Lecture 3 Notes - Chemical change Energy and heat Energy...

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Lecture 3 Notes Matter Universe is composed of two things: Matter- anything that has mass and takes up space Energy – the ability to do work (no mass) Matter is composed of atoms Molecule- product of two or more atoms Element- a single type of atom – look at the periodic table Compound – multiple elements Mixture – physical intermingling of two or more substances Filtration – differences in solubility Distillation – differences in boiling point Forms of matter Solid- closely associated atoms Crystalline – long range (ie. Salt) Amorphous – little order (ie. Plastic) Liquid Atoms loosely associated Gas Atoms viewed as not interacting
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Unformatted text preview: Chemical change Energy and heat Energy ability to do work Measured as heat Heat flow of energy due to a temperature change () Always goes from hot to cold Energy and chemistry Exothermic Endothermic Unites of energy Joule and the Calorie 1 cal = 4.18 J. Exactly 1000 cal = 1 Cal Heat capacity (specified heat) is the amount of energy required to raise 1g of a sample by 1C Calculating energy requirements Q=msT Q: energy (J) M: mass (g) S: heat capacity of material (J/gC) T: change in temperature (T 2 T 1 C)...
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This note was uploaded on 07/02/2008 for the course 004 007 taught by Professor Haverhals during the Summer '08 term at University of Iowa.

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