CH 15 Heat Flashcards
Calorie meter
A insulated device used for measuring the amount of heat absorbed or released during a chemical or physical process
Thermochemistry
The study of heat changes that accompany chemical reactions and phase changes.
What is the system in thermochemistry
The specific part of the universe that contains the reaction or process you wish to study.
What is surroundings inside thermochemistry
Everything in the universe other than the system
What is the universe in thermochemistry
Universe = system + surroundings
Why is it impossible to know the total energy content of a substance
Because the total amount of energy a substance contains depends of many factors, some of which are not completely understood.
Enthalpy (H)
The heat content of a system at constant temperature
Enthalpy heat of reaction
The change in Enthalpy for a reaction.
True or false: Enthalpy changes for exothermic reactions are always negative while the changes for endothermic reactions are always positive
True
