high school physics

Acetaldehyde is a colourless pungent odoured substance with boiling point 294K. It is miscible with water, ethanol and ether in all proportions. Acetone is a colourless highly inflammable liquid with pleasant odour. It boils at 329K. It is miscible with water, ethanol and ether in al..

1. Physical state: Dimethyl ether and ethyl methyl ether are gases at room temperatures. Other lower members are colourless liquids, which are highly volatile. 2. Boiling points: Ethers have much lower boiling points compared to isomeric alcohols as they are not assoc..

(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 poli..

. Exceptions Hydrogen and helium have in their outermost shells 1 and 2 electrons respectively, but they are nonmetals. In these cases, the outermost shell is the first and only shell (K shell). 2. Electropositive character Metals have high electropositivity, i.e., the metal atoms have a ..

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 ..

; exhaustion; nervous breakdown; high fever. 10. FAT-SOLUBLE VITAMINS Vit. A (Retinol) Synthesized in cells of liver and intestinal muc ous membrane from car- carotenoid pigments; found in milk, butter, kidneys, egg yolk, liver, fish oil, etc. Essential for synthesis of visual pigments; g..

Arenediazonium salts are generally colourless crystalline solids. They are highly soluble in water and are stable at cold temperatures but react with water when warmed. They decompose easily in the dry state and many of them especially nitrites are dangerously explosive in the dry state..

Pure liquid water is colourless, transparent, tasteless, odourless and very diffusible due to small size of its molecules. It, however, gives a bluish tinge in thick layers. It freezes at 0 C and boils at 100 C. Its"maximum density is 1.00 at 4 C. Its pH is 7.00 (neutral). It is a poor condu..

1. Nature : It is a greyish black opaque substance, soft and slippery to touch, and has a metallic lustre. It leaves a black mark when drawn across a paper. 2. Specific gravity is 2.3, making it lighter than diamond. 3. Conductivity : Good conductor of heat and electricity. 4. Melting Po..

1. Nature : Diamond is the purest form of carbon and the hardest known substance. It is transparent, lustrous and may be coloured due to the presence of impurities. For example, black diamonds, called carbonado, contain traces of graphite. The abrasive nature or hardness of diamond is due to its..