SENIOR INTER IMPORTANT QUESTIONS (TM)


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2yr.chem,1yr.chem projects

Rate of Evaporation of Different Liquids  Objective of the Project This project is of the rate of evaporation of different liquid, in which we also discuss the factors which affect the rate of liquid.  Introduction When liquid is placed in an open vessel. It slowly escapes into gaseous phase ventually leaving the vessel empty. This phenomenon is known as vaporization or evaporation. Evaporation of liquids can be explained in the terms of kinetic molecular model although there are strong molecular attractive forces which hold molecules together. The molecules having sufficient kinetic energy can escape into gaseous phase. If such molecules happen to come near the surface in a sample of liquid all the molecules do not have same kinetic energy. There is a small fraction of molecules which have enough kinetic energy to overcome the attractive forces and escapes into gaseous phase. Evaporation causes cooling. This is due to the reason that the molecules wh...
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CHEMISTRY PROJECTS ON TENSILE STRENGTH OF FIBRES, AND QUANTITY OF CASEIN IN DIFFERNT SAMPLES OF MILK

Aim is To determine the quantity of Casein present in different samples of milk . Natural milk is an opaque white fluid Secreted by the mammary glands of Female mammal . The main constituents of natural milk are Protein, Carbohydrate, Mineral Vitamins, Fats and Water and is a complete balanced diet. Fresh milk is sweetish in taste. However , when it is kept for long time at a temperature of 5 degree it become sour because of bacteria present in air. These bacteria convert lactose of milk into lactic acid which is sour in taste. In acidic condition casein of milk starts separating out as a precipitate. When the acidity in milk is sufficient and temperature is around 36 degree, it forms semi-solid mass, called curd. Casein is present in milk as calcium caseinate in the form of micelles. These micelles have negative charge and on adding acid to milk, the negative charges are neutralized. Milk is a complete diet as it contains in its proteins, carbohydrates, fats, minerals, vitamin...
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