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What does it mean when energy is reported with a negative sign? A positive sign?

What does it mean when WORK is reported with a negative sign? A positive sign?

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  1. when it is reported with a negative sign, it means that heat is being loss by the system to the surrounding, in other words an exothermic reaction.
    When it is reported with a positive sign, it means that heat is being gained by the system from the surrounding, in other words an endothermic reaction.

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