Q13 of 22 Page 17

Place a Pyrex& ass llama with its mouth-down in a sauce pan full of water, in such a way Out the stern tube of the funnel is above the water or pointing upward into the air. Rest the edge of the bottom portion of the funnel on a nail or on a coin so that water can get under it. Place the pan on a stove and heat it till it begins to boil. Where do the bubbles form first? Why'? Can you ex plain how a natural geyser works using this experience. (AS4)

We know the fact that the boiling point of water increases with increase in pressure. In this case, the bubbles start from the bottom of the sauce pan were we had put the nail or coin.

Similarly, in the geyser, boiling begins near the bottom and the bubbles that are raising above push the water out starting the process of eruption. This method could be treated as the laboratory demonstration of how a natural geyser functions.


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11

Equal amounts of water are kept in a cap and in a dish. Which will evaporate faster? Why? (AS3)

 12

Suggest an experiment to prove that the rate of evaporation of a liquid depends on its surface area and vapour already present in surrounding air. (AS3)

 14

Collect information about working of natural geyser and prepare a report. (AS4)

 15

Assume that heat is being supplied continuously to 2kg of ice at -5oC. You know that ice melts at 0oC and boils at 100oC Continue the heating till it starts boiling. Note the Immature every minute. Draw a graph between temperature and time using the values you get. What do you understand from the graph. Write the conclusion. (AS3)