150J of thermal energy (Q) Delta Qwater= Mass*Cs*DeltaT 150J=150*4.18*DeltaT 150/(150*4.18)=.24K A 61 gram hot piece of metal at 120 degrees C into 100 g of water at 20 degrees C. The  metal cools and the water heats up until they both reach room temperature of 26.39  degree C. What is the specific heat of the metal if water has a specific heat of 4.18J*g*K? DeltaQ of metal=­DeltaQ of water ­DeltaQ of water
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