1. Polarity and Physical Properties Review

2. Which of the following bonds is most polar?
Br-Cl
Br-F
I-Cl
I-F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

3. If X has a higher electronegativity than Y, which of the following is true
Y will have positive charge
X will have a positive charge
Both X and Y will have a negative charge
Neither atom will have a charge. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

4. The ammonia molecule, NH3, is:
Asymmetrical and polar
Symmetrical and non- polar
Asymmetrical and non- polar
Symmetrical and polar 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

5. The carbon dioxide molecule, CO2, is:
Asymmetrical and polar
Symmetrical and non-polar
Asymmetrical and non-polar
Symmetrical and polar 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

6. A molecule with polar bonds is always polar.
True
False 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

7. The intermolecular force experienced by polar molecules is
Ionic bonding
Dipole-Dipole Force
Dispersion force
Ion-dipole force 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

8. The intermolecular force experienced by non-polar molecules is
Ionic bonding
Dipole-Dipole Force
Dispersion force
Ion-dipole force 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

9. The strongest type of intermolecular force is
Covalent Bonding
Dispersion force
Dipole-Dipole Force
Hydrogen Bonding 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

10. The strongest type of intermolecular force experienced by HCl is
Dispersion force
Dipole-Dipole Force
Hydrogen Bonding 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

11. Which of the following is not an intermolecular force
Hydrogen Bond
Dipole-Dipole Force
Dispersion Force
Covalent Bond 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

12. Which is the strongest intermolecular force experienced by ammonia?
Hydrogen Bonding
Dipole-Dipole Forces
Dispersion Forces
Polar bonding 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

13. Which is the strongest intermolecular force experienced by CO2?
Hydrogen Bonding
Dipole-Dipole Forces
Dispersion Forces
Polar Bonding 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

14. The green dashed lines in the diagram could represent all of the following except...
Hydrogen Bonds
Intermolecular forces
Covalent bond
Dipole-dipole force 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

15. What type of bond breaks when water boils __?
Green dashed lines
Solid red lines
Both dashed and solid lines
None of the above 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

16. Which picture accurately portrays what occurs when ice melts into a liquid.1 2 3
Choice One
Choice Two
Choice Three 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

17. Which picture accurately portrays what occurs when solid becomes a gas?1 2 3
Choice One
Choice Two
Choice Three 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

18. Bonding between two elements of equal electronegativity would be
100% covalent
Primarily Ionic
50% Ionic
Metallic in character 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

19. The type of bond in a compound containing G and E would be
A metallic bond
A nonmetallic bond
A covalent bond
An ionic bond 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

20. Which of the following is likely to be a solid at room temperature?
A small molecule with only non-polar covalent bonds
A large molecule with many O-H bonds.
A small molecule with some polar bonds and some non-polar bonds. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

21. If the difference in electronegativity between atoms of different non-metals is small, the atoms of the two non-metals will most likely –
Form an ionic bond
Form a hydrogen bond
Form a covalent bond
Form a metallic bond 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

22. If the electronegativity difference between two non-metals is 1
If the electronegativity difference between two non-metals is 1.7, the bond will most likely be
Hydrogen bond
Non-polar bond
Polar bond
Dipole-dipole bond
Ionic bond 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

23. Which of the following is most likely the electronegativity value for chlorine?
3.5 F
4.0 S
2.5 Cl ? Se
2.4 Br
2.8
2.3
2.7
3.0
4.2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

24. As heat is added to a substance undergoing a phase change, the temperature remains constant because the energy is being used to ---
Break covalent bonds
Lower the specific heat capacity
Overcome intermolecular forces
Oppose electron cloud repulsions. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

25. Have stronger intermolecular attractions
Molar Heat of Vaporization H2O = 40.7 kJ/mol NH3=23.4 kJ/mol Water and ammonia have different molar heats of vaporization. The best interpretation, at the molecular level, is that water molecules
Have stronger intermolecular attractions
Occupy larger molecular volumes
Set up stronger repulsive nuclear forces
Collide more frequently with each other 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

26. Sodium chloride conducts electricity when dissolved in water
Sodium chloride conducts electricity when dissolved in water. What type of bond is present in NaCl?
Nonpolar covalent
Polar covalent
Hydrogen
Ionic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

27. Molecules with hydrogen bonding have higher _______ than molecules with dispersion forces
Surface tension
Boiling points
Heats of fusion
1 and 3 only
1,2 and 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

28. Which of the following will have the lowest melting point and likely be a gas at room temperature
Non-polar compounds
Polar compounds
Ionic compounds
Metallic compounds 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

29. Which of the following diatomic gases will have the weakest dispersion forces?
Chlorine
Hydrogen
Iodine
Oxygen 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

30. Which of the following diatomic gases will have the lowest boiling point?
Chlorine
Hydrogen
Iodine
Oxygen 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

31. Which of the following will evaporate the slowest?
Ammonia, because it can hydrogen bond
Formaldehyde which has dipole-dipole forces
Propane which as dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

32. Two liquids will be miscible if
At least one is capable of hydrogen bonding.
They are both polar.
One is polar and the other is non-polar.
One has stronger intermolecular forces than the other. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

33. The rule “like dissolves like” refers to
Substances with charges will be soluble in one another
Substances with the same intermolecular forces will mix
Substances that are both capable of hydrogen bonding will be miscible
All of the above. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

34. Substance A is more viscous than substance B, therefore
A has stronger intermolecular forces than B because A will flow more easily than B
A has weaker intermolecular forces than B because A will flow more easily than B
A has stronger intermolecular forces than B because A will not flow as easily well as B
A has weaker intermolecular forces than B because A will not flow as easily well as B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

35. Which of the following has the highest volatility?
Molecules with hydrogen bonding
Molecules with dipole-dipole forces
Molecules with dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

36. Which of the following has the highest vapor pressure?
Molecules with hydrogen bonding
Molecules with dipole-dipole forces
Molecules with dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

37. Which of the following has the highest heat of fusion?
Molecules with hydrogen bonding
Molecules with dipole-dipole forces
Molecules with dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

38. Which of the following has the highest heat of vaporization?
Molecules with hydrogen bonding
Molecules with dipole-dipole forces
Molecules with dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

39. Which of the following has the highest heat of vaporization?
Molecules with hydrogen bonding
Molecules with dipole-dipole forces
Molecules with dispersion forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

40. Which of the following has the highest vapor pressure?
ethanol
acetone
Water
syrup 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24