Kerala Board Solutions for Chapter: Properties of Matter, Exercise 14: Extended activities

For which type of mixture distillation method employed?

Water purified by distillation method is distilled water. Write two instances of its use.

In the following statements, which apply to solid substance only?

Take a small wooden rectangular block and find its volume. Take a big measuring jar and fill three-fourth of it with water and mark the water level. Then dip the block in water in the jar. (To prevent floating, nails can be inserted in the block). Mark the difference in the water level. Is there any relation between the difference in the water level and the volume of the block?

Take a big measuring jar and fill three-fourth of it with water and mark the water level. Then dip the small wooden block in water in the jar. (To prevent floating, nails can be inserted in the block). Mark the difference in the water level. Which property of matter is revealed by this experiment?

Electronic balances are very popular now. On an electronic balance, find the weight of an empty balloon. Again, find its weight after filling the air. Now, can you find the weight of the air in the balloon?

Take water mixed with chalk powder in a bottle. Tie a string to a bottle and swirl it at high speed along a circular path. Observe after sometime.

Repeat the activity using other mixtures which are suspensions. To which method of separation of components of a mixture can this be connected? Are there instances where this principle is made use of. Prepare a note.

Take a long white chalk piece and put a mark with black ink slightly above the bottom. Keep the chalk piece dipped perpendicularly in water in a watch glass. After sometime observe the changes. Repeat the experiment using different chalk pieces marked with sketch pens of different colours.To which of the methods of separation you have studied is this related?