Benzoic acid

Published November 11, 2017

Benzoic acid

A chemist, using the fact that benzoic acid has the ability to sublimate, can at any time of the year arrange a "winter garden" on the laboratory table. To do this, under a glass cap on a plywood board, fix the branches of coniferous plants and put a cup in which there is benzoic acid in the hole made in the middle of it. When the calyx is heated from below by the flame of the alcohol lamp, it sublimes...

Slaking of lime

Published November 11, 2017

Slaking of lime

Calcium oxide CaO is called quicklime. Because of its interaction with water, the so-called slaked lime is obtained, and the process itself is slaking of lime. To demonstrate the extinction of lime, pour a slurry of 25 g of calcium oxide on the asterite plate. From above, we make a hole in the test tube and pour water into it...

How can I freeze water?

Published November 11, 2017

How can I freeze water?

How can I freeze water? Freeze water in the following way. We will weigh 520 g of snow and measure the beaker with 130-140 ml of concentrated sulfuric acid. We mix them in a beaker, then place in a glass with a mixture of a test...

How does carbon dioxide tread on the steps?

Published November 11, 2017

How does carbon dioxide tread on the steps?

How does carbon dioxide step through the steps? Interesting experience can be demonstrated in chemistry lessons. In a large can of 3-4 liters we put a ladder of tin. For each step of the stairs we put a small candle stump. We light all the candles. The tube, lowered to the bottom of the can, is let in from Kipp's apparatus...

Red solution

Published November 11, 2017

Red solution

An interesting red solution from the blue powder can be obtained as follows. Take the powder from the cup, demonstrate its blue color and fill it in a dry glass. Then pour half a glass of water, stir the powder with a glass rod and get a red solution. To make a blue powder, fry in a cup of crimson crystals of chloride...

Fountain on the table

Published November 11, 2017

Fountain on the table

An interesting fountain on the table can be demonstrated to friends. To do this, fill the flask with a capacity of 0,5 liters with a meter glass tube, which is inserted into a leaky plug (to prevent rupture of the bulb to pieces) and lowered almost to the bottom, we pour 300 ml of water and gently throw in a piece of dry ice the size of a pea (no more!). In water, it turns into a gaseous state and presses on the water in the flask...

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