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प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
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उत्तर
this criteria is shown by atoms of any matter which may exist alone (like helium) or may not exist alone and exist in molecular form (like oxygen/o₂ )
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संबंधित प्रश्न
Liquids have definite shape and definite volume.
Define the following term of Matter .
Define the following term of Atom .
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What elements do the following compounds contain ?
Sugar, Common salt
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
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 ?
How will you test whether a given solution is a colloidal solution ?
Name the different types of solutions. Give one example of each.
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
Describe a method to separate a mixture of camphor and sand.
Matter is made up of ______.
What type of matter glass is?
Rusting of an article made up of iron is called
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Compressibility of solids: ______.
