Exp6_prelab

Exp6_prelab - Experiment 6 Thermochemistry Goals of the...

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Experiment 6 Thermochemistry
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Goals of the Experiment Introduce: 1) Thermochemistry 2) Calorimetry 3) Hess’s Law and Thermochemical Equations 4) Principles of Endothermic and Exothermic Reactions
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Introduction to Thermochemistry Thermochemistry is the study of heat energy transfer resulting from a chemical reaction or change of physical state.
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1. Thermodynamic System In a closed system, the system and its surroundings interact through energy transfer only (no mass transfer). Energy Transfer
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The system has a certain amount of energy associated with it known as its internal energy (U) . This internal energy (U) of a system is comprised of 2 components: a. Kinetic Energy (resulting from the motion of the molecules) b. Potential Energy (resulting from chemical bonds/electrostatic interactions of the molecules) 2. Internal Energy of the System
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The system can undergo a change of state : NaOH (s) + HCl (aq) NaCl (aq) + H 2 O (l) There is a certain amount of internal energy associated with each state (U i and U f ): Δ U = U f - U i We are interested in describing the change in internal energy ( Δ U) that results from a change of state . 3. Change of State State 1 U i State 2 U f
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4. Change in Internal Energy ( Δ U ) The change in internal energy going from State 1 to State 2 is caused by the exchange of energy between the system and surroundings : Energy Transfer
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Exp6_prelab - Experiment 6 Thermochemistry Goals of the...

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