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CHEM 300
Sacramento City College
Chapter 12
Chapter 12 Homework
Chemical Species/Chemical Interactions:
1. State whether each solid is molecular, atomic, or ionic.
a.) Cu(s)
b.) H2O(s)
c.) NaCl(s)
d.) Fe(s)
2. What is a molecular solid? What makes them different than an atomic or ionic solid?
Intermolecular Forces:
3. Identify the strongest intermolecular force present in each of the species:
a.) CH4
b.) HF
c.) H2O
d.) CHCl3
4. What intermolecular force do ALL species have?
5. List ALL of the intermolecular forces present in the following molecules:
a.) CH3CH2OH
b.) CCl4
c.) CHF3
6. Identify the strongest intermolecular force in each molecule:
a.) NH3
b.) HCl
7. Under what circumstances is a hydrogen-bond present?
8. Identify the strongest intermolecular force present in the following molecules:
a.) CO2
b.) O2
c.) Ni
d.) CH3CHO2
CHEM 300
Sacramento City College
Chapter 12
9. List the following molecules in order of increasing dominant intermolecular force:
HF , CH4, CH3CHO2
10. List the following molecules in order of decreasing dominant intermolecular force:
NH3 , CH3CH2CH3 , HCl
11. List all of the intermolecular forces present in each of the following substances:
a.) copper (s)
b.) phosphoric acid
c.) selenium difluoride
d.) butane
12. Circle the dominant intermolecular force for the compound: CH3OCH3
a.) Dispersion
b.) Dipole-Dipole
c.) H-Bond
13. All of the following molecules have hydrogen-bonding forces, EXCEPT…
a.) HF
b.) HCl
c.) H2O
d.) NH3
14. All of the following molecules have dipole-dipole forces, EXCEPT…
a.) CH4
b.) CH3OCH2CH3
c.) CH3OCH3
d.) HF
15. All of the following molecules have dispersion forces as their DOMINANT
intermolecular force, EXCEPT…
a.) CF4
b.) CCl4
c.) CH3CH2CH2CH2CH3
CHEM 300
Sacramento City College
Chapter 12
d.) CH2Cl2
Boiling/Melting Point:
16. By looking at the Lewis structure of a molecule, how would you know which one will
have the higher boiling point?
17. Circle which molecule will have the higher boiling point:
a.) CH4
b.) CH3CH3
18. Given the following substances, list them in order of decreasing boiling point:
NaCl , CH3CH2OH , Ar , CHCl3
19. At room temperature, CO2 is in its gas form, while CH3OH is in its liquid form. Explain
why.
20. List the following noble gases in order from decreasing to increasing boiling point:
Kr , He , Ar , Xe , Rn , Ne
21. When comparing NaCl and CH4, which molecule will have the higher melting point?
22. When comparing potassium solid with neon solid, which one will have the higher
melting point?
23. Circle the molecule with the highest melting point:
a.) NH4Cl
b.) CH3OH
c.) HF
24. Circle the molecule with the highest boiling point:
a.) CH3CH2CH2CH2CH3
b.) CH3CH2CH2CH2CH2CH2CH3
c.) CH3CH3
25. Determine which one will have the higher boiling point.
a.) methanol
b.) carbon dioxide
26. Determine which one will have the higher boiling point.
CHEM 300
Sacramento City College
Chapter 12
a.) H2
b.) HCl
27. Which substance will have the lowest boiling point?
a.) H2O
b.) Ne
c.) NH3
d.) NaF
28. Arrange the list of acids in order of highest to lowest melting point.
HCl , HI , HBr
29. Compare H2O(s) and H2S(s). Which molecule will have the higher melting point? Why?
30. Arrange the molecules in order of increasing to decreasing boiling point:
Hexane (C6H14), Octane (C8H18), Butane (C4H10)
31. From the choices below, which one would have the lowest boiling point?
a.) C5H12
b.) C10H22
c.) C2H2
32. Ethanol (CH3CH2OH) and propane (C5H12) have similar molar masses. Does that mean
they will have the same boiling point? Explain.
33. For each of the pairs below, circle the substance with the higher boiling point:
a.) I2 and F2
b.) HF and LiF
c.) CH2O2 and CCl4
34. For each of the pairs below, circle the substance with the higher boiling point:
a.) propanol and methanol
b.) methane and pentane
c.) dihydrogen monoxide and titanium (s)
35. Arrange the following substances in order from decreasing to increasing boiling points:
CHEM 300
Sacramento City College
Chapter 12
acetic acid (CH3COOH), acetone (C3H6O), water (H2O)
36. Which substance would most likely be a liquid at room temperature, CH3COOH or CCl4?
37. From the following molecules, which one will have the highest boiling point? Which one
will have the lowest boiling point?
a.) CH3CH2CH2CH3
b.) CH3CH2CH2CH2CH2CH2CH2CH3
c.) CH3CH2CH3
d.) CH3CH2CH2CH2CH2CH3
38. For the pair below, which one will have a higher boiling point? Explain.
CH3CH2COH or CH3CH3
39. From the following molecules, which one will have the higher boiling point?
a.) CH3CH2CH2COH
b.) CH3CH2CH2CH3
c.) CH4
Cumulative/Challenge Problems:
40. The Lewis structure for acetone is provided below. Can a hydrogen-bond form if you
were to allow two acetone molecules to bond together? Explain.
41. Could a water molecule form a hydrogen bond with an acetone molecule? Explain. (The
Lewis structure provided in the previous problem may be helpful)
42. The Lewis structures for butane and iso-butane are provided below. Which molecule
will have the higher boiling point? Do they have the same boiling point because each
molecule has the same amount of carbons and hydrogens? Explain.
CHEM 300
Sacramento City College
Chapter 12

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