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The above diagram shows the gas chromatogram of a sample containing four straight chain alkanes - VCE - SSCE Chemistry - Question 6 - 2009 - Paper 1
Question 6
The above diagram shows the gas chromatogram of a sample containing four straight chain alkanes. The following statements refer to this chromatogram. I The boilin... show full transcript
Worked Solution & Example Answer:The above diagram shows the gas chromatogram of a sample containing four straight chain alkanes - VCE - SSCE Chemistry - Question 6 - 2009 - Paper 1
Step 1
I The boiling points of the compounds arranged from highest to lowest are Z > Y > X > W.
Answer
This statement is true. In a gas chromatogram, compounds with higher boiling points elute later. Given the peak areas, Z has the highest area, followed by Y, then X, and W has the lowest area, consistent with their boiling point trend.
Step 2
II The retention times will stay the same if the temperature at which the chromatogram is recorded is increased, all other conditions remaining constant.
Answer
This statement is false. Generally, increasing the temperature of the column will decrease the retention times, as the compounds will vaporize and elute more quickly.
Step 3