151F09_W11_LV_3 - Determine whether the following molecules are polar or not polar NH3 SeF2 SiH4 SF4 XeF4 Yes Yes No Yes No CH2F2 XeH2F2 Yes It

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
UA GenChem Determine whether the following molecules are polar or not polar NH NH 3 CH CH 2 F F 2 SeF SeF 2 XeH XeH 2 F F 2 SiH SiH 4 SF SF 4 XeF XeF 4 Yes Yes No Yes No Yes It depends…
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem Summary Activity: Draw the THREE different Lewis structures for C 2 H 2 F 2 . For each structure, identify: the molecular geometry around each carbon the bond angles around each carbon whether the molecule would be polar or nonpolar
Background image of page 2
UA GenChem Summary Activity: C C H H F F Trigonal planar / 120° polar C C H F H F Trigonal planar / 120° polar C C F H H F Trigonal planar / 120° nonpolar cis- isomer trans- isomer
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 11
Background image of page 4
UA GenChem Forces and Particles INTRA MOLECULAR Forces within the molecule. Holds atoms together Determines the electron and molecular geometries. N≡N has strong intramolecular forces INTER MOLECULAR Forces between separate molecules. The forces between many particles determine the macroscopic properties.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem Intermolecular Forces Molecules in a substance interact with each other via intermolecular forces. The strength of these forces depends on the nature of the atoms in the molecule and on the molecular geometry .
Background image of page 6
UA GenChem Intermolecular forces determine properties of molecular compounds such as: boiling point, melting point, density Intermolecular Forces
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem Intermolecular Forces Stronger intermolecula r forces: *higher melting point *higher boiling point *more energy required to separate the molecules T ( o C) -100 -50 0 50 Gas Gas Liquid Liquid Solid Solid Stronger Intermolecular Forces
Background image of page 8
UA GenChem Dipole-Dipole Forces The intermolecular forces between molecules with permanent dipole moments (polar) are called dipole-dipole forces.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem Dipole-Dipole Forces In polar molecules: The larger the permanent dipole, the stronger the intermolecular forces What could you predict about the boiling point of these substances?
Background image of page 10
UA GenChem Dipole-Dipole Forces
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
UA GenChem
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

Page1 / 37

151F09_W11_LV_3 - Determine whether the following molecules are polar or not polar NH3 SeF2 SiH4 SF4 XeF4 Yes Yes No Yes No CH2F2 XeH2F2 Yes It

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online