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Yogita Ingle 6 years, 7 months ago
Sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
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Yogita Ingle 6 years, 7 months ago
The growth of plants depends largely on the phenomenon of osmosis. Plants are composed of a large number of microscopic units called cells. . Cells contain a fluid called cell sap. and its wall is composed of a living cytoplasmic membrane which is semipermeable and is responsible for the phenomenon of osmosis in the plants.
Osmosis : The net spontaneous flow of the solvent molecules from the solvent to the solution or from a less concentrated solution to a more concentrated solution through a semipermeable membrane is called osmosis.
When the plant cell comes in contact with water or some dilute solution , the osmotic pressure of which is less than that of cell sap present in the plant cell, there will be a tendency of water to enter into the cell through the cell wall. This causes rupture of cell and this process is called Hemolysis.
In marshy lands the soil is highly wet and most of its minerals are washed away. Thus plants decay due to Hemolysis in marshy areas because of the contact of cells with soil water which is a low concentration solution since most of the minerals are already washed away. Thus plant cells rupture and hence plants decay.
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Yogita Ingle 6 years, 7 months ago
Dissociation simply means the splitting of ionic compounds into its constituents and so degree of dissociation is defined as the percentage of the solute matter dissociated in per mole of solution.
Simply, degree of dissociation = no.of moles of solute dissociated/ moles of solution
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Yogita Ingle 6 years, 7 months ago
Group reagents in qualitative analysis:
Qualitative analysis schemes are often based on selective precipitation of different cations. On careful selection of reagents and conditions of reactions, groups of ions can be separated on the basis of their reactivity and the solubility of their salts. As the cation gains its optimum concentration needed for precipitation it precipitates and hence allowing us to detect it. According to their properties, cations are usually classified into six groups. Each group has a common reagent which can be used to separate them from the solution. These reagents are called as group reagents.
For example: In 1st analytical group, there are cations which forms insoluble chlorides. As such, the group reagent to separate them is hydrochloric acid
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Yogita Ingle 6 years, 7 months ago
The Krafft temperature is defined as the minimum temperature at which ionic surfactants, form micells. It depends on the nature of hydrophobic groups and ionic composition of the detergent.
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