chemistry experiment

Air free from dust, moisture and carbon dioxide is bubbled through heated mercury. The oxygen of the air combines with the heated mercury to form mercuric oxide, a red coloured solid. The uncombined part of air is nitrogen, which is collected by the downward displacement of water (Fig.12.2). ..

The positively charged particles were discovered by E.Goldstien. He modified the discharge tube experiments by using a perforated cathode and after evacuating the tube he applied high voltage across the electrodes. Apart from the usual cathode rays emerging from the perforations, he foun..

Fill a clean dry round-bottomed flask with dry ammonia, close it by a one holed stopper, through which a long jet tube is introduced. The free end of the tube is dipped into a trough of water as shown in figure 6.5. Add two or three drops of an acid and a small quantity of phenolphthalein to t..

Carbon monoxide is prepared with the help of oxalic acid and concentrated sulphuric acid as shown in figure 11.2...

Take a large block of charcoal. Make a cavity with a pointed knife, and place lead monoxide powder in the cavity. With the help of a blowpipe, blow a bunsen flame into the cavity. Charcoal reduces lead monoxide to a molten bead of lead. By plunging the charcoal block carefully in cold water, the m..

Take about 2 - 4 g of cane sugar, and add about 5 ml of concentrated sulphuric acid. You will notice that the white crystals of sugar gradually change to yellowish brown and then to brown, and finally to black color. Add some water to wash out the unused sugar or excess of sulphuric acid. Then fil..