Details Title: VSEPR theory chapter Description: molecular shape and bonds Total Flash Cards: 28 Created: 11/15/2007 19:06:32		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Chemistry Flashcards
Cards in this set: Term VSEPR Theory Definition Valence Shell Electron Pair Repulsion Theory- the repulsion between electron pairs cause molecular shapes to adjust so that the valence-electron stay as far apart as possible. Term Shape:   H-O-H Definition Linear Triatomic Term Shape Definition Triagonal Planar Term Shape: O: H   H Definition Bent Triatomic Term Shape Definition Pyramidal Term Shape Definition Tetrahedral Term Shape Definition Triagonal Bipyramidal Term Shape Definition Octahedral Term Linear Properties (5) Definition A2 or AX (diatomic) AX2 (triatomic) 1 or 2 shared pairs No unshared pairs on central atom Bond angle: 180o Term Bent Properties (4) Definition AB2 2 shared pairs Some unshared pairs on central atom Bond angle: less than 180o Term Triagonal Planar Properties (4) Definition AX3 3 shared pairs No unshared pairs on central atom Bond angle: 120o Term Triagonal Bipyramidal propertes (4) Definition AX5 5 unshared pairs No unshared pairs on central atom Bond angle: 90o and 120o Term Octahedral properties (4) Definition AX6 6 unshared pairs No unshared pairs on central atom Bond angle: 90o Term Polar Bond properties (2) Definition Uneven charge distribution difference in electronegatibity (0.3- 1.7) 2 different atoms in a bond Term Nonpolar bond properties (3) Definition Equal charge distribution no difference in electronegatibity USameU atoms in a bond Term Polar Bond examples Definition H-Cl Mg- O C-F S-Br Term Nonpolar Bond Examples Definition H-H Cl-Cl S-S C-C Term If a molecule is symmetrical then it is (polar/nonpolar) Definition Nonpolar Term If a molecule is not symmetrical, then it is (polar/nonpolar) Definition Polar Term Diatomic elements definition Definition Elements that are always found in pairs. Term List Diatomic elements Definition 7  Oxygen Nitrogen Flourine Chlorine Bromine Iodine Hydrogen located in the shape of a seven on the periodic table ecept for hydrogen Term "Like dissolves like" meaning Definition Polar solutions dissolve polar materials Nonpolar solutions dissolve nonpolar materials Polar solutions do not dissolve nonpolar materials Term Intermolecular Forces Definition Van der Waals forces between one molecule and its neighbor Term Dipole- dipole interactions (3) Definition Between polar molecues Positive end of one molecule attracts negative end of another molecule Gives polar molecules higher poiling points than nonpolar molecules Term London dispersion forces (4) Definition Between nonpolar molecules Most common force Very weak force E-movement causes temporary dipole Term Note: All molecules have _____, but nonpolar molecules ONLY have ______! Definition London Forces (omit if first) Term Hydrogen bonding (3) Definition Must have H bonded to N, O, or F Strongest intermolecular force Gives water special properties Term Special Properties of Water These properties make our life on earth possible! (7) Definition Low melting point High boiling point High heat of vaporation Surface tension Capillary action Solid is less dense than liquid Universal solvent