# Heat - Heat ? What will happen to a glass of hot water if...

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1 Heat ? What will happen to a glass of hot water if placed on the table ? What will happen to a glass of cold water if placed on the table Heat flows from higher concentration to lower concentration Heat balances out or reaches equilibrium

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2 Heat : the transfer of energy between a system and its surroundings Due to a difference in temperature Units: calorie is the heat needed to raise 1 gram of water by 1 °C 1 cal = 4.18 Joules
3 Specific Heat Energy needed to raise 1 gram of a substance by 1 °C, unique to the substance Specific Heat Water 1.00 cal/g •°C Copper 0.093 cal/g •°C More heat is needed to raise the temp of water than copper (for the same amount)

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4 Heat Calculations How much heat is needed to change temperature? (Mass) x (Sp. Heat) x (Temp change) = Heat How many calories (heat) are needed to raise the temp of 25 g of Cu by 10 º C? 25g (0.093 cal/g º C) (10 º C) = 23.25 cal
5 First Law of Thermodynamics Energy is neither created nor destroyed Exothermic Reaction: heat is generated CH 4 + O 2 ± H 2 O + CO 2 + heat Endothermic Reaction: heat is absorbed Heat + N 2 O 4 ± NO 2

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## This note was uploaded on 05/27/2011 for the course SCI 302 taught by Professor Null during the Spring '11 term at GWU.

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Heat - Heat ? What will happen to a glass of hot water if...

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