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Kinetics and Thermodynamics

Kinetics and Thermodynamics. Specifically Thermodynamics Today…. Defining Energy. The ability to do work Two types Potential Energy: stored energy; energy of a non-moving object Kinetic Energy: energy of a moving object. First Law of Thermodynamics.

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Kinetics and Thermodynamics

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  1. Kinetics and Thermodynamics Specifically Thermodynamics Today…

  2. Defining Energy • The ability to do work • Two types • Potential Energy: stored energy; energy of a non-moving object • Kinetic Energy: energy of a moving object

  3. First Law of Thermodynamics • State: The energy within a system remains constant • It can transfer from potential to kinetic, but will not be lost or gained

  4. Heat • Heat is a form of energy • Two units • Joules • Calories • How to transfer between them: • 1 J = 0.2390 cal • 1 cal = 4.184 J

  5. Samples • Answers: • 1) 8.79 Joules • 2) 4.5627 kcal • 3) 2270.55 calories

  6. Specific Heat (c) • Also called the heat capacity • Heat required to raise 1 gram of a substance by 1 Kelvin

  7. Calculating Heat Absorbed in a Reaction (q) • q = c x m x ∆ T • c = specific heat capacity • Different for every substance • m = mass (in grams) • ∆T = change in temperature (in Celsius…this is new!)

  8. Sample Problem Answers • 1) 4515.76 J • 2) 2.45 J/g˚C • 3) 0.31 J/g˚C

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