sat 2 physics

Astbury, by his X-ray diffraction studies, suggested three dimensional configuration for DNA molecule due to its high density. The purines and pyrimidines seemed to be flat rings arranged at right angles to the sugar-phosphate backbones and stacked one above another. The successive base pairs..

1. Phenols are colourless, crystalline solids or liquids. They become coloured due to slow oxidation with air. Phenol on oxidation by air forms a red coloured compound phenoquinone. (C 6 H 4 0 2 .2C 6 H 5 0H). 2. Phenols have characteristic odours and are s..

Diethyl ether is a colourless, pleasant odoured, highly volatile liquid. It boils at 307.5K. It is highly inflammable. The boiling point of C2H5 - O - C2H5 is much lower than that of alcohol containing the same number of carbon atoms, C4H9OH, as ether cannot associate its mole..

1. Science. Science means "to know". It is a systematic way of acquiring knowledge about the surroundings by careful observations and experimentations over a period of time. 2. Physics. Study of nature and natural phenomena, put in an organised way in various subtopics..

1) Among aliphatic amines, lower members are gases while higher members are liquids. Among aryl amines, the lower members are liquids while higher members are solids...

The equilibrium established between two physical forms of a chemical substance, is called physical equilibrium, viz. change of water into vapour at normal temperature in a closed vessel. Water and vapour are same as chemical substance but their physical for..

Equilibrium is also attained in physical processes such as vaporization and condensation. The conversion of a liquid into vapour is known as vaporization, while the opposite process, i.e., the conversion of a vapour into liquid is called condensation. The molecules of a liquid that..

1. Ethanol is a colourless liquid having pleasant smell. 2. Ethanol boils at 351 K. 3. It is miscible with water in all proportions. 4. It is nonconductor of electricity because it does not contain ions..

1. Ethanol is a colourless liquid having a pleasant smell. 2. Ethanol boils at 351 K. 3. It is miscible with water in all proportions. 4. It is a nonconductor of electricity because it does not contain ions. 5. It is neutral to litmus. ..

(i) It is a silvery white metal. (ii) It is a light ( specific gravity 2.2) but very strong metal, having high tensile strength. (iii) It is both malleable and ductile. (iv) It is a very good conductor of heat and electricity. (v) It can be highly polished to pr..