1. If gas molecules in the earth\'s atmosphere have the ability to absorb IR rad

Question

1. If gas molecules in the earth's atmosphere have the ability to absorb IR radiation, these gases are known as are known as greenhouse gases. They absorb IR radiation to excite molecular vibrations, and then they re-emit IR radiation toward earth causing warming of the earth's surface. The more of these molecules that are present in the atmosphere, the greater the warming of the earth's surface. The following molecules are in the gas-phase at room temperature and can enter the earth's atmosphere. Which of these molecules are greenhouse gas molecules? CO2 NF3 CHF3 02 N2

Explanation / Answer

CO2, N2O, NF3 & CHF3 are greenhouse gas molecules. Essential condition for any molecule to function as green house molecule is the presence of polar covalent bond in the molecule. Therefore, O2 & N2 are not greenhouse gases.

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