| Date | May 2017 | Marks available | 2 | Reference code | 17M.3.sl.TZ2.4 |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Explain | Question number | 4 | Adapted from | N/A |
Question
Infrared (IR) spectra can be used to distinguish between various types of plastics. Some simplified IR spectra are given here.
Explain, with a reference to molecular structure, which two of the plastics can not be distinguished by IR spectroscopy.
Markscheme
HDPE AND LDPE «have similar IR»
both are polyethene/polyethylene
OR
only branching differs
OR
same bonds
OR
same bending/stretching/vibrations
Accept “water bottle AND water bottle cap” for M1.
[2 marks]
Examiners report
[N/A]
Syllabus sections
Core » Topic 11: Measurement and data processing » 11.3 Spectroscopic identification of organic compounds
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