Chemistry 1027A/B Chapter Notes - Chapter 4: Heat Capacity, Enthalpy, Jmol
17 Aug 2012
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Heat capacity and specific heat: how much energy is required to raise the temperature of something by one degree, heat capacity, c, is for objects. C has units j/degrees c or j/k: specific heat capacity, c, is for substances. C has units j/g x degrees c or j/g x k: molar heat capacity, c, is for substances using moles. C has units j/mol x degrees c or j/mol x k: used to determine the amount of heat transferred. Q = c (delta) t or q = mc (delta) t or q = nc (delta) t (delta)t = tfinal tinitial (delta)t is the same in degrees c or k: see 4. 1. 1, see 4. 1. 2. Sign conventions: q always indicates the amount of heat transferred, we need to know if this heat is being lost of gained. If heat is lost, the sign of q is negative (-) and this is said to be an exothermic process.
