Advertisements
Advertisements
प्रश्न
What is the significance of the formula of a substance ?
Advertisements
उत्तर
The significance of the chemical formula of any substance is as follows:
- A chemical formula of a substance (element or compound) represents its name.
- A chemical formula provides important information on the chemical makeup of any substance (element or compound). It names all the elements present in the molecule.
- A chemical formula also provides important information on the number of atoms of each constituent element of the molecule of the substance.
- A chemical formula represents one mole of molecules of the substance (element or compound), which is 6.022 × 1023 molecules of the substance.
- Since, a chemical formula represents one mole of molecules of a substance, it also represents the definite mass of that substance, which is expressed as gram molecular mass.
APPEARS IN
संबंधित प्रश्न
Write down the formulae of sodium oxide.
If the valency of carbon is 4 and that of sulphur is 2, work out the formula of the compound formed by the combination of carbon with sulphur. What is the name of this compound ?
An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X and Y ?
Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and
(ii) magnesium chloride ?
An element A forms an oxide A2O5.
What will be the formula of chloride of A ?
The formula of the nitride of a metal X is XN, state the formula of its hydroxide.
Write the formula of the following compound:
Sodium zincate
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Copper [I] sulphide
Play a game for writing formula.
Example 1: Make placards with symbols and valencies of the elements separately. Each student should hold two placards, one with the symbol in the right hand and the other with the valency in the left hand. Keeping the symbols in place, students should criss-cross their valencies to form the formula of a compound.
