Daily Life Chemistry

By Hassaan Qazi FA05-BF-0006

AGENDA Evaporation process Acid rains Ozone layer Conclusion

EVAPORATION Evaporation is the process by which

molecules in a liquid state (e.g. water) spontaneously become gaseous (e.g. water vapor) without being heated to boiling point. It is the opposite of condensation Generally, evaporation can be seen by the gradual disappearance of a liquid, when exposed to sunlight.

WATER CYCLE

ACIDS RAINS The term acid rain or more accurately acid

precipitation is commonly used to mean the deposition of acidic components in 1.Rain 2.Snow 3.Dew 4.Dry particles

CAUSES OF ACID RAINS Acid rain occurs when

sulfur dioxide and nitrogen oxides are emitted into the atmosphere. Undergo chemical transformations, and are absorbed by water droplets in clouds. The droplets then fall to earth as rain, snow, mist, fog etc.

OZONE LAYER

Ozone (O3) is a tri-atomic

molecule consisting of three oxygen atoms. Its Systematic name Trioxygen. It’s a bluish colored gas. Situated about 15 to 30 km away from the earth.

OZONE LAYER Protects living beings by

absorbing harmful ultraviolet radiation (UVB) from the sun.

DESTRUCTION OF LAYER CFCs are responsible for

the destruction of the ozone layer. If the ozone layer is completely destroyed then harmful UV radiation.

CONCLUSION Firstly we must try to reduce the emission of

sulfur dioxide and nitrogen oxides to prevent acid rains. Secondly to reduce the use of CFCs related products in order to save the depletion of ozone layer.