2012年11月IB化学SL真题下载-Paper3
A1. The diagram below represents a simple double-beam infrared (IR) spectrometer.
(a) Describe briefly the function of the following components of the spectrometer.
Monochromator:
Splitter:
Reference:
(b) Identify the component of the spectrometer marked X.
A2. The IR spectrum below represents one of the three organic compounds: propan-1-ol (CH3CH2CH2OH), propanal (CH3CH2CHO) or propanoic acid (CH3CH2COOH).
(a) Analyse the spectrum and identify two bonds other than C–H that are present and one that is absent in this compound. Refer to Table 17 of the Data booklet to complete the table.
(b) The mass spectrum of the same compound contains strong peaks of (Mr–15)+ and (Mr–17)+ ions. The first signal corresponds to the loss of a methyl group, CH3, from the molecule. Deduce which fragment is lost to produce the second peak.
(c) Using the information above, deduce the identity of the organic compound.
(d) Predict the number of peaks in the 1H NMR spectrum of this compound.
A3. Magnetic resonance imaging (MRI) is a medical application of NMR spectroscopy.
(a) State one advantage of MRI over X-ray medical imaging with reference to the electromagnetic spectrum.
(b) Outline how MRI is used to scan the human body.
A4. Chromatography is one of the most universal analytical techniques.
(a) State one qualitative and one quantitative use of chromatography.
Qualitative:
Quantitative:
(b) Using column chromatography as an example, explain how components of a mixture interact with the stationary and mobile phases, and explain how the separation of the components is achieved.
2012年11月IB化学SL真题余下省略！
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