Question

Which pair of molecules can form a hydrogen bond? a) HCN, HCl b) CH4, NH3 c)...

Which pair of molecules can form a hydrogen bond?

a) HCN, HCl

b) CH4, NH3

c) CO2, H2S

d) NH3, H2O

Which of the following molecules would you predict to have the weakest intermolecular force of attraction: water, isopropanol, pentane, or acetone?

a) acetone

b) water

c) isopropanol

d) pentane

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Homework Answers

Answer #1

Q1. which pair of molecules can form a hydrogen bond? (d) NH3 , H2O

Q2. weakest intermolecular force of attraction? (d) pentane

Explanation

Q1. Only 3 atoms in the whole periodic table can form hydrogen bonds. These are nitrogen (N) , oxygen (O) and fluorine (F). When a hydrogen atom is directly attached to these atoms, then the bond is known as hydrogen bond.

Q2. Pentane is pure hydrocarbon compound which has only London dispersion intermolecular force of attraction which is the weakest intermolecular force of attraction. Other three remaining compounds have forces of attraction that are stronger than London dispersion forces

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