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Riya Sood 4G wrote:Is Delta H positive or negative for a combustion reaction?
If delta H is positive, this means that heat was absorbed in the chemical reaction (endothermic), and thus the surroundings loose heat, or become cold.
The opposite is true for negative delta H. This means that heat was released in the chemical reaction (exothermic), and thus the surroundings gain heat, or become hot.
Think of combustion as burning, so if you think about it, it is exothermic.