chem p

is the study of the energy and heat associated with chemical reactions and physical transformations. A reaction may release or absorb energy, and a phase change may do the same, such as in melting and boiling

work done by the system and release heat

work done on the system and absorb heat

the process of measuring the amount of heat released or absorbed during a chemical reaction

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m

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AT

is a well defined part of the universe singled out for study

is the remainder of the universe