laboratory experiments in plus two

Experiment 4 - In the laboratory, carbon dioxide is usually prepared by the action of dilute hydrochloric acid on marble chips. Marble chips are taken in a round-bottomed flask, as shown in figure 11...

In its simplest form, it consists of a cylindrical glass tube about 50 cms long, closed at both ends called the discharge tube (or Crookes tube). The tube is fitted with two metallic electrodes, which are connected to a source of high voltage. It is filled with gas and the discharge tube..

Take some crystals of iodine in an evaporating dish. Cover it with a glass funnel, as shown in figure 2.3. Close the tip of the tail of the funnel with some cotton. Heat the dish gently. The space inside the funnel gets filled with purple vapours of iodine. Stop the heating. The purple va..

In the laboratory, carbon dioxide is usually prepared by the action of dilute hydrochloric acid on marble chips. Marble chips are taken in a round-bottomed flask, as shown in figure 11.6. ..

Calcium carbonate is prepared in the laboratory by passing carbon dioxide gas into lime water. The resulting precipitate is filtered, washed and dried. The product obtained is known as precipitated chalk. Excess of carbon dioxide should be avoided since this leads to the formation of..

Experiment to Demonstrate Interference of Sound Waves - Interference of sound waves can be demonstrated using Quincke's tube. It consists of two U-tubes ABCDE and FGH, whose limbs can be inserted telescopically into each other. The tube ABCDE is provided with two side ..

The following experiment shows this property of adsorption (Fig.10.8). Place a jar of dry ammonia over mercury. Adjust the levels of mercury inside and outside the bell jar till they are equal. Carefully, push in a large piece of charcoal, preferably, activated charcoal. You will notice ..

Now, heat the water at 0 0 C further. Observe that the temperature of water rises till the water starts boiling. At sea level the water boils at 100 0 C. As soon as water starts boiling, its temperature remains constant, even if heating is continued. 'The temperature at which a liquid starts boilin..

Alkynes may be prepared by dehydrohalogenation (elimination) of dihaloalkanes preferably bromo derivatives. There are two methods of preparation for the two types of dihaloalkane..

In the laboratory, nitrogen is prepared by heating a mixture of ammonium chloride and sodium nitrite and a small quantity of water. If ammonium nitrite is heated by itself it decomposes to produce nitrogen gas. However, this reaction is very fast and may prove to be explosive. For safety,..