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Chemical Sciences Physical chemistry Experiments

Aim

Theory

Pretest

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Identification of Unknown Components Using Spectroscopic Techniques

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1. Which of the following statements regarding IR spectroscopy is correct?

a: IR radiation is higher in energy than UV radiation Explanation

Explanation

b: IR spectra records the scattering of the radiation Explanation

Explanation

c: IR spectra gives information about the ƛ_max of the molecule Explanation

Explanation

d: IR radiation is higher in wavelength than UV radiation Explanation

Explanation

2. What is the condition for a molecule to be Microwave active?

a: Change in dipole movement Explanation

Explanation

b: Change in polarisability Explanation

Explanation

c: Permanent dipole movement Explanation

Explanation

d: Isotopic labelling Explanation

Explanation

3. Identify the correct statement.

a: NMR signals towards the left of the spectrum correspond to low chemical shift values. Explanation

Explanation

b: NMR signals towards the right of the spectrum correspond to high chemical shift values Explanation

Explanation

c: Chemical shift values are larger when shielding effects are greater Explanation

Explanation

d: Chemical shift values are larger when deshielding effects are greater Explanation

Explanation

4. The absorption intensity on an absorption spectrum tells us:

a: energy associated with a particular excitation. Explanation

Explanation

b: the ease of transition. Explanation

Explanation

c: the concentration of the absorbing part of the molecule. Explanation

Explanation

d: both the ease of transition and the concentration of the absorbing part of the molecule. Explanation

Explanation

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