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प्रश्न
Why are the symbols and formulae of substances important?
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उत्तर
Importance of symbols and Formulae:
Symbols and formulae of substance gives a lot of information like.
1. Types of elements present in the compound. E.g. (H20 is made of two elements hydrogen and oxygen).
2. Number of each kind of atoms in one molecule. E.g. (water has 2 atoms of hydrogen combined with 1 atom of oxygen.)
3. Mass of one molecule of the compound. E.g. [H2O has mass (1 × 2) + 16 = 18 g].
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
KNO3
Give the name of the element present in the following compound:
Quick lime
Give the name of the element present in the following compound:
Potassium sulphate
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
State the term.
The number of atoms present in a molecule of an element _________
Define: Mass number :
Define: Atomic weight :
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
What is the difference between the molecule of an element and the molecule of a compound ? Give one
example of each.
Give one example of a triatomic molecule
Give one example of a polyatomic molecule.
State the atomicity of the following:
Oxygen
Which of the following is a short and scientific way of representing one molecule of an element or compound?
Classify the following molecules as the molecules of element or compound
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| 2. |  |
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| 4. |  |
Define: Atomicity.
Give any two examples for heterodiatomic molecules.
