chapter 6 paragrpah summary

chapter 6 paragrpah summary - The standard molar enthalpy...

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Dhaval Rana Chemistry May 20, 2008 Chapter 16 Paragraph Summary Section1 Thermo chemistry is the study of the changes in energy that accompany chemical reactions and physical changes A thermo chemical equations is an equation that includes the quantity of energy released or absorbed as heat during the reaction as written An enthalpy change is the amount of energy absorbed as heat by a system in a process carried out at constant pressure The enthalpy of reaction is the enthalpy change that occurs during a chemical reaction The enthalpy change is negative for exothermic reactions and positive for endothermic reactions Compounds with highly negative enthalpies of formation tend to be stable; compound with highly positive or only slightly negative enthalpies of formation tend to be unstable
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Unformatted text preview: The standard molar enthalpy of formation is the enthalpy change that occurs when one mole of a compound is formed from its elements in their standard states at 25 C and 1 atm The enthalpy change that occurs in a combustion reaction is called the enthalpy of combustion Enthalpies of reaction can be calculated by using enthalpies of formation of reactants and products Section2 The tendency throughout nature is for a reaction to proceed in the direction that leads to a lower energy state Entropy is a measure of the randomness of a system Free-energy change combines the effects of entropy and enthalpy changes and temperature of a system , and its is a measure of overall tendency toward natural change....
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