Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Which of the species listed below is not a green-house gas?

  1. (a) H2O
  2. (b) CH4
  3. (c) CO2
  4. (d) O2

Interpretation Introduction

Interpretation: The species which are not green-house gases has to be identified from the given list.

Concept introduction:

Greenhouse Effect: When the solar radiation reaches the earth’s atmosphere, some of the radiations gets reflected and some of the radiations are absorbed by earth’s surface. This energy is converted into heat and radiate back towards space. Some of these are trapped by green-house gases when going up to the atmosphere and this will heat up the earth’s atmosphere.

Greenhouse Gases:

  • CO2
  • CH4
  • N2O
  • H2O
  • HCl

The most important green-house gas is water vapor.

If the amount of green-house gases in the atmosphere become too high, then the temperature will increase and the planet become warmer.

Important reason for increasing green-house gases in the atmosphere: Burning of fossil fuels which increase the amount of CO2 in the atmosphere.


Reason for the correct answer:

Green-house effect is an important phenomenon to keep the earth warm. Earth’s surface absorbs energy from sun and release radiation like infrared. These radiations are absorbed by gases called as green-house gases and re-emit to the atmosphere. This will result in the heating of atmosphere.

Atoms which did not have chemical bonds cannot interact with infrared. Therefore single atom gases cannot act as green-house gases.

The diatomic molecules having bond between different atoms or those having three or more atoms also can act as green-house gases.

The molecules which did not absorb infrared include homo nuclear diatomic molecules. The gases like N2andO2 are present about 99.9% in the atmosphere and they cannot act as green-house gases.

O2 is a homo nuclear diatomic molecule and cannot absorbs infrared radiation

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