lecture 4 - 1 A chemical reaction in a container produces...

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Unformatted text preview: 1 A chemical reaction in a container produces heat, q , and does work, w , by expanding while the pressure is kept constant, e.g. burning gasoline in an automobile engine. Which one of the statements A C is not correct? If all are correct, respond D. A) The heat produced is determined by the enthalpy change for the reaction, H. B) The change in energy, E, of the reacting system (reactants and products) is negative. C) The difference between the enthalpy change and the energy change equals the pressure times the volume change, H E = P V D) A C all are correct. 2 A) Under conditions of constant pressure with only PV work, q is called the enthalpy change, H. E = q + w Produces heat means energy is being transferred out. Does work also means energy is being transferred out. So q < 0, w < 0, and E < 0 C E = H P V H E = P V 3 HELP!!!! Go to Bb Course Info 4 Todays To Do Note: sometimes the class presentation falls behind. Use thermochemical reaction equations to determine the amount of energy transferred in a chemical reaction. Estimate reaction enthalpies from bond enthalpies. Calculate energy transferred in a phase transition. amount of energy transferred = heat heat of a reaction = reaction enthalpy = enthalpy change under certain conditions 5 Use temperature changes in a calorimeter to determine E and H for a reaction. Distinguish between a state function and a path function. State and describe the utility of Hesss Law. Use standard enthalpies of formation to determine standard reaction enthalpies. Use enthalpies of a set of reactions to determine the enthalpy of another reaction....
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This note was uploaded on 02/12/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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lecture 4 - 1 A chemical reaction in a container produces...

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