intermolecular-forces

intermolecular-forces - Questions Why do some solids...

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Why do some solids dissolve in water but others do not? Why are some substances gases at room temperature, but others are liquid or solid? What gives metals the ability to conduct electricity, what makes non-metals brittle? The answers have to do with … Intermolecular forces Intermolecular forces Questions
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Overview Overview There are 2 types of attraction in molecules: intra molecular forces We have already looked at intra molecular bonds (ionic, polar, non-polar) Inter molecular forces (IMF) have to do with the attraction between molecules (vs. the attraction between atoms in a molecule) IMFs come in six flavours: 1) ionic, 2) dipole - dipole, 3) H-bonding, 4) London forces, 5) covalent (network solids), 6) metallic Intermolecular forces Intermolecular forces
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Ionic, Dipole - Dipole attractions Ionic, Dipole - Dipole attractions We have seen that molecules can have a separation of charge This happens in both ionic and polar bonds (the greater the EN, the greater the dipoles) H Cl δ + δ Molecules are attracted to each other in a compound by these +ve and -ve forces δ + δ + δ δ + δ
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H - bonding H - bonding H-bonding is a special type of dipole - dipole attraction that is very strong It occurs when N, O, or F are bonded to H Q- Calculate the EN for HCl and H 2 O A- HCl = 2.9-2.1 = 0.8, H 2 O = 3.5-2.1 = 1.4 The high EN of NH, OH, and HF bonds cause these to be strong forces (about 5x
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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intermolecular-forces - Questions Why do some solids...

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