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प्रश्न
What are molecules ?
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उत्तर
Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.
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संबंधित प्रश्न
Define matter.
Name the terms for the change of a solid into liquid.
A kind of matter which can sublime is
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
How would you confirm that a colourless liquid given to your is pure water ?
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Which of the two will scatter light : soap solution or sugar solution ? Why ?
State whether the following statement is true or false :
Bread is an example of solid foam.
Explain what happens when a beam of light is passed through a colloidal solution.
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
What is the general name of the process by which tea-leaves are separated from prepared tea ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Explain how, nitrogen , oxygen and argon gases are separated from air.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
______ is not made of matter.
Solids do not flow.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Define the term matter.
