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प्रश्न
Explain the difference between Atoms and molecules.
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उत्तर
| Atoms | Molecules | |
| 1 | Atoms are the smallest particles of an element that can participate in a chemical reaction. | Molecules are the smallest parts of an element or compound, which exist independently. |
| 2 | They do not break up during chemical reactions. | They break up during chemical reactions. |
| 3 | They may or may not exist in a free state. | They exist in free forms. |
संबंधित प्रश्न
What is the difference between a pure substance and a mixture ?
Name: a Metal Which is a Poor Conductor of Electricity.
Define: Molecule
Indicate whether the following statement is true or false:
Elements are made up of compounds
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
Write the names of elements from the following symbol:
Ti
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
