4.2.4 Modern Analytical Techniques

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A-Level Chemistry

OCR

Core Organic Chemistry

Last updated 9:50 PM on 9/6/26
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5 Terms

1
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Are covalent bonds static?

  • No they are not

  • They are constantly vibrating


2
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What happens when a molecule is exposed to infrared radiation of the correct frequency?

  • The bond absorbs energy and moves to a higher vibrational energy level

  • So it vibrates with greater amplitude


3
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<p>Fill in the blank</p>

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4
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For IR radiation what does each type of bond (e.g. O-H, C=O) absorb?

A characteristic frequency (wavenumber) that varies only slightly between compounds.

5
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Describe fingerprint region

A crowed region caused when motions of the whole molecule (bending, rocking, scissoring, twisting) also absorbs IR, producing extra peaks below 1500cm−1-1

<p>A crowed region caused when motions of the whole molecule (bending, rocking, scissoring, twisting) also absorbs IR, producing extra peaks below 1500cm$$-1$$ </p>