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105 F11 Lecture 15 cmpd

105 F11 Lecture 15 cmpd - • Two allotropes Ø O2 Ø O3...

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Which is the acetate ion? A. C2O4- B. C2O42- C. HCO3- D. C2H3O2- E. C2H3O22-
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Today’s focus A brief look at some periodic properties and representative reactions.
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Periodic properties - alkali metals “Exist in nature as compounds” – why? Low ionization energies. Identification - Flame tests
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Alkali metals react with water Alkali metals movie
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*Alkali metal reactions w/ O2 Metal Oxide Ø 4 Li (s) + O2 (g)  2 Li2O (s) Metal Peroxide Ø 2 Na (s) + O2 (g)  Na2O2 (s) Metal Superoxide Ø K (s) + O2 (g)  KO2 (s)
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Alkaline Earth Metals How reactive would you expect the alkaline earths to be in comparison to alkali metals?
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Group 6A - Chalcogens Oxygen, sulfur, and selenium are nonmetals . Tellurium is a metalloid . The radioactive polonium is a metal .
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Oxides *Metal oxides are basic Ø CaO + H2O  ? Ø Indicator is phenolpthalein Pink is basic Colorless is neutral or acidic *Non-metal oxides - acidic Ø CO2 + H2O  H2CO3
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Unformatted text preview: • Two allotropes: Ø O2 Ø O3, ozone • Three anions: Ø O2−, oxide Ø O22−, peroxide Ø O21−, superoxide • Tends to be an oxidizing agent Flaming ping pong ball of death Sulfur • Most stable allotrope is S8, a ringed molecule. Group VIIA: Halogens • Characteristically high ionization energies • Highly negative electron affinities Group VIIA: Halogens • Large, negative electron affinities Ø Therefore, tend to oxidize other elements easily • React directly with metals to form metal halides Ø Na (s) + Cl (s) NaCl (s) Reactive! • Chlorine gas • Hydrogen and chlorine • Aluminum bromide Sometimes H is found above alkali metals, other times above halogens. Why? Ø Electron config.? Ø IE? Ø EA? Homeless hydrogen Group VIIIA: Noble Gases Why are noble gases naturally monatomic gases? Is there anything that reacts with noble gases?...
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