Tag: water: a precious resource

Henry Cavendish showed that water is made up of hydrogen and oxygen.

The number of molecules of water is 5. The formula is $CuSO _4. 5H _2O$.

The colour of hydrated copper sulphate is blue.

Anhydrous cobalt(II) chloride is blue. When it reacts with water, it forms the hexahydrate complex CoCl2.6H2O, which is pink.

The colour of anhydrous copper sulphate is white.

Approximately 97 percent of Earth's water is saline, found in the oceans. Among the options provided, 93.7 percent is the closest accepted value in many textbooks.

H2S is a reducing agent and H2SO4 is an oxidizing agent. The reaction typically produces sulfur (S), sulfur dioxide (SO2), and water (H2O). H2O2 is not a product of this reaction.

The earth appears blue from outer space because 70% of the earth's surface contains water, i.e., water bodies like oceans, seas, rivers, lakes, etc.

The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules is called surface tension. while washing clothes, detergents reduce the surface tension of the water molecule which causes the formation of foam and cleaning of clothes. 

Hard water contains chlorides, carbonates and bicarbonates of sodium and magnesium ions which combine with soap micelles and do not give lather with soap.