A gas chromatogram is a chart that represents different substances in a mixture - OCR Gateway - GCSE Chemistry - Question 14 - 2018 - Paper 1
Question 14
A gas chromatogram is a chart that represents different substances in a mixture.
Which of the following statements about a gas chromatogram is not correct?
A. A ga... show full transcript
Worked Solution & Example Answer:A gas chromatogram is a chart that represents different substances in a mixture - OCR Gateway - GCSE Chemistry - Question 14 - 2018 - Paper 1
Step 1
A. A gas chromatogram can detect very small amounts of substances.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is correct. Gas chromatography is indeed capable of detecting trace amounts of different substances in a mixture.
Step 2
B. One compound produces several peaks.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is not correct. In gas chromatography, one compound typically produces one distinct peak. Multiple peaks may indicate the presence of multiple components in the mixture.
Step 3
C. The area of each peak shows the relative amount of each substance.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is correct. The area under each peak in a chromatogram is proportional to the amount of that substance present.
Step 4
D. The retention time is different for different substances.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is also correct. In gas chromatography, different substances have different retention times, allowing them to be distinguished from one another.
