Classified in Chemistry

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1. During a chemical or physical change, energy can be neither created nor destroyed although its form can change. 2. In an energy exchange, energy is transferred between the system and the surroundings if the system loses energy, the surroundings gain energy and vise versa. 3. A type of quantity (internal energy), the value of it depends only on the state that a system is in and not on how that state is reached. ( altitude on elevation). 4. Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume. D-A-D-A-B  

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