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प्रश्न
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
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उत्तर
Objects are made from substances. Objects have definite shape and size.
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संबंधित प्रश्न
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
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 ?
State whether colloidal solutions are homogeneous or heterogeneous.
What will happen if a saturated solution is :
- heated
- cooled
What is meant by a solution?
One of the following does not show Tyndall effect. This one is :
How is scrap iron separated from a heap of waste materials in factories?
How will you separate a mixture of iron filings, chalk powder and common salt ?
Evaporation is always accompanied by ______ in temperature.
