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Biology notes 24 Sept 2008

Biology notes 24 Sept 2008 - energy typically defined as...

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September 24, 2008 energy – typically defined as “ the ability to do work” potential energy – stored energy due to its position (in a gravitational field) or chemical composition chemical-potential energy – the energy that we associate with food closed system – matter can’t be exchanged b/w the system and its surrounding, only energy can, e.g. the earth open system – both energy and matter can freely exchange, e.g. a plant isolated system – completely shut off; no exchange of energy or matter First law of thermodynamics: the total amount of energy in the universe is constant but it can change form drive around with a waterfall in your trunk Second law of thermodynamics – increase in disorder, randomness = ENTROPY (energy transformations are never 100% efficient; we are losing energy when we transform it) evidence that entropy goes up is that things produce heat, which increases entropy entropy of a system and surroundings always increases
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