Use the second member of each group from Group 1A to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number.
Angel Carrasquillo CHM 132 Notes Week of 01/24/31 ● Hess’s Law - The total enthalpy is the sum of all changes. Enthalpy is a state function. - ΔHrxn = ΣΔH products - ΣΔH rectants ● ΔHrxn from Bond Dissociation Energy - Bond break absorbs energy - Bond make releases energy - BDE (+) is a homolytic bond cleavage - So… H----H →H + H - each H has its own electron when bond is broken - ΔHrxn = ΣΔH broken - ΣΔH formed (bonds broken and formed) ● Entropy (S) - Organization of energy - spread of energy → ↑entropy ΔS= (+) - Favorable ● Isothermal - Reversal: Rxn always at equilibrium, work put in=work put out, at equilibrium no energy lost or gained. - Irre