dry ice experiment

Take a germinating bean seed with the radicle about 2 cm in length. Dry the seedling with the help of filter paper and mark the root at 2 mm intervals from tip upwards with water proof ink. Place the seedling on moist filter paper in a petridish for 24 hours. Observe the ink mark..

We know that there is water vapour in air. In other words, air contains moisture and so it is wet. This quality of wetness is referred to as humidity. For our physical comfort, humidity should not be too high or too low. Usually when the atmospheric temperature is high, more evaporation of water ta..

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 ..

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. ..

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..

The experiment illustrated in figure shows the effect of pressure on the melting point of ice. A thin copper wire passes round a large block of ice and two weights are attached to the free ends of the wire. The pressure of the wire lowers the melting point of ice..

Presence of Water Vapour in Air - Ordinary air seems to be dry. It does not cause wetness on our body or clothes. However, you may have some idea about the huge quantity of rain, snow, dew, etc. that gets formed in a year throughout the world. All of it comes only from the air. Thus, the ..

When compressed to 70 atmospheres at room temperature, it liquefies to form liquid carbon dioxide. If this liquid carbon dioxide is allowed to vaporize, heat is drawn from the liquid itself, and as a result, further cooling occurs. The liquid carbon dioxide solidifies to form a snow like solid car..

Dry ice is used to create artificial clouds as special effects, for stage shows, films, discotheques etc. Dry ice is dropped into water; absorbing heat from the water, the solid carbon dioxide sublimes, carrying with it a lot of water vapor. These two togeth..

Water is the only substance that can exist simultaneously in all the three states of matter, i.e., solid, liquid and gaseous on this earth,. A simple experiment shows the existence of all these three states together. Take a glass half packed with ice cubes and cover it. Th..