exp7_prelab

exp7_prelab - Experiment 7 Thermochemistry Lab Goals 1....

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Experiment 7 Experiment 7 Thermochemistry Thermochemistry
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Lab Goals Lab Goals 1. Thermochemistry 2. Calorimetry 3. Hess’ Law and Thermochemical Equations 4. Principals of exothermic and endothermic reactions
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Introduction to Introduction to Thermochemistry Thermochemistry Thermochemistry – the study of heat energy transfer resulting from a chemical reaction or change of physical state 1. Thermodynamic System NaOH(s) + HCl(aq) Surroundings System Energy In a closed system the system and its surroundings interact through energy transfer only (no mass transfer)
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2. Internal Energy of the System The system has a certain amount of energy associated with it known as its internal energy (U) This internal energy (U) of the system is broken up into 2 components … a. Kinetic Energy (resulting from the motion of the molecules) b. Potential Energy (resulting from chemical bonds/electrostatic interactions of the molecules)
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3. Change of State The system can undergo a change of state NaOH(s) + HCl(aq) Æ NaCl(aq) + H 2 O(l) State 1 State 2 U f U i There is a certain amount of internal energy associated with each state (U i and U f ) U = U f - U i We are interested in describing the change in internal energy ( U) that results from a change of state
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4. Change in Internal Energy ( U) State 1 Æ State 2 The change in internal energy is caused by the exchange of energy between the system and surroundings
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This note was uploaded on 03/22/2008 for the course CHEM 112 taught by Professor Bilts during the Spring '08 term at Linn Tech.

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exp7_prelab - Experiment 7 Thermochemistry Lab Goals 1....

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