From the given modes of vibrations of water molecule, the vibration mode which contributes to the green house effect has to be identified. Concept introduction: • Greenhouse gases are one type of gas which traps the heat within the system and thus it increases the overall temperature of the earth resulting global warming . Examples: C O 2 , C H 4 .. • Greenhouse effect: The heat near the earth surface gets trapped by the gases present in the earth atmosphere. The carbon dioxide is the primary gas that traps more heat. • Trapping of IR radiation constitutes the greenhouse effect. • IR Spectroscopy: The bonds between atoms in the molecule stretch and bend, absorbing IR energy and creating the IR spectrum. • Asymmetrical stretching or bending and internal rotations changes the dipole moment of a molecule. Asymmetrical stretching and bending is IR active. Symmetrical stretching and bending does not change the dipole moment of a molecule and so it is not IR active. Vibrations in a Non-linear triatomic ( H 2 O ) molecule is shown below,

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Chapter 4, Problem 15Q

Interpretation Introduction

Interpretation:

From the given modes of vibrations of water molecule, the vibration mode which contributes to the green house effect has to be identified.

Concept introduction:

• Greenhouse gases are one type of gas which traps the heat within the system and thus it increases the overall temperature of the earth resulting global warming.

Examples: CO2,CH4..

• Greenhouse effect: The heat near the earth surface gets trapped by the gases present in the earth atmosphere. The carbon dioxide is the primary gas that traps more heat.

• Trapping of IR radiation constitutes the greenhouse effect.

• IR Spectroscopy: The bonds between atoms in the molecule stretch and bend, absorbing IR energy and creating the IR spectrum.

• Asymmetrical stretching or bending and internal rotations changes the dipole moment of a molecule. Asymmetrical stretching and bending is IR active. Symmetrical stretching and bending does not change the dipole moment of a molecule and so it is not IR active.
Vibrations in a Non-linear triatomic (H2O) molecule is shown below,

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