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Lecture 11 – Flow of Energy

Lecture 11 – Flow of Energy - Lecture 11...

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Lecture 11 – Flow of Energy A. Introduction - Living organisms To be alive, we need energy Being an organized, moving organism requires energy We can’t make our own energy - Transform ation We can only transform e n ergy B. Energy transform ation 1. Energy - The ability to do work 2. Types - Living organisms convert types of e n ergy from one form to another 1) Radiant e n ergy, a.k.a. - Electrom agn etic en ergy - Com es from the sun 2) Electric e n ergy 3) Che mical en ergy - Bonds - Glucose (C 6 H 12 O 6 ) 4) Sound energy 5) Mechanical energy 6) Heat energy - Som e che mists say he at is a process, not e n ergy 3. Ther modyna mics - The study of e n ergy transform ation - “Thermo” = “he at” - “Dyna mics” – “moving”
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4. 1 st Law of Thermodynamics - Conservation of en ergy The total en ergy in the universe is constant You can chang e en ergy from one form to another, but en ergy cannot b e creat ed or destroyed - H = G + TS H = e nthalpy - The total a m ount of e n ergy - Doesn’t chang e G = free en ergy - Useful en ergy - We can do work with free en ergy b ecause it is unst able - Has a gradient T = te m p er ature S = e ntropy - Useless en ergy - Disorder -
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