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lecture8 - Chem 1A Lecture 8 Understanding molecules BINARY...

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Understanding molecules Chem 1A Lecture 8:
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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
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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
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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
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Dipole moment Fractional charge distribution in polar bonds may lead to a dipole moment of the molecule δ + H F δ - Dipolar covalent bonds have a dipole moment.
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Dipole moment Dipole moment makes the molecules response to an electric field
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Dipole moment A molecule like water also exhibits a dipole moment
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Dipole moment
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Dipole moment Due to cancellation, not all molecules with polar bonds have a dipole moment. No net dipole in CO 2
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Dipole moment
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Dipole moment Do the molecules HCl, H 2 S and SO 3 have a dipole moment? H Cl HCl: δ + δ - dipole H H S δ + δ + 2 δ - dipole H 2 S: O O S O no dipole SO 3 : δ - δ - δ - 3 δ +
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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
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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 CaO Lithium oxide: Li: O: 1s 2 2s 1 1s 2
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