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प्रश्न
What do you understand by chemical formula of a compound? What is its significance?
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उत्तर
- A chemical formula is a symbolic representation of one molecule of an element or a compound.
- It provides information about the elements present in the molecule and the number of atoms of each element. The chemical formula tells us the types of atoms and the number of each type of atom in one molecule of substance.
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संबंधित प्रश्न
What is meant by the term chemical formula?
The radius of an oxygen atom is 0.073 nm. What does the symbol ‘nm’ represent ?
(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its phosphate ?
Write the formula of the following compound:
Iron [II] sulphate
Write the formula of the following compound:
Diamine silver chloride
Write the molecular formulae for the following compounds
Aluminium (III) nitrate
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
- Ammonia
- Carbon monoxide
- (Hydrogen chloride
- Aluminium fluoride
- Magnesium sulphide
What is a chemical formula?
Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:
The formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be Na2SO4.
Do it yourself:
Now, write the formula of sodium phosphate.
