low octane and high octane what makes up the difference
2007-02-02 11:31:46 · 4 answers · asked by CRANE 1 in Science & Mathematics ➔ Chemistry
Octane is just a eight carbon alkane with the formula C8H18. Low octance and high octane are terms related to gasoline, it has nothing to do with the molecule itself. Octane is added to gasoline to prevent engine knocking. Low and high octane refers to how much octane is added.
2007-02-02 11:38:19 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Actually, octane does refer to enginge knocking as a result of the type of gasoline used. A high octane rating indicates that there is a high degree of branching in the alkane used- for example t-butane has a higher octane rating than n-butane, because the t-butane has a branched methyl group at carbon #2, whereas n-butane is a straight chain.
Octane the alkane itself is an 8-carbon straight chain that is like any other alkane in the homologous series. It is fairly unreactive. It can ract, however, through free-radical halogenation and with oxygen through combustion. It is a nonpolar organic molecule.
2007-02-02 21:24:17 · answer #2 · answered by Joshua B 2 · 0⤊ 0⤋
Synonyms: Normal octane; n-octane
CAS No.: 111-65-9
Molecular Weight: 114.23
Chemical Formula: CH3(CH2)6CH3
Physical and Chemical Properties
Appearance:
Clear, colorless liquid.
Odor:
Gasoline-like odor.
Solubility:
Essentially insoluble in water.
Density:
0.7 20/4C
pH:
No information found.
% Volatiles by volume @ 21C (70F):
100
Boiling Point:
126C (259F)
Melting Point:
-57C (-71F)
Vapor Density (Air=1):
3.9
Vapor Pressure (mm Hg):
14 @ 25C (77F)
Evaporation Rate (BuAc=1):
1.4
2007-02-02 19:38:21 · answer #3 · answered by moomintroll77 2 · 0⤊ 0⤋
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2007-02-02 19:35:09 · answer #4 · answered by Anonymous · 0⤊ 1⤋