Infrared Spectroscopy (AQA A-Level Chemistry): Quizzes

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Infrared Spectroscopy
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What does an infrared spectrum plot absorption against?

Wavenumber (cm−1^{-1})

What factors determine the vibrational frequency of a bond in IR spectroscopy?

Mass of atoms & bond strength/length

Where is the fingerprint region located on an IR spectrum?

Below 1500 cm−1^{-1}

Where is the functional group region located on an IR spectrum?

Above 1500 cm−1^{-1}

At what wavenumber does a C−HC-H stretch typically appear?

Just under 3000 cm−1^{-1}

What type of peak indicates an O−HO-H stretch in alcohols?

Broad peak between 3230-3550 cm−1^{-1}

What type of peak indicates a C=OC=O stretch (carbonyl group)?

Sharp peak between 1680-1750 cm−1^{-1}

Where does the O−HO-H stretch appear in carboxylic acids?

Very broad peak: 2500-3000 cm−1^{-1}

How is the fingerprint region used to confirm the identity of a compound?

Compare it with a known pure sample

How do greenhouse gases like CO2CO_2 and CH4CH_4 contribute to global warming?

They absorb IR radiation & trap heat

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