Page 408 - Chemistry eBook

Sample Regents Questions
Base your answers to questions 63 through 65 on the information below and on your knowledge of chemistry.
There are several isomers of C6H14. The formulas and boiling points for two of these isomers are given in the table below.
Isomer
Formula
Boiling Point at 1 atm (°C)
1
HHHHHH HCH HHHHHH
C
C
CCC
68.7
2
C
H HCH
HHH
HCCH
HHH HCH
H
C
49.7
63 Identify the homologous series to which these isomers belong. [1]
64 Write the empirical formula for isomer 1. [1]
65 Explain, in terms of intermolecular forces, why isomer 2 boils at a lower temperature
Answer: Alkanes -OR-
CnH2n+2
P.S./Chem.–June ’13
than isomer 1.
[1]
June 2013 #63
Answer
[11] [OVER]
Explanation: The formula of these isomers is C6H14, which fits the general alkane formula found on
Reffy, Table Q (p. 7).
Also, there are only single carbon bonds in these compounds, which means that they are alkanes.
We will learn more about isomers
later in this chapter.
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