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 = cmΔT or q= cmΔT, where c is specific heat, m is mass, and ΔT is change in temperature.
This is the end of the preview.
access the rest of the document.