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Softening water with chemicals
Try making suds with a half test tube of hard water and a few drops of soap solution. Next boil a same sample and again try to make suds by using the similar amount of soap solution.
Kwashiorkar: This disease was first recognised in 1935, in African children and it is named from two words of an African dialect, meaning first and second, i.e. sickness th
Air pollution by Particulates: Particulates constitute the third category of air pollutants. These are mostly fine carbon particles (less than 0.002 mm in diameter) formed b
Explain Cutabolic reactions Cutabolic reactions: The cycle provides a means for the degradation of two carbon acetyl residues which are derived from carbohydrates, fatty
Explain Organs of the Respiratory System The respiratory system consists of various organs. They form a clear pathway for the air to enter and leave the lungs. The body needs a
why the sun important for the water cycle
Method of science: We have seen above that science is an enaeavour to understand nature and to mould it to satisfy human needs. In earlier units we have seen that, in this pr
INTRODUCTION : In the first unit of this block you read about hazards due to electricity and gases in the science laboratories. 'The second unit deals with yet another type of com
What is tocopherols Vitamin E refers to a group of compounds known as which are the derivatives of a parent compound called as 'tocol'. Four tocopherols namely a, P,
Q.Name two biologically important compounds that contain both oxygen and nitrogen. Two biologically important compounds that contain both oxygen and nitrogen are: (i) Amino a
How is energy from food and energy from gasoline different?
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