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Unformatted text preview: Answer key Chapter 14 14.13 Hint: Group 1 and group 2 elements reacting with water always give basic solution and hydrogen gas 2K + 2H 2 O --> 2KOH + H 2 Note: For group II elements react with water, don't forget that we need 2OH- to form ionic compound with cation, e.g. Ca + 2H 2 O --> Ca(OH) 2 + H 2 14.15 See pp. 584 for definitions and examples of saline, molecular and metallic hydride. 14.17 (a) NO 2 is an anhydrous form of nitric acid (HNO 3 ). See pp. 629, thus it is acidic. (b) Al 2 O 3 can be both acidic and basic, thus it's amphoteric. See pp 600-601. (c) B(OH) 3 is a lewis acid, it can accept e- from lewis base because B doesn't complete octet yet and e- can be filled in empty p orbital of B. (d) MgO reacts with water and give OH-, thus it's basic. MgO + H 2 O --> Mg(OH) 2 + O 3 Note Alkaline and alkaline earth compounds reacting with water usually give basic solution. Compare 2K + 2H 2 O --> 2KOH + H 2 KH + H 2 O --> KOH + H 2 KO 2 + H 2 O --> KOH + O 3 14.20 (a) N 2 O 5 + H 2 O --> 2HNO 3 (b) P 4 O 10 + 6H 2 O --> 4H 3 PO 4 (c) SeO 3 + H 2 O --> H...
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This note was uploaded on 12/16/2010 for the course CHEM 6C taught by Professor Hoeger during the Fall '08 term at UCSD.
- Fall '08