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study-note-4-39 - Thermochemistry Study Notes(chapter 5 You...

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Thermochemistry Study Notes (chapter 5) You should be familiar with the sample calculations in chapter 5 (especially examples 5.4, 5.7, and 5.8). 5.1-5.2 How many Joules are in one calorie? 1 cal = 4.2 J Give water’s specific heat (with units) 4.2 J/(g ° C) Define “thermal property”. Give three examples. The ability of a substance to absorb heat without changing chemically. E.g. heat capacity, molar heat capacity, specific heat (capacity). Distinguish between heat capacity, molar heat capacity, and specific heat capacity. Heat capacity is the amount of heat that must move into or out of an object to change its temperature by 1 ° C. It has units of J/ ° C. Specific heat is similar, except it is expressed on a per gram basis (J/(g ⋅° C)). Molar heat capacity has units of J/(mol ⋅° C). How can one calculate the energy that is absorbed or released in a reaction? energy change = cm Δ T or q = cm Δ T, where c is specific heat, m is mass, and Δ T is change in temperature.
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