Lecture 3 8:28:2017.pdf - Chem 203Lg Lecture#3 Basic...

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Chem 203Lg Lecture #3 Basic Organic Chemistry II Tuesday, August 30th Monday, August 28, 17
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Genes Function Understanding molecules HIV O HO N N N N NH 2 OH N H O H N O N H OH O O HN S CF 3 O O OH Monday, August 28, 17
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Review of the ionic bond Na F Lose 1 electron Gain 1 electron F - Na + Monday, August 28, 17
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Review of the ionic bond Na F Lose 1 electron Gain 1 electron F - Na + Opposites attract to give NaF salt Monday, August 28, 17
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Periodic Trend: Electronegativity H He Li Be B C N O F Ne Na Mg P S Cl Ar K Ca Br I Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Phosphorus Sulfur Chlorine Argon Potassium Calcium Bromine Iodine 1 2 3 4 5 6 7 8 9 10 11 12 15 16 17 18 19 20 35 53 Electronegativity 2.10 0.98 0.93 0.82 1.00 1.31 1.57 2.04 2.55 3.04 2.19 3.44 2.58 3.16 3.98 2.96 2.66 0.00 0.00 0.00 Monday, August 28, 17
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The covalent bond F F What happens when atoms don’t seem to be a good match? ? Monday, August 28, 17
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The covalent bond F F Atoms can share an electron 50% 50% F F Sharing of electrons is a covalent bond F F F 2 Monday, August 28, 17
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Ionic bonds vs covalent bonds How do we know whether we will get an ionic or covalent bond? In an IONIC BOND, one atom gives up electrons to become a cation and one atom takes electrons to become an anion . IONIC BONDS are formed between elements with very di ff erent electronegativities. In a COVALENT BOND, the electrons are shared . COVALENT BONDS are formed between elements with similar electronegativities. Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons C C Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons C C H Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons C C H C H Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons C C H C H H x 3 Monday, August 28, 17
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The atoms of organic chemistry Carbon and hydrogen H C Wants 1 electron Wants 4 electrons C C H C H H x 3 C H H H H CH 4 = Methane Monday, August 28, 17
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Other combinations of carbon and hydrogen C H H H H Methane C H C H H H H H Carbon-Carbon single bond Carbon-Carbon double bond C C H H C C H H H H Carbon-Carbon triple bond Monday, August 28, 17
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Other combinations of carbon and hydrogen C H H H H Methane C H C H H H H H Carbon-Carbon single bond Carbon-Carbon double bond C C H H C C H H H H Carbon-Carbon triple bond Molecules are 3D - What do they actually look like?
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