fstc201 1-23-08

fstc201 1-23-08 - the same molecule NH4HCO3 > NH3 + H2O...

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Food Sciences Week 2 Wednesday, January 23, 2008 A chemical reaction results in formation of new substance(s) having different properties from reactants . Chemical leavening agent leavening gas Why is chemical bonding important? FSTC Students learn symbols, formulas, equations, and about chemical bonding. Helps us understand Nutrient metabolism Food fermentation reactions Formulation of nutraceutical foods Food ingredient functionality Chemical bonds : forces that hold atoms within molecules together Only electrons (not neutrons or protons) are involved in chemical bonding Propionic acid, a preservative Used in bread, anti-molder Which atoms are bonded together in this molecule? CH 3 CH 2 COOH H H O | | || H – C – C – C – O – H | | H H Be able to look at that and make the association Food bonds may be “single” (C-C) or “double” (C=C) Food bonds may be covalent or ionic 1. Most food bonds are covalent bonds if they contain carbon 2. Any minerals or salts involve mostly ionic bonds 3. Intra molecular bonds: are bonds within
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Unformatted text preview: the same molecule NH4HCO3 > NH3 + H2O + CO2 a. Like the bonds between the two hydrogen and oxygen elements in a water molecule 4. Inter molecular bonds: are bonds between two separate molecules a. Like a hydrogen bond connecting water molecules Ionic Bonds Electrons are transferred between atoms Atoms become positively charged if donate e- or negatively charged if accept e-These are properly termed ions: cations (+) and anions (-) Anions: CI-, I-, HCO 3-, NO 2- (nitrite) Cations: NA + , K + , CA ++ , Mg ++ , Fe ++ Na+ ions (cations) alternate with Cl- (anions) in three dimensions within a crystal lattice structure The ionic attraction can be considered another example of intramolecular bonding, even though we are dealing with an ionic structure, not a molecule Intermolecular Bonds Hydrogen bonding is between an O or N atom of one molecule and H of another and is a type of covalent bond (separated in space) Na + Cl-...
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This note was uploaded on 03/25/2008 for the course FSTC 201 taught by Professor Murano during the Spring '08 term at Texas A&M.

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fstc201 1-23-08 - the same molecule NH4HCO3 > NH3 + H2O...

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