Calorimetry. Mr. Dvorsky SCH 4U1. A calorimeter is an object used for measuring the heat of a chemical reaction or physical change. Can be as simple as a pair of cups and a thermometer, or as complex as a device attached to the Large Hadron Collider.
A calorimeter is an object used for measuring the heat of a chemical reaction or physical change.
Ideally, the calorimeter does not allow system to exchange either matter or energy with the surroundings (isolated).
You can view it as water being one system and the process occurring in another system. They are in thermal contact but isolated from the rest of the universe.
Thermal energy released by the system = -thermal energy absorbed by the surroundings
Heat lost (or gained) by the system = -heat gained (or lost) by the surroundings.
System = chemical change you are studying, and the surroundings = water in the calorimeter.
Since the mass of water and its specific heat capacity is known, you can calculate the change in thermal energy using Q = mcΔT
ΔH = nΔHr