Question

How do chemical reactions be expressed in the chemical equation illustrate with example?

Answer 1

Answer:

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.[1] The coefficients next to the symbols and formulae of entities are the absolute values of the stoichiometric numbers. The first chemical equation was diagrammed by Jean Beguin in 1615.[2]

Formation of chemical reaction

A chemical equation consists of the chemical formulas of the reactants (the starting substances) and the chemical formula of the products (substances formed in the chemical reaction). The two are separated by an arrow symbol ( {\displaystyle \rightarrow } \rightarrow , usually read as "yields") and each individual substance's chemical formula is separated from others by a plus sign.

As an example, the equation for the reaction of hydrochloric acid with sodium can be denoted:

2 HCl + 2 Na → 2 NaCl + H

2

This equation would be read as "two HCl plus two Na yields two NaCl and H two." But, for equations involving complex chemicals, rather than reading the letter and its subscript, the chemical formulas are read using IUPAC nomenclature. Using IUPAC nomenclature, this equation would be read as "hydrochloric acid plus sodium yields sodium chloride and hydrogen gas."

This equation indicates that sodium and HCl react to form NaCl and H2. It also indicates that two sodium molecules are required for every two hydrochloric acid molecules and the reaction will form two sodium chloride molecules and one diatomic molecule of hydrogen gas molecule for every two hydrochloric acid and two sodium molecules that react. The stoichiometric coefficients (the numbers in front of the chemical formulas) result from the law of conservation of mass and the law of conservation of charge (see "Balancing Chemical Equation" section below for more information).

Common symbols

Symbols are used to differentiate between different types of reactions. To denote the type of reaction:[1]

" {\displaystyle =} =" symbol is used to denote a stoichiometric relation.

" {\displaystyle \rightarrow } \rightarrow " symbol is used to denote a net forward reaction.

" {\displaystyle \rightleftarrows } \rightleftarrows " symbol is used to denote a reaction in both directions.[3]

" {\displaystyle {\ce {<=>}}} {\displaystyle {\ce {<=>}}}" symbol is used to denote an equilibrium.[4].

The physical state of chemicals is also very commonly stated in parentheses after the chemical symbol, especially for ionic reactions. When stating physical state, (s) denotes a solid, (l) denotes a liquid, (g) denotes a gas and (aq) denotes an aqueous solution.

If the reaction requires energy, it is indicated above the arrow. A capital Greek letter delta ( {\displaystyle \Delta } \Delta ) is put on the reaction arrow to show that energy in the form of heat is added to the reaction. {\displaystyle h\nu } h\nu is used if the energy is added in the form of light. Other symbols are used for other specific types of energy or radiation

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Answer 2

Explanation:

chemical equation is nothing but an word equation which contains all the nessecary information required to perform the reaction...such as

1. no.of moles
2. state of elements, compounds & ions...taking part in the reaction
3. change in colour
4. temperature factors
5. exo or endo reaction