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Lesson 3 - Bio - The First Law of Thermodynamics Energy...

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1 The First Law of Thermodynamics Energy cannot be created or destroyed but can be transferred and changed in form Organisms cannot create energy. They must capture energy from their surroundings The Second Law of Thermodynamics Entropy in the universe, a closed system, is continuously increasing. “Contrary to popular opinion among those who do not understand it, Entropy does not mean “disorder” in the sense that we usually think about the term. The second law does not dictate the decrease of ordered structure by its predictions. It only demands a "spreading out" of energy when such ordered structures are formed spontaneously.” http://2ndlaw.oxy.edu/evolution.html Example: Formation of snowflakes So No energy transfer is 100% efficient Some energy dissipates as heat, random motion that contributes to entropy ( S ) How does this relate to the history of the universe?
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2 The Earth is a(n) _____ system. 0 of 5 1. Open 2. Closed Closed and Open Systems Closed system no energy exchange with surroundings Organisms are open systems exchange energy with surroundings
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3 KEY CONCEPTS 1. Energy can’t be created or destroyed - first law of thermodynamics 2. Total energy available to do work in a closed system decreases over time - second law of thermodynamics Organisms follow laws of thermodynamics - are open systems - use energy from surroundings to do work -
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