EVERYDAY SCIENCE

Detailed explanation-1: -Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100, 000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.

Detailed explanation-2: -Chlorofluorocarbons. Chlorofluorocarbons (CFCs) were widely used as refrigerants until the 1980s when it was confirmed that they were the main source of harm to the ozone layer. They are also considered greenhouse gases that cause climate change.

Detailed explanation-3: -Chlorofluorocarbons (CFCs) and other halogenated ozone-depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).

Detailed explanation-4: -Ozone destruction Cycle 1 is illustrated in Figure Q9-1. The cycle is made up of two basic reactions: Cl + O3 and ClO + O. The net result of Cycle 1 is to convert one ozone molecule and one oxygen atom into two oxygen molecules. In each cycle, chlorine acts as a catalyst because ClO and Cl react and are re-formed.

Detailed explanation-5: -chlorofluorocarbons (CFCs) halon. carbon tetrachloride (CCl4) methyl chloroform (CH3CCl3) hydrobromofluorocarbons (HBFCs) hydrochlorofluorocarbons (HCFCs) methyl bromide (CH3Br) bromochloromethane (CH2BrCl) 03-Oct-2021