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प्रश्न
The best evidence for the existence and movement of particles in liquids was provided by :
पर्याय
John Dalton
Ernest Rutherford
J.J. Thomson
Robert Brown
उत्तर
Robert Brown
APPEARS IN
संबंधित प्रश्न
Liquids have definite volume but do not have definite shape.
Differentiate between an atom and a molecule.
Give one difference between atoms and molecules.
Describe in your own words, what happens to the particles when salt dissolves in water.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
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.
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that metals are lustrous ?
Draw a flow-chart for the schematic representation of different types of matter.
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 ?
Name the different types of solutions. Give one example of each.
What is meant by the concentration of a solution ?
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Define the term matter.
Stars including Sun are covered in ______.
Liquids cannot be compressed and they have fixed volume.
Define the term matter.
