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Chapter 10B - Infrared Radiation

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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

What is Infrared Radiation?

Back (Answer)

• involves interaction of IR w/ matter wavelength: 700nm-1mm • qualitative analysis technique for functional groups, carbon bonds & types of covalent bonds

#2
Front (Question)

How does Infrared Radiation work?

Back (Answer)

• IR energy not enough to promote electrons to higher energy levels • Enough to cause covalent bonds to bend & stretch • Stretch/bend/vibration of covalent bond produces vibrational energy levels

#3
Front (Question)

What does amount of IR energy absorbed or released depend on?

Back (Answer)

• types of bonds (polarity) • environment • other bonds in molecule

#4
Front (Question)

Infrared spectrum

Back (Answer)

x-axis = wavenumber y-axis = transmittance - trough/peak appears when energy absorbed by a covalent bond - deeper peak = stronger the absorbance

#5
Front (Question)

Transmittance

Back (Answer)

opposite of absorbance 100% transmittance = no light absorbed

#6
Front (Question)

Fingerprint region

Back (Answer)

500-1400cm-1 - qualitative - identify compound by comparing spectrum of unknown with known

#7
Front (Question)

How does Infrared Radiation work?

Back (Answer)

• wavelength within IR region of electromagnetic spectrum strongly absorbed by particular covalent bond • molecules move from ground state to excited vibrational energy states • gives an infrared spectrum