CHEM 1060 Lecture Notes - Lecture 3: Phase Transition, Carbon Tetrachloride, Spontaneous Process
27 Feb 2017
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Chem1050 guided reading week 3: thermo part 3. The average enthalpy change for the breaking of an a-b bond in a molecule in the gas phase. 9. 11: bond enthalpy: define bond enthalpy, estimate (cid:730)(cid:41) from bond energies. Break bonds in the reactants and then form new bonds to give the products. Polyethylene is formed by linking many ethylene molecules into long chains. Estimate the enthalpy change per mole of ethylene for this reaction using bond enthalpies (cid:730)(cid:41) = (bonds broken) - (bonds formed) A chemical bond formed by the electrostatic attraction between positive and negative ions. A symbol in which the electrons in the valence shell of an atom or ion are represented by dots placed around the letter symbol of an element. 9. 1: describing ionic bonds: define ionic bond, explain the lewis-electron-dot symbol of an atom, describe the energetics of ionic boning, define lattice energy, describe the born-haber cycle to obtain lattice energy from thermodynamic data.
