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Chapter 6

Chem*1050 Textbook Chapter 6 Summary Notes

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CHEM 1050
Lori Jones

Chem 1050 Text Chapters 6163 66Chapter 61 Energy and Its UnitsEnergy the potential or capacity to move matter energy is a property of matter and exists in many forms that can be interconverted for example can be interconverted from heat energy to electrical energy to light energy etcKinetic Energy Units of EnergyKinetic Energy energy associated with an object by virtue of its motion2E mv mmassvvelocityEkinetic energykk kinetic energy depends both onmass and speed thus a heavier object could move more slowly than a lighter object and still retain the same kinetic energy22 the SI unit of energy is kgms otherwise known as joules J one watt is 1 Jsie a 100 watt bulb uses 100 J of energy every second a kilowatt hour is 3600 kilowatt seconds or 36 million joulesCalorie cal a non SI unit of energy commonly used by chemists originally defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius1 cal4184 JPotential EnergyPotential Energy the energy an object has by virtue of its position in a field of force 2E mgh mmassggravity 9807mshheight of water p only differences in potential energy are important in any physical situationfor example as something falls its potential energy decreases from mgh at the top to 0 at standard level as an object is falling the potential energy is converted to kinetic energyas potential energy decreases kinetic energy increases Internal EnergyInternal Energy U the sum of the kinetic and potential energies of the particles making up a substance EEEU totkp when studying a substance in a lab its kinetic energy is 0 at rest and its potential energy is a constant and thus can be taken as 0 and therefore the total energy of the substance is equal to its internal energy ULaw of Conservation of EnergyEnergy may be converted from one form to another but the total quantity of energy remains constantenergy is conserved the first law of thermodynamics is a specific statement of the conservation of energy
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