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# Chapter 6 - Forms of energy...

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Interaction of system with surroundings State function Path function

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Heat and Transfer of thermal energy Heat is the transfer of thermal energy that results due to changes in temperature. Measured in calories and Joules (1cal =4.184 J). Time = 0 Time > 0 Hot object Colder object Temperature: A measure of hotness or coldness of an object.
Quantity of heat (q) Molar heat capacity of a system (C): Heat required to change the temperature of 1 mole of a system 1 0 Specific heat: Heat required to change the temperature of 1 gram of a system 1 0 Quantity of heat (q) = mass x specific heat x temperature change m x Sp.heat x Δ T C x Δ T http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/FG07_03.JPG q sys = - q surr If a substance X has a specific heat of 0.435 J/g 0 C, what mass of the substance will cause a rise in temperature water from 30 0 C to 100 0 C?

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Chapter 6 - Forms of energy...

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