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Chemical Sciences Physical chemistry Experiments

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Aim

Theory

Procedure

Pretest

Simulation

Posttest

References

Feedback

Instrumentation and Working Principles of Infra-Red (IR) Spectroscopy Using Salt Plates

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1.The O-H group in alcohol and carboxylic acids show at:

a: Alcohol at 3300cm^-1 and carboxylic acid at 3000cm^-1 Explanation

Explanation

b: At the same region around 3000cm^-1 Explanation

Explanation

c: Alcohol at 3000cm^-1 and carboxylic acid at 3300cm^-1 Explanation

Explanation

d: Cannot say Explanation

Explanation

2. What occurs when a molecule absorbs infrared radiation?

a: It warms up Explanation

Explanation

b: It spins faster Explanation

Explanation

c: It vibrates faster Explanation

Explanation

d: It emits light Explanation

Explanation

3. What determines the intensity of an IR peak absorption in an IR spectrum?

a: the change in polarizability during vibration Explanation

Explanation

b: the change in bond length during vibration Explanation

Explanation

c: the change in dipole moment during vibration Explanation

Explanation

d: the molecular weight of the bonding atoms Explanation

Explanation

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