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

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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 1°C • Calculating energy requirements ○ Q=ms▲T ○ Q: energy (J) ○ M: mass (g) ○ S: heat capacity of material (J/g°C) ○ ▲T: change in temperature (T 2 – T 1 °C)...
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