EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
6th Edition
ISBN: 9781305687875
Author: Gilbert
Publisher: CENGAGE LEARNING - CONSIGNMENT
Question
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Chapter 8.2, Problem 7E

(a)

Interpretation Introduction

Interpretation:

The percent transmittance of a solution needs to be defined.

Concept Introduction :

The percentage of light that gets absorbed when it is passing through solution is termed as transmittance. This light which passes through gets detected by the instrument.

(b)

Interpretation Introduction

Interpretation:

The neat solution needs to be explained.

Concept Introduction :

A chemical reaction wherein there is no solvent present in the reaction is said to be neat reaction.

(c)

Interpretation Introduction

Interpretation:

The termhygroscopic needs to be explained.

Concept Introduction :

The phenomenon where the water molecules are attracted and held together via absorption or adsorption from its surrounding environment at room temperature is said to be hygroscopy.

(d)

Interpretation Introduction

Interpretation:

Thefixed thickness cell needs to be explained.

Concept Introduction :

There are specific methods for measurements for liquid samples of infra-red spectroscopy. For transmission methods, there are various types of cells used like liquid cell, fixed cell etc.

(e)

Interpretation Introduction

Interpretation:

Thefunctional group needs to be explained.

Concept Introduction :

There are specific substitutes or bonded molecules within the compound that is responsible for chemical reactions which are characteristic to it. These molecules or groups are called as functional groups.

(f)

Interpretation Introduction

Interpretation:

Thestretching vibrational mode needs to be explained.

Concept Introduction :

As per Heisenberg’s Uncertainty principle, all atoms in molecules are constantly in motion. The motion is commonly identified as translational, vibrational, and rotational.

(g)

Interpretation Introduction

Interpretation:

The bending vibrational mode needs to be explained.

Concept Introduction :

Heisenberg’s Uncertainty principle states that all atoms in molecules are constantly in motion. The motion of the atomsis commonly identified as translational, vibrational, and rotational.

(h)

Interpretation Introduction

Interpretation:

Thesuperimposibility (as applied in IR spectroscopy) needs to be explained.

Concept Introduction :

No two compounds can have the exact same IR spectrum. Also, IR spectrum is said to be the fingerprint of the compound. Most of the compounds have their unique fingerprints in the range of 1500cm-1.

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According to the Beer-Lambert Law, on which of the following does absorbance not depend?   A. Solution concentration.     B. Colour of the solution.   C. Extinction coefficient of the sample.   D. Distance that the light has travelled through the sample
a. Discuss about how molecular spectra differ from the atomic spectra and why. b. Discuss the effect of concentration on the absorption and fluorescence spectra as observed. c. Discuss the effect of excitation wavelength on the fluorescence spectra as observed. d. Discuss the shift of fluorescence spectrum comparing to the absorption spectrum.
9. Determine the transition which mainly occurred in IR analysis. A. Electronic transition only B. Rotational and vibrational transitions C. Rotational only D. Electron spinning only 10. The vibrational CO₂ is IR active when A. B. C. D. Asymmetric stretching Symmetric stretching Semi stretching None stretching
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