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STRUCTURE OF WATERIt may interest you to know that water is a universal solvent and is a major constituent of all living organisms. Earth is the only planet where water exists in all its three phases. Availability and absence of water influence the distribution and abundance of plants, animals as well as human societies. The uniqueness of water is due to its structure and properties which are discussed in the following lines.
A water molecule (H2O) consists of two atoms of hydrogen and one oxygen. The hydrogen atoms share their electrons with the oxygen atom. The shared electrons become asymmetrically distributed. The negatively charged electrons are attracted more towards the oxygen nucleus which is more positively charged (8+) than a hydrogen nucleus (I+). Consequently, the hydrogen nuclei develop a smaH (delta) positive charge and the oxygen nucleus a small (delta) negative charge. Such a molecule is known as a polar molecule (Figure shown below). Remember that overall a water molecule is neutral since the number of electrons is equal to the number of protons.
Explain the Bunsen Burner? It is a type of gas burner that gives very hot flame by allowing air to enter at the base and mix with the gas. It is used - (a) For sterilizing i
Unsaturated fatty acids show different types of isomerisms. We have already learnt about the.concept of isomerism in the last unit. You would realize that fatty acids with s
Characteristics of River Systems The basic function of the rivers is to convey surplus rain water from land to sea. Annually the rivers carry fresh water, equivalent to 25 cm
explane the role of nitrogenase enzyme
The NYQUIST LIIMIT-It is a sampling phenomenon, which limits the maximum fiequemcy shift measurement to one half of the sampling frequency (PRF). By its nature, pulse wave
Diagram of Skeleton System of Rabbit
An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows
What is the swinging flashlight test used for It is done to check the relative afferent pupillary defect in an eye that is blind from optic nerve disease.
What is the life cycle of the schistosome? Male and female adult schistosomes live in blood vessels of the human intestines. The females release eggs that trespass the vessel w
Mechanical Prosthetic Valves : These patients should have lifelong anticoagulation. In the absence of anticoagulation systemic embolism and strokes have been reported to be 5-50
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