Chapter 4,5,6 - WEEK 7 Lecture 2 Titration Analytical...

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WEEK 7, Lecture 2Titration
Chapter 5Thermochemistry What isEnergy?
Heat and work are not fClosed System:One in which energy can be exchanged (through q or w) between system and surround but no matter How can energy be transferredoWorkoHeat: transfer of thermal (kinetic) energy between two systems at different temperatures Energy is neither created nor destroyed The total energy of the universe is a constant; if the system loses energy, it must be gainedInternal EnergyThe sum of all kinetic and potential energies of the systems. An exothermic process indicates heat is lost by system An endothermic process indicates heat is gained by system Enthalpy Change in energy, E, during a chemical reaction under constant pressure is approximately equal to the heat involved in the reaction. Enthalpy is used to describe heat in The enthalpy change for a chemical reaction equals the change in internal energy when work is negligible ∆ H=∆ EThe enthalpy, ∆ H ,for a reaction is a measure fo the heat gain or lost during reaction<0->0- ∆ Hfor a reaction in the forward direction is equal in size, but opposie in sign, to ∆ Hforthe reverse reaction (previous slides)oCH4(g)+2O2(

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