Spirit kept open in a watch glass disappears after some time. Which among the following phenomena are responsible for this?

Which are the methods that can be used to separate the components of a mixture made of common salt, ammonium chloride and sand? Write the methods in the order in which they are applied.

Many minerals are present in ordinary water. Which is the method that can be used to remove the minerals and obtain pure water?

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?