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प्रश्न
Differentiate between the following:
Atoms and molecules
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उत्तर
Atoms :
1. it is the smallest part of an element.
2. It does not have an independent existence
Molecules :
1. It is the smallest part of a compound.
2. It has an independent existence.
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संबंधित प्रश्न
Define: Gas.
Name the terms for the process due to which a solid directly changes into its vapours.
Write whether the following statement are true or false.
There is no difference between evaporation and boiling.
Give two examples for the following :
Substances that are rigid and not compressible.
Define matter.
Define Molecule.
Give reason :
When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass does not rise.
Match the column.
| Column A | Column B |
| 1. iron and gold | a. molecules are very far apart |
| 2. melting | b. pure substance |
| 3. intermolecular space | c. non-metals |
| 4. compound | d. the space between the molecules |
| 5. gases | e. changes from solid to liquid |
| f. metals |
In one sample of brass, the following ingredients were found: copper (70%) and zinc (30%). Identify the solvent, solute and solution from these.
State the correct term from A, B, C, D, E or F in List II which represents the – change of state of matter or its relevant property from List I
| List I | List II |
| 1. Solid 'X' to a liquid 'Y' | A: Liquefaction |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Solidification |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting Point |
| F: Boiling point |
