action of heat and sulphur calcium

Action of Heat on Sulphur - When heated, sulphur undergoes a series of characteristic changes. Sulphur can melt at two different temperatures. a) If heated rapidly, it melts at 112.8 o C. b) But if heated slowly it will..

Sulphur can melt at two different temperatures. a) If heated rapidly, it melts at 112.8 o C. b) But if heated slowly it will melt only at 118.6 o ..

When heated to about 500 o C, sulphur trioxide decomposes to give sulphur dioxide and oxygen...

During initial heating of calcium sulphate dihydrate, the crystal structure changes. On further heating at 390 K, it loses water and forms CaSO 4 .5H 2 O or (CaSO 4 ) 2 .H 2 O. This is known at Plaster of Paris. On heating above 437 K, it becomes anhydrous C..

Apparatus required: Water, 50% sulphuric acid, glass slides, cover slips, microscope, sections of chlorophyll-free leaf, blotting paper and droppe..

When heated to 150C, magnesium sulphate heptahydrate changes to monohydrate, MgSO 4 .H 2 O, which at 200C gives anhydrous magnesium sulphate. On further heating, it is decomposed forming the oxide...

When nitric acid or nitrates of metals other than sodium and potassium are heated, reddish brown fumes of nitrogen dioxide are produce..

Racemisation can be brought about by increasing the temperature. For e.g., lactic acid and amyl alcohol can give racemic mixtur..

It is interesting to note that when metallic nitrates and chlorides are heated with concentrated sulphuric acid, respective acids are formed i.e. nitric acid and hydrochloric acid. This shows less volatile nature of sulphuric aci..

Dry sulphur dioxide does not have any bleaching action. However, if the gas is moist, or if the object to be bleached is moist, then bleaching takes place. Usually only delicate articles such as coloured flowers, silk, wool etc., are bleached by sulphur dioxide. The bl..