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प्रश्न
What is a chemical formula? What is the significance of a formula?give an example to illustrate?
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उत्तर
The chemical formula is used to describe the types of atoms and its number in an element or compound.
Significance- Chemical formula is very important when trying to find information about chemical compounds because they tell us about the elements present and the number of atoms in that compound.
Example - Salt - NaCl, ethanol C2H6O because the molecule of ethanol contains two Carbon, 6 Hydrogen and 1 Oxygen atom.
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संबंधित प्रश्न
State the chemical symbols for the following elements :
Sodium, Potassium, Iron, Copper, Mercury, Silver.
What is meant by a chemical formula ? Write the formulae of one element and one compound.
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its phosphate ?
Correct the following statement:
A molecular formula represents an element.
Correct the following statement:
Molecular formula of water is H2O2
Name the element in the compound and give the formula of the following compound:
Glauber’s salt
Write the formula of the following compound:
Potassium hydroxide
Write the formula of the following compound:
Sodium plumbite
Write the formula of the following compound:
Calcium sulphate
Write the formula of the following compound:
Magnesium nitrate
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Aluminium hydroxide
Write the formula of the following compound:
Lead [II] chloride
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
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
There is ______ oxygen atom is water molecule.
Derive the chemical formula for calcium chloride.
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.
