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Answer: An open system can exchange both matter and energy with the surroundings. Î´ H is measured when an open system is used as a calorimeter. A closed system has a fixed amount of matter, but it can exchange energy with the surroundings.
Quantum Chemistry. a branch of theoretical chemistry that considers problems of structure and reactivity of chemical compounds as well as problems of bonding from the point of view of the concepts and methods of quantum mechanics.n principle, quantum mechanics permits calculation of the properties of atomic and molecular systems on the basis of the Schroedinger schrÃ¶dinger, Equation pauli exclusion, principle and universal physical. constants