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Chap 6

# Chap 6 - All you need to know about energy Energy transfer...

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All you need to know about energy Energy transfer is seen in two ways Heat – “random” transfer of energy (energy is transferred on a microscopic level). Associated with a change in temperature Work – “ordered” transfer of energy (energy is transferred to an entire mass, like a block of wood.) Associated with an application of force Energy itself has two forms Potential energy- matter with P.E. has the potential to transfer heat or do work Kinetic energy- matter with K.E. is doing work or generating heat

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More useful energy stuff Law of conservation of energy- energy is not created or destroyed (also the 1 st law of thermodynamics) Kinetic energy = ½mv 2 Energy is a state function which means, mathematically, y = f(x) where y is the energy, and x is the state. State means conditions of the matter you are focusing on, namely, its temperature and pressure This means that going from one state to another requires the same amount of energy, regardless of how you get to one state to another (also known as the “path”)
Thermodynamics Jargon Because we’re dealing with the flow of energy, we’ve developed some rules for expressing where it’s flowing… System – this is the material that we’re considering. If we’re boiling water, the system would be the water, and maybe the pot. Surroundings- everything else in the universe Exothermic- energy flows OUT of the system Endothermic- energy flows INTO the system Remember : exo = out ; endo = in

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What happens during these reactions? Good question! Glad I thought of it… In an exothermic reaction, bonds are broken, which releases energy. This energy is give off randomly, so we see it as heat, and causes the temperature of the system to go up Conversely, in an endothermic reaction, bonds need to be formed which require energy.
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