Posted by Shadow on Sunday, March 10, 2013 at 10:50pm.
I was taught that hydrogen bonds are actually very weak, but it may just be a matter of different teachers. I would answer C) Covalent Bonding because they SHARE an electron keeping them very close and tight.
The answer is A because of hydrogen bonding. Hydrogen bonds are a weak bond; i.e., only about 1/5 as strong as a regular covalent bond. But if you look at the series H2O, H2S, H2Se, H2Te, the boiling points go like this
H2Te > H2Se > H2S <<<<H2O. All have covalent bonds but only H2O has hydrogen bonding. The same phenomenon occurs for the series NH3 and below and HF and below. For example, HI is a solid, HBr a gas, HCl a gas, HF (b.p. 67) which is a liquid with a relatively high boiling point but we would expect it to be a gas. H2O we would expect to be a gas also.
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