Reactions can be classed as exothermic or endothermic. ____ reactions release heat energy to the surroundings, and as a result we observe a temperature ____. ____ reactions absorb heat energy from the surroundings and therefore we observe a temperature ____. ____ (enthalpy change) will be a ____ value for endothermic reactions, and a ____ value for exothermic reactions. Every reactions will have a different ΔH value depending on the amount of energy absorbed and released when different bonds are broken and formed.

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