8 Groups upto Calcium (Atomic Number -20)
Representative Periodic Table for 8 Groups upto Calcium (Atomic Number -20) - Representative elements are those elements whose inner shells are complete and whose outer shell (valency shell) has 1 to 7 electrons. They are also called normal elemen..
In biochemical systems
pH plays a very significant role in biochemical reactions. For example, the blood in our bodies is buffered at a pH value of 7.36-7.42 due to bicarbonate - carbonic acid buffer. A mere change of 0.2 pH units can cause death. Certain enzymes get activated only at certain definite pH value..
Solution:
1 mole of N 2 = 1 GMM 1 mole of N 2 = 2 x 14g = 28g 1 mole = 28 g ? = 7 g 7g of nitrogen is equal to 0.25 mol..
1 mole of N 2 = 1 GMM 1 mole of N 2 = 2 x 14g = 28g 1 mole = 28 g ? = 7 g 7g of nitrogen is equal to 0.25 mol..Colloids
A colloid is a solution in which the particle size ranges between 10 - 7 and 10 - 5 cm. For example, milk, blood, honey, smoke, ink, gum, starch solution et..
Liquefaction
When cooled under pressure ammonia condenses to a colorless liquid, which boils at -33.4 o C. When further cooled, it freezes to a white crystalline snow-like solid, which melts at -77.7 o ..
When K » 1
When the value of K is very high such as, 10 7 -10 1 5 or more, the reaction proceeds to almost completion. In such reactions almost the whole of the reacting substance gets converted into product..
From tincal
It is obtained from tincal by extracting it with water, concentrating the solution and leaving it for crystallization, when crystals of borax, Na 2 B 4 O 7 .10H 2 O separate ou..
Significance of Kc
It tells us about the extent to which the reaction has been completed. K c for Zn-Cu cell at 298K is 2 x 10 7 which shows that the reaction has nearly gone to completio..
Superconductivity
When the electrical resistance of materials becomes almost zero, the material becomes superconductor. The temperature at which the material shows superconductivity is called transition temperature. Example: YBa 2 Cu 3 O 7 at 90..
Superconductivity
Superconductivity - When the electrical resistance of materials becomes almost zero, the material becomes superconductor. The temperature at which the material shows superconductivity is called transition temperature. Example: YBa 2 Cu 3 O 7 at 90..
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