Lec13-chem

Lec13-chem - Review Size matters within the periodic trends...

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When a covalent oxide is dissolved in water an acidic solution is formed: CO 2 (g) + H 2 O(l) H 2 CO 3 (aq) Review Size matters within the periodic trends DEMO!
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Group I elements (alkali metals) Their reactions with O 2 : Li and H are the only two elements in group I to form X 2 O species with O 2 (g): 2H 2 (g) + O 2 (g) 2H 2 O(g) 4Li(s) + O 2 (g) 2Li 2 O(s) Both of these are as one would expect.
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With excess O 2 (g): 2Na(s) + O 2 (g) Na 2 O 2 (s) Sodium peroxide 0 0 + 1 - 1 Na 2 O 2 (s) + 2H 2 O(l) 2Na + (aq) + H 2 O 2 (aq) + 2OH - (aq) Hydrogen peroxide
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K, Rb, and Cs react with O 2 to form superoxides K(s) + O 2 (g) KO 2 (s) Rb(s) + O 2 (g) RbO 2 (s) Cs(s) + O 2 (g) CsO 2 (s) 0 0 + 1 - 1 / 2 When reacted with water, superoxides form O 2 (g) 2MO 2 (s) + 2H 2 O(l) 2M + (aq) + OH - (aq) + O 2 (g) + H 2 O 2 (aq)
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Summary M 2 O Oxide H 2 O, Li 2 O, and Na 2 O * M 2 O 2 Peroxide H 2 O 2 , Na 2 O 2 MO 2 Superoxide KO 2 , RbO 2 , CsO 2 *Na can form Na 2 O when exposed to small amounts of O 2 (g) (air has a large amount of O 2 )
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Use of superoxides: KO 2 (s) is used to produce O 2 (g) in re- breathing apparatuses
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2 (g). The following reaction occurs with KO 2 (s): 4KO 2 (s) + 2CO 2 (g) 2K 2 CO 3 (s) + 3O 2 (g) Used to breathe Gas is not emitted like typical SCUBA tanks. S
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This note was uploaded on 03/21/2009 for the course CHEM 6C taught by Professor Hoeger during the Spring '08 term at UCSD.

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Lec13-chem - Review Size matters within the periodic trends...

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