Chemistry of Life Week 5 notes
Chemistry of Life Week 5 notes CHEM 120 - 04
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CHEM 120 - 04
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This 5 page Class Notes was uploaded by Samantha Weller on Sunday October 4, 2015. The Class Notes belongs to CHEM 120 - 04 at Radford University taught by Lissa F Huston in Summer 2015. Since its upload, it has received 19 views. For similar materials see Chemistry of Life in Chemistry at Radford University.
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Date Created: 10/04/15
Chemistry of Life Week 5 Notes Diatomic Molecules There are 7 elements that exist in nature as diatomic molecules H2 02 N2 392 BF F2 N O F Cl Br amp l for a 7 on the periodic table of elements amp H is the rst element Octot Rule atoms will lose gain or share electrons in order to achieve a noble gas con guration eight electrons Exceptions atoms such as P S Cl Br and I can form compounds with 10 or 12 valence electrons Electronegativity The ability of an atom to attract itself toward the electrons in a chemical bond Eectronegativity increases from left to right and decreases from top to bottom on the periodic table F has the most electronegativity Writing Lewis Structure 1 Draw skeletal structure of a compound showing what atoms are bonded to each other Put the least electronegative element in the center H l HNH Doesn t matter how they re arranged as long as there s 3 around 2 Count total number of valence electrons Add 1 for each negative charge and subtract 1 for each positive charge N 5e H 1e 3 3e 8e 3 Place the valence electrons around outside atoms rst to complete an octet Place remaining electrons around the central atom H can only have 2 electrons Be4 B amp AI 6 H l HNH l 2 shared electrons 4 If there are not enough electrons to give to the central atom an octet then forms double and triple bonds as needed 5 Check the number of electrons Covalent Bonding Why should two atoms share electrons 391 if Ill F F F F 39l quot II II electrciin pair shared between the twin fluorliine atoimie two atoms share two pairs of electrons 0 0 3quot 2 31 Q two atoms share 3 pairs of electrons i i Naming Molecules Binary molecular compounds consists of 2 different nonmetal elements To name Binary Molecular Compounds 1 Begin with the name of the rst element in the formula 2 Change the ending of the name of the second element to ide 3Add pre xes to the rst and second names to indicate the number of atoms of each type in the molecule don t use mono on 1St element Pre xes for Molecular Compounds 1 Mono 2 Di 3 Tri Tetra Penta Hexa Polar bonds electrons are shared equally by two bonded atoms electrons are shared unequally by two bonded atoms 2 of the same nonmetals nonpolar bonds 2 different nonmetas polar bond a metal and nonmeta ionic Polar Molecules Depends not only on the polarity of the bonds but the molecular geometry The HF bond is polar and HF has a dipole moment Bond dipoles are vectors and therefore are addictive 8 8 H 39 Fl more electronegative atom
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