Chapter 5:. Thermochemistry. Thermochemistry:. Energy Kinetic & Potential First Law of Thermo internal energy, heat & work endothermic & exothermic processes state functions Enthalpy Enthalpies of Reaction. Calorimetry heat capacity and specific heat constant-pressure calorimetry
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Systems & Surroundings
energy(as heat or work)
2H2(g) + O2(g)
no exchg of matterwith surroundings
- q - w
DH > 0
DH < 0
remember: this is change in temp.
must be opposite in sign
if DT is positive then qrxn is exothermic
heat capacity of calorimeter
because rxn is exothermic
2H2O(g)® 2H2O(l)D H = - 88 kJ
Cgraphite® CdiamondD H = + 1.9 kJ