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प्रश्न
Define the following term of Atom .
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उत्तर
Atom — An atom is the smallest part of an element that takes place in a chemical reaction.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Define the term matter. What is it composed of?
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Name the property which allows metals to be hammered into thin sheets.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
“Is malleable and ductile” best describes :
Which of the following does not have a fixed melting point/boiling point ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Write a method to separate a mixture of sand and potash alum.
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?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
All the matter made of ______.
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Atoms or groups of atoms having a charge are called ______.
Solids possess very high kinetic energy.
Solid is an arrangement of particles ______.
Higher the temperature, the higher the kinetic energy of particles.
Define the term matter.
