Unit 3 Section A Summary HW Problems Pt. 4

#24:
Methane, pentane, hexane, octane

#25:
Branched has a lower boiling point.  Branched has a higher density because it is so compact, and the intermolecular forces are weaker.

#26:
a. Short straight
b. Short branched
c. Short branched

#1:
a. Alphabetical.
b. No, it has no purpose.

#2:
a. Order the data table based on the boiling points.
b. Methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane.

#3:
Methane, ethane, propane, butane.

#4:
It is at or below 22 degrees Celsius.

#5:
None of the substances' boiling points show up between the temperatures.

#6:
The intermolecular forces are strong compared to butane.

#6:
CH3-CH2-CH2-CH3, CH3, CH3-CH2-CH2-CH2-CH3

#7:
a. Heptane, nonane.
b.
CH3-CH2-CH2-CH2-CH2-CH3, CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3

#8:
a. CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH3
b. The condensed is better because it is shorter and easier to write.

#20:
Yes, only the shape has changed.

#21:

CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3


CH3                                                            CH3                                                   CH3
   |                                                                 |                                                       |
CH2                                                              CH2 - CH2 - CH2 - CH2 - CH2 - CH2 - CH2
   |                                                           
CH2                                                               
   |
CH2
   |
CH2 - CH2 - CH2 - CH2 - CH3

#22:
Propane (C3H8)