Question

What is chemical formula ?
How to write chemical formula ?

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Answer 1

Answer:

Answer :-

1. What is chemical formula ?

ans. The chemical formula of a substance is based on the composition of that substance. It indicates the type and number of atoms of each kind present in that substance.

The chemical formula of a substance is based on the composition of that substance. It indicates the type and number of atoms of each kind present in that substance. For example, the chemical formula of water is :-

$H_{2}O$

This means that a water molecule is formed by the combination of two atoms of hydrogen and one atom of oxygen.

This means that a water molecule is formed by the combination of two atoms of hydrogen and one atom of oxygen.Similarly, the formula of carbon dioxide is :-

$C O_{2}$

This means that a carbon dioxide molecule is formed by the combination of one atom of carbon and two atoms of oxygen.

2. How to write the Chemical Formula ?

ans. To write the chemical formula of a substance, the chemical symbols of all the elements are written and the number of atoms each elements is written as a subscript to the right side of its symbol. For example, nitric acid contains one atom of hydrogen, one atom of nitrogen and three atoms of oxygen. The chemical formula of nitric acid is, therefore, written as :-

$HNO_{3}$

(one is not written as a subscript). Similarly, glucose contains six atoms of carbon, twelve atoms of hydrogen and six atoms of oxygen. It's Chemical Formula is, therefore, written as :-

$C _{6}H_{12}O_{6}$

Many substances are made up of positively and negatively charged particles, called ions. Let us learn to write the chemical formula of such substances. For this, we need to know the symbols and charges of different ions present in a given substance.

Answer 2

Answer:

A chemical formula is a notation used by scientists to show the number and type of atoms present in a molecule, using the atomic symbols and numerical subscripts. In a chemical formula, the letters represent the atomic symbol of each atom.

    Steps to write chemical formula:

1. Write the symbol of the positive ion/radical to the left and the negative ion/radical to the right along with their valency number.
2. Interchange the valency number of the radicals and shift them to the lower side.
3. Example: Ammonium phosphate. NH₄⁺1 PO₄3⁻ (NH₄)₃PO₄

Explanation: