2015年11月IB化学SL真题下载-Paper3

2015年11月IB化学SL真题下载-Paper3

1. Infrared (IR) spectroscopy is a powerful analytical technique.

(a) Describe how information from an IR spectrum can be used to identify the bonds in a molecule. 

(b) Explain what happens at the molecular level during the absorption of IR radiation by water.

(c) Explain which of the following compounds would produce the IR spectrum below by referring to the wavenumbers of the relevant peaks found in table 17 of the data booklet.

(d) Explain how the low resolution 1H NMR spectra of the three compounds in part (c) can be used to distinguish between them. Ignore chemical shifts.

(e) The mass spectrum of compound A, CH3CH2CH2CH2COOH, shows significant peaks at mass to charge ratios of 57 and 102. Deduce the formulas of the species responsible for these peaks.

m/z = 57:

m/z = 102:

 

2. Atomic absorption (AA) spectroscopy is used to detect very low concentrations of metal ions.

(a) State one application of AA spectroscopy.

(b) Describe the uses of the fuel and the monochromatic detector in the AA spectrophotometer.

Fuel:

Monochromatic detector:

 

3. Absorption and emission spectra can be used to identify elements.

(a) Distinguish between the processes within the atom that give rise to absorption and emission spectra.

Absorption spectra:

Emission spectra:

(b) Outline how the emission spectrum of a sample of gaseous element is produced.

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