Heat changes in chemical reactions

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This document discusses heat changes that occur during chemical reactions and how temperature affects reaction yields. It explains that exothermic reactions release heat and cause temperature to rise, while endothermic reactions absorb heat and cause temperature to drop. The energy levels of reactants and products are used to determine if a reaction is exothermic or endothermic. For industrial chemical processes that are exothermic and reversible, a moderate temperature is used to achieve a good product yield while allowing the reaction to proceed sufficiently. Examples provided are the Haber and contact processes for ammonia and sulfuric acid production.

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