PPT-Compounds with Polar

p Bonds In each of these species on the right however the C atom of the polar π bond possesses a leaving group The presence of a leaving group facilitates another type of reaction with . thermal$ stable Both the Southern the Southern almost exclusively ice). A September and the sea even at mer minimum surface (roughly km?) remains ice-covered. the sea-ice cover much less the Southern Unit 16. Shapes and Electrical Properties of Molecular Compounds. VSEPR . Theory (4.12). Electronegativity (4.7). Identification of Compounds as Polar or . Nonpolar. (4.13). VSEPR Theory (4.12). The geometry of molecules is important in determining some of their properties. 1 of Highly Polar Compounds Jack E. Silver , jsilver@teledyne.com, Paul Bellinghausen, and Nancy Fowler, Teledyne Isco, Inc., 4700 Superior Street, Lincoln, NE 68504 Abstract Highly polar compounds . and Cells. Elements of Life. A few major elements make up virtually all living things. Roughly 96% of an organism’s mass (including humans) is composed of just 4 elements. Oxygen. Carbon. Hydrogen. Dissolving Compounds. For . a substance to dissolve, . solute-solvent . attractions must overcome the . attractions . within both solute and solvent. . Example: In order to dissolve, ionic bonds must be broken by water. . Chemical compounds in living systems. COMPOSITION OF LIVING THINGS. 70 – 90% water. Remaining 10% are Carbon based compounds. Other essential elements included in these compounds????. H, O, N, S, P. Bonding Discussion. Bonding. . Ionic. . Covalent. . Metallic. Determined by difference in Electronegativity between atoms.. Ionic . Compounds. Crystalline . solids (made of ions) . High melting and boiling points . Understand . factors that influence the choice of solvents, including:. i. ) . water, to dissolve some ionic compounds, in terms of the hydration of the ions. ii) . water, to dissolve simple alcohols, in terms of hydrogen bonding. Types of Solutions. Remember, a solution is a homogenous mixture of two or more substances. Saturated solution . – contains the maximum number of solute that will dissolve in a solvent at a specific temperature. Lecture 7 a Chromatography I Introduction Chromatography was discovered by Russian botanist Mikhail Semyonovich Tsvett , who separated plant pigments using calcium carbonate columns (1901) Martin and Synge ( Benzhydrol. and . Benzophenone. by. Thin- Layer Chromatography . Biphenyl, . Benzhydrol. and . Benzophenone. . . Biphenyl. . Benzhydrol. . Benzophenone. Thin- Layer Chromatography. (TLC). A Quick Review….. A bond results from the attraction of nuclei for electrons. All atoms are trying to achieve a . stable octet. IN OTHER WORDS. the protons (. +). in one nucleus are . attracted to the electrons (-). Section 9.1 – Bonding of Atoms. Ionic and Covalent Bonds. Ionic. : Conduct electricity, high MP, high BP, dissolve in water.  . Covalent. : Do not conduct electricity, low MP, low BP, do not dissolve in water. Thursday, April 7, 2011. Liquid. . chromatography. What. . is. . chromatography. ?. Derived from the Greek word . Chroma. meaning . colour. , chromatography provides a way to identify unknown compounds and separate mixtures.