lecture8 - Understanding molecules Chem 1A Lecture 8: MC...

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Unformatted text preview: Understanding molecules Chem 1A Lecture 8: MC Web example H C N O F P S Cl Br I B BI 3 (l) The answer is BI 3 (l) CORRECT BINARY NONMETAL COMPOUNDS Give the formula and state for the species whose visualization is shown MC Web example H C N O F P S Cl Br I B BINARY NONMETAL COMPOUNDS CORRECT CS 2 (s) The answer is CS 2 (s) Give the formula and state for the species whose visualization is shown MC Web example H C N O F P S Cl Br I B CORRECT NH 3 (g) The answer is NH 3 (g) BINARY NONMETAL COMPOUNDS Give the formula and state for the species whose visualization is shown Dipole moment Fractional charge distribution in polar bonds may lead to a dipole moment of the molecule + H F - Dipolar covalent bonds have a dipole moment. Dipole moment Dipole moment makes the molecules response to an electric field Dipole moment A molecule like water also exhibits a dipole moment Dipole moment Dipole moment Due to cancellation, not all molecules with polar bonds have a dipole moment. No net dipole in CO 2 Dipole moment Dipole moment Do the molecules HCl, H 2 S and SO 3 have a dipole moment? H Cl HCl: + - dipole H H S + + 2 - dipole H 2 S: O O S O no dipole SO 3 : - - - 3 + Ionic bond In an ionic bond, electrostatic interactions lead to a stable aggregation of oppositely charged ions. In an ionic bond there is a complete charge separation Na + Cl- Na + Cl- Cl- Cl- Cl- Na + Na + Na + Na + in solid + + +--- in gas Ionic bond Electron configurations of ionic compounds Calcium oxide: Ca: O: [Ar]4s 2 1s 2 2s 2 2p 4 } Ca 2+ O 2- [Ar] [Ne] In forming ionic bonds, individual elements assume a stable ionic electron configuration...
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This note was uploaded on 02/25/2012 for the course CHEM 1A 40030 taught by Professor Borovick during the Fall '10 term at UC Irvine.

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lecture8 - Understanding molecules Chem 1A Lecture 8: MC...

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