1.In which of the following substances should hydrogen bonding contribute to the

ID: 987311 • Letter: 1

Question

1.In which of the following substances should hydrogen bonding contribute to the attractive interactions in the molecules? In which of the following substances should hydrogen bonding contribute to the attractive interactions in the molecules?

CF4

H2Se

N(CH3)3

None of the above

2.Which of the following changes will result in a net increase in the vapor pressure of a liquid?

decrease in surface area of the liquid increase in temperature replacing the liquid with one with stronger intermolecular forces adding more liquid to the container

Explanation / Answer

Recall that hydrogen bonding is formed only in Hydrogen containing molecules which are bonded directly to O,N,F

therefore, from the list:

CF4 --> no hydrogen

H2Se --> Se is not N,F,O

N(CH3)3 --> no hydrogen

HI --> Iodine is not resent in the list

Therefore, there is NO answer, no hydrogen bonding is formed at all!

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1.In which of the following substances should hydrogen bonding contribute to the

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