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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
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Define the term: Element
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Classify the following substances into elements and compounds
Mercury, sulphur, sugar, water, sand, gold, carbon, oxygen, alcohol, iron, marble, baking soda.
Define: Molecule
State the number of atoms of each element, present in \[\ce{HNO3}\].
Also name the compound.
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
Classify substances into pure and impure substances in the form of a chart or tabulation.
Select the correct answer from A, B, C, D & E for the statement given below :
A mixture consisting of elements & a compound.
Give a reason for the following statement :
Brass & bronze are examples of mixtures, while copper sulphate & lead nitrate are examples of compounds.
