Unit 3 Sec. A Summary HW 4

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24) Methane (CH₄), pentane (C₅H₁₂), hexane (C₆H₁₄), and octane (C₈H₁₈). It’s ranked in this order because it’s in order of the alkane series.

25) a.

b. The branched-chain molecule because the molecules are more condensed.

26) a. A short, straight chain because it has less molecules.

b. A long, branched chain because it is more condensed.

c. A short, branched chain because it is more condensed. 

Section A.8

1) a. Table 3.3 is organized in alphabetical order.

b. No, because the boiling point and the molecular formula is not written in increasing order.

2) a. A more useful way would be by ordering the table in order of the total number of carbon atoms.  

b. The table would look like table 3.4 with the hydrocarbon names in the order: methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, and decane.

3) Methane, ethane, propane, and butane.

4) The boiling point would be less than 22 degrees Celsius.

5) Pentane

6) The decane molecules are stronger with more carbon atoms than butane molecules.

Section A.9

6) Butane C₄H₁₀ Pentane C₅H₁₂

7) a. i. Heptane

ii. Nonane

b. C₇H₁₆ and C₉H₂₀

8) a. C₂₅H₅₂

b. The molecular formula because it is smaller and easier to write.