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Topic 4: Chemical bonding

28. Intermolecular forces: Relating molecular polarity to physical properties

1. The abnormally high boiling point of HF as compared to HCl is primarily due to intermolecular forces
of attraction called

1) Network bonds 3) Electrovalent forces
2) Van der waals forces
4) Hydrogen bonding

2. At 298 K, the vapor pressure of H2O is less than the vapor pressure of CH3OH because H2O has
3) Stronger intermolecular forces

1) Larger molecules

2) Smaller molecules 4) Weaker intermolecular forces

3. The relative high boiling point of water is primarily due to the presence of
1) Hydrogen bonds 3) metallic bonding
2) Covalent bond 4) Network solid bonding
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4. Compare to the boiling point of H2S, the boiling point of H2O is higher because H2O molecules
1) Have less mass than H2S molecules
2) Have smaller van der waals forces than H2S molecules
3) Form stronger hydrogen bond bonds than H2S
4) Form stronger covalent bonds than H2S

5. At STP, fluorine is a gas and iodine is a solid. This observation can be best explained by the fact that
fluorine has
1) Weaker intermolecular forces of attraction than iodine
2) Stronger intermolecular forces of attraction than iodine
3) Lower average kinetic energy than iodine
4) Higher average kinetic energy than iodine

29. Boiling and melting points: Determining formula with highest and lowest boiling point

1. Which of the following compounds has the highest normal boiling point? 4) H2Te (l)
1) H2O (l)

3) H2Se (l)
2) H2S (l)

2. Which of these compounds would have the highest boiling point? 4) HF

2) HBr

1) HI
3) HCl

3. Which of these nonpolar substances at STP likely has the highest boiling point? 4) F2

2) Br2

3) Cl2
1) I2

4. Which of these noble gases elements has the highest boiling point? 4) Xe

2) Ar

3) Kr
1) Ne

5. Which hydrocarbon likely has the highest boiling point? 3) C4H10
2) CH4 4) C3H8
6. Which of the followings has the lowest boiling point?
1) He 2) Xe 3) Ne 4) Kr

7. Which of the following substance has the lowest normal boiling point?
1) C5H10 2) C4H8 3) C3H6 4) C2H4

8. Which of these halogens has the lowest melting point?
1) Br2(s) 2) I2(s) 3) Cl2 (s) 4) F2(s)

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