Question

Q-1 When water containing washing powder is stirred vigorously, the foam separates out to float above the water surface. Why? Q-2 a) Who was Alessandro Volta ? a) Collect information on his remarkable contribution to science (8-10 lines) Q-3 Experiment based learning: Aim : Preparing a herbarium Process : i) Collect fallen leaves, flowers (5 each) from your surroundings. ii) Put the above between the newspaper sheets and place them below on the table. iii) Stack some heavy books on top for a week to press and dry out the leaves and flowers. iv) Once the process is done, remove the above and paste them in 5 white sheets and write the name of plant from which you have collected the above. v) Answer the following questions: a) What is herbarium? b) Why was drying in newspaper done? c) Which surface of leaf has more prominent veins? pls tell me the answer of 5 c part

Answer 1

because of centrifugation 1

Answer 2

When water containing a soap or any washing pawder is stirred vigorously ,it produces form that floats on water .

All less dense objects floats on water ,although form has almost the same density as water ,the difference comes in that form has filled air hence it is less dence than water

The air in it occupies a larger volume hence it floats ..form itself is a polystyrene