# Thermochemical .pdf - Thermochemical equation An equation...

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Thermochemical equationAn equation that includes the quantity of energy released or absorbed as heat during thereaction as written.A reaction in which energy is released (produced) is called exothermic reaction.A + BC + D +EnergyA reaction in which energy is absorbed (added) is called endothermic reaction.A + B +EnergyC + DExample2H2(g)+ O2(g)2H2O(g)+483.6kJ(exothermic reaction)CO2(g)+283.0 kJCO(g)+½O2(g)(endothermic reaction)Identify whether the reaction is Exothermic or EndothermicExothermic reactionEndothermic reactionEreactantsisgreaterthanEproductsEreactantsislessthanEproductsΔHreactionisnegativeΔHreactionispositiveAB +EnergyA+EnergyBABΔH= (-) valueABΔH= (+) valueEnergy is releasedEnergy is added
Application 1I-Classify the following reactions asendothermicorexothermicreactionsa.C + O2CO2+ 393.5 kJ_____exothermic_________________b.2H2O(l)+571.8 kJ2H2(g)+ O2(g)__________endothermic___________c. C(graphite, s)+½O2(g)CO(g)ΔH= -110.5kJ________exothermic_____________d. H2O(l)H2O(g)ΔHm= 44 kJ mol–1________endothermic______________Application 2Upon adding solid potassium hydroxide pellets to water the following reactiontakes place:KOH(s)KOH(aq) + 43 kJAnswer the following questions regarding the addition of 14.0 g of KOH to water:a.Does the beaker get warmer or colder?

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