A chemical response is a process that always leads to the conversion of reactants into product or products. The substance or substances initially involved in a chemical reaction are called reactants. A type of a chemical response is often characterised by the type of chemical change, and it yields one or more products which are, generally, different from the reactants.

Generally speaking, chemical reactions encompass modifications that strictly contain the motion of electrons in the forming and breaking of chemical bonds. Chemical equations are often used to explain the chemical transformations of elementary particles that occur through the reaction.

Chemical adjustments are a result of chemical reactions. All chemical reactions involve a change in substances and a change in energy. However, neither matter nor energy is created or destroyed in a chemical reaction. There are such a lot of chemical reactions that it is helpful to classify them into different types together with the widely used terms for describing common reactions.

Mixture response or synthesis response: it is a reaction in which 2 or more chemical elements or compounds unite to form a more complicated product.

Instance: N2 + 3 H2 ' 2 NH3

Isomerisation response: is a response in which a chemical compound undergoes a structural rearrangement without any change in its net atomic composition.

Example: trans-2-butene and cis-2-butene are isomers.

Chemical decomposition reaction or evaluation: is a response in which a compound is decomposed into smaller compounds or components:

Example: 2 H2O ' 2 H2 + O2

Single displacement or substitution: this type of response is characterised by a component being displaced out of a compound by a more reactive element.

Example: 2 Na(s) + 2 HCl(aq) ' 2 NaCl(aq) + H2(g)

Metathesis or Double displacement reaction: represents a reaction in which two compounds exchange ions or bonds to form completely different compounds

Examples: NaCl(aq) + AgNO3(aq) ' NaNO3(aq) + AgCl(s)

Acid-base reactions: broadly these reactions are characterised as reactions between an acid and a base, can have completely different definitions relying on the acid-base concept employed. A few of the commonest are:

Arrhenius definition: Acids dissociate in water releasing H3O+ ions; bases dissociate in water releasing OH- ions.

Brønsted-Lowry definition: Acids are proton (H+) donors; bases are proton acceptors.

Lewis definition: Acids are electron-pair acceptors; bases are electron-pair donors.
Instance: HCl(aq) + NaOH(aq) ' NaCl(aq) + H2O(l)

Redox reactions: are reactions in which adjustments in oxidation numbers of atoms in concerned species occur. These reactions can often be interpreted as switch of electrons between different molecular sites or species.

Instance: 2 S2O32(aq) + I2(aq) ' S4O62(aq) + 2 I(aq)
In this case, I2 is reduced to I- and S2O32- (thiosulfate anion) is oxidized to S4O62-.

Combustion reaction: it is a kind of redox response in which any combustible substance combines with an oxidizing element, often oxygen, to generate heat and form oxidized products.

Instance: C3H8 + 5 O2 ' three CO2 + four H2O

Other types of chemical reactions include natural reactions which are present in natural chemistry.
Organic reactions compose a wide number of reactions involving compounds which have carbon as the main ingredient of their molecular structure. In opposition to inorganic reactions, natural chemistry reactions are categorized in large part by the types of the functional groups that exist within every compound. In this case the reactions are described by showing the mechanisms via which the adjustments take place.

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