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Biochemistry
The term Biochemistry was first introduced by a German chemist Carl Neuberg in 1903.
It is the science concerned with the chemical nature and chemical behaviour of the living matter.

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Trichloromethane(chloroform)

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Trichloromethane  (chloroform)       CHCl3  Trichloromethane is a trichloro derivative of methane. It is commonly called as chloroform. Methods of preparation-  It is prepared by the chlorination of methane in the presence of sunlight.          Sunlight CH4 -------------------> CH3Cl + HCl             +Cl2              Sunlight CH3Cl ---------------> CH2Cl2+ HCl                +Cl2              Sunlight CH2Cl2 ---------------> CHCl3+ HCl                  +Cl2 Properties- (1) colourless heavy liquid (2) sweet taste  (3) it is oxidised in the sunlight and form a harmful gas carbonyl chloride which is commonly called as phosgene.                     Sunligh...
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Allotropes of carbon

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  Allotropes of carbon  The various physical forms in which an element can exist are called allotropes of the element. The carbon elements exists in three solid forms called allotropes. The three allotropes of the carbon are - (1) Diamond (2) Graphite (3) Buckminster fullerene               (1) Diamond Diamond is a colourless transparent substance having extraordinary shining. Diamond is quite heavy. Diamond is extremely hard. It is the hardest natural substance known. Diamond does not cunduct electricity. Diamond burns on strong heating to form carbon dioxide. If we burn diamond in Oxygen , then only CO2 gas is formed and nothing is left behind. This shows that diamond is made up of carbon only. Structure of Diamond -  A Diamond crystal is a very big molecule of carbon atoms. Each carbon atom in the diamond crystal is linked to four other carbon atoms by strong covalent bonds. The four surrounding carbon atoms ...
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Ohm's law

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                    Ohm's law  Ohm's law gives a relationship between current and potential difference. According to Ohm's law -      At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its end.         If I is the current flowing through a conductor and V is the potential difference ( or voltage) across its ends,then according to Ohm's law -              I ~ V   ( At constant temperature)       or,  V~ I       or,   V =  R  ×  I Where R is a constant called       " resistance'' of the conductor.  The SI unit of resistance is ohm. The value of this constant depends on the nature, length,are a of cross - section and temperature of the conductor.             ...
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