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Natural rubber: Natural rubber is obtained by making small incisions on the bark of certain types of trees, like "Have a brasiliensis" and "Ganynle". White milky liquid substance (rubber latex) from the rubber tree by tapping is obtained. Latex is sieved to remove impurities then coagulated using coagulants like acetic acid or formic acid. Coagulated mass convert into coagulum. Coagulum is washed, dried and treated as follows:
1. Copper rubber: It is prepared by adding, little amount of sodium bisulphite, a retarder prevents, the discoloration and softening of rubber. Coagulum is allowed to drain for about two hours and after that it is passed through a creeping machine to form sheets of rubber of about 1 mm.
2. Smoked sheet: For preparing smoked sheets coagulation is carried out in long tanks. Sides of the tank have vertical grooves fitted with metal plates. First, dilute latex is added into the tanks and before that plates are removed. Coagulating agent, formic acid or acetic acid is then added and mixture is thoroughly stirred then plates are fitted and allowed to dry slabs are formed.
Draw a two-dimensional model of a closed-packed assembly of spheres. Change this model into a three-dimensional one. How many dissimilar possibilities are there of stacking a)
Antibiotics: A chemical substance generated by or derived from living cells that is able of inhibiting the life procedures or even destroying micro-organism is known as Antibio
What is the principle of EDTA titration method
a complete explnation about inductive effect with example
The freezing point of ethylene glycol is -3.2 degree-Celcius. How many grams of ethylene glycol is required in 150 L of water to achieve such temperature?
solution A is made by dissolving sodium acetate in methanol. so
has gold a chemical proporties show/
I have to write about the water treatment and the fda and epa and compare and contrast the rules and regulations for tap and bottled water and stuff. Can you help?
Which one of the following set of quantum numbers is not possible for 4p electron : (1) n=4, l=1, m=-1, s= +1/2 (2) n=4, l=1, m=0, s= +1/2 (3) n=
inductive effect of -OH and -CHO group
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