PPT Slide

2

Energy Flow to and from a System

• To measure a change in energy, we must define a system; that part of the universe whose change is to be measured.

• The sum of the kinetic and potential energies of all the particles in the system is its internal energy, E.

• As a chemical system changes from reactants to products, the internal energy of the system changes.

• _E = Efinal ñ Einitial = Eproducts ñ Ereactants

• The energy change appears as heat and/or work. DE = q + w

Concept 6-1 distinction between a system and its surroundings

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