What is a chemical equation?
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a chemical equation is representation of the chemical reaction in terms of the symbols of the respective elements taking place in that reaction
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A chemical equation is a symbolic writing that models the transformation of molecules and atoms during a chemical reaction. It can take several forms:
Reagents → products (irreversible chemical reaction, most common form in chemistry books); Transformation is possible only in one direction.
Reagents → products + energy (irreversible chemical reaction)
Reagents ⇌ products + energy (reversible reaction); The direct transformation is limited by the inverse, simultaneous transformation.For example, combustion of methane in dioxygen is described by:
CH4 + 2 O2 → CO2 + 2 H2O,
Whereas the reversible reaction of the Haber process is described by:
N2 + 3 H2 ⇌ 2 NH3 + 92.4 kJThe chemical equations are sometimes called reaction equations or equations-balance-sheets not to be confused with the reactions balances.
Example of reaction report: Methane + dioxygen → carbon dioxide + water
Reagents → products (irreversible chemical reaction, most common form in chemistry books); Transformation is possible only in one direction.
Reagents → products + energy (irreversible chemical reaction)
Reagents ⇌ products + energy (reversible reaction); The direct transformation is limited by the inverse, simultaneous transformation.For example, combustion of methane in dioxygen is described by:
CH4 + 2 O2 → CO2 + 2 H2O,
Whereas the reversible reaction of the Haber process is described by:
N2 + 3 H2 ⇌ 2 NH3 + 92.4 kJThe chemical equations are sometimes called reaction equations or equations-balance-sheets not to be confused with the reactions balances.
Example of reaction report: Methane + dioxygen → carbon dioxide + water
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