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Heat of reaction — calorimetry, enthalpy and Hess's law.
Every reaction releases or absorbs heat, and the calorimeter is where you catch it. These CBSE Class 12 simulations put a polystyrene calorimeter, a thermometer and two measuring cylinders in your hands: mix a measured acid with a measured base, read the temperature jump off the cooling curve, and turn ΔT into the molar enthalpy of neutralisation — discovering why every strong acid + strong base gives the same −57 kJ/mol, and why a weak acid gives less.
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