Advertisements
Advertisements
Question
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
Advertisements
Solution
The fast moving molecules of air trapped in the inflated balloon exert continuous pressure on the thin, stretched rubber sheet of balloon and keep on diffusing out through it gradually. Therefore, the air escapes out of the balloon after some time.
APPEARS IN
RELATED QUESTIONS
Define matter. Give four examples of matter.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
What is meant by saying that metals are lustrous ?
What are the two types of pure substances? Give one example of each type.
What is the other name for impure substances ? Give two examples of impure substances.
Name a metal which can be easily cut with a knife.
Name a metal which has a low melting point.
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Define solvent.
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process which is used in milk dairies to separate cream from milk.
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Which of the following mixture cannot be separated by using water as the solvent ?
Explain the meaning of the term ‘matter’.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Define the term matter.
Define the term matter.
