Tutor profile: Swarnika G.
Subject: Environmental Science
Fertilizers promote vegetative growth of plants and are hence used extensively in agricultural practices. The use of fertilizers is however not considered to be eco-friendly. Why?
During rains, the excess fertilizers from agricultural fields are mixed with the run-off and end up in water bodies. After reaching there, these chemicals promote excessive growth of algae leading to eutrophication which depletes the water of all the nutrients and oxygen, thus killing the marine life beneath. Besides this, fertilizers damage soil structure and does not promote the growth of friendly soil microorganisms.
Subject: Basic Chemistry
Both iron carbide and steel are made of iron and carbon. Then what's the difference between them?
Iron carbide is a compound formed when iron reacts chemically with carbon. Its constituents can only be separated by chemical methods, Whereas, steel is an alloy of iron and carbon, which is a mixture. Its constituents are not bonded chemically.
Acids are corrosive. But the hydrochloric acid in our stomach does not damage the inner walls of the stomach. Why?
Stomach lining is well protected by a thick layer of mucus which prevents the corrosive hydrochloric acid from damaging it.
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