Question

What do you understand about the term chemical formula? give the example.

Answer 1

Explanation:

Chemical equations:

• are symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae.

Example:

$2{\mathrm{H}}_{2_{\left(\mathrm{g}\right)}}+{\mathrm{O}}_{2_{\left(\mathrm{g}\right)}}\to 2{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{aq}\right)}$

Representing the Direction of the Chemical Reaction

• The reactants and the products (for which the chemical formulae are written in chemical equations) can be separated by one of the following four symbols.
• In order to describe a net forward reaction, the symbol ‘→’ is used.
• In order to describe a state of chemical equilibrium, the symbol ‘⇌’ is used.
• To denote stoichiometric relationships, the ‘=’ symbol is used.
• In order to describe a reaction that occurs in both forward and backward directions, the symbol ‘⇄’ is used.

Representing the Physical States of the Reacting Entities

• The symbol (s) describes an entity in the solid-state
• The symbol (l) denotes the liquid state of an entity
• The symbol (g) implies that the entity is in the gaseous state.
• The (aq) symbol corresponding to an entity in a chemical equation denotes an aqueous solution of that entity.