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प्रश्न
Give one difference between atoms and molecules.
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उत्तर
Atoms may or may not have independent existance. Molecules have independent existance.
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संबंधित प्रश्न
Liquids have definite shape and definite volume.
Name the terms for the change of vapour into a liquid.
Define the following term of Matter .
All kinds of matter
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
What are the two types of pure substances? Give one example of each type.
Which of the following are compounds ?
- CO
- No
- NO
- Co
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In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
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When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
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A standard sheet of paper is about ______ of atoms thick
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Define the term matter.
Define the term matter.
