Measuring heat changes. Section 11.2. After reading Section 11.2, you should know:. How to write or interpret a thermochemical equation How to calculate heat changes in a chemical or physical process. Calorimetry.
(heat is a absorbed, so it is a reactant):
2 NaHCO3(s) + 129 kJ → Na2CO3(s) + CO2(g) + H2O(g)
2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) ∆H = +129 kJ
(heat is given off, so it is a product):
CaO(s) + H2O(l) → Ca(OH)2(s) + 65.2 kJ
CaO(s) + H2O(l) → Ca(OH)2(s) ∆H = − 65.2 kJ