Question

Types of chemical reactions in wikipedia

Answer 1

All chemical reactions can be placed into one of six categories. Here they are, in no particular order:

1)Combustion: A combustion reaction is when oxygen combines with another compound to form water and carbon dioxide. These reactions are exothermic, meaning they produce heat. An example of this kind of reaction is the burning of napthalene:

C10H8+ 12 O2--- 10 CO2+ 4 H2O

2)Synthesis: A synthesis reaction is when two or more simple compounds combine to form a more complicated one. These reactions come in the general form of:

A + B --- AB

One example of a synthesis reaction is the combination of iron and sulfur to form iron (II) sulfide:

8 Fe + S8--- 8FeS

3)Decomposition: A decomposition reaction is the opposite of a synthesis reaction - a complex molecule breaks down to make simpler ones. These reactions come in the general form:

AB --- A + B

One example of a decomposition reaction is the electrolysis of water to make oxygen and hydrogen gas:

2 H2O --- 2 H2+ O2

4)Single displacement: This is when one element trades places with another element in a compound. These reactions come in the general form of:

A + BC --- AC + B

One example of a single displacement reaction is when magnesium replaces hydrogen in water to make magnesium hydroxide and hydrogen gas:

Mg + 2 H2O --- Mg(OH)2+ H2

5)Double displacement: This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form:

AB + CD --- AD + CB

One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:

Pb(NO3)2+ 2 KI --- PbI2+ 2 KNO3

6)Acid-base: This is a special kind of double displacement reaction that takes place when an acid and base react with each other. The H+ion in the acid reacts with theOH-ion in the base, causing the formation of water. Generally, the product of this reaction is some ionic salt and water:

HA + BOH --- H2O + BA

One example of an acid-base reaction is the reaction of hydrobromic acid (HBr) with sodium hydroxide:

HBr + NaOH --- NaBr + H2O


hope it will help u

Answer 2

There are total 9 types of the chemical reactions.
They are named as follows :-

1. Combination reaction

When 2 or more reactants combine in a reaction to form a single product, it is called as Combination reaction.

Example
2Mg + O2 ==> 2MgO

2. Decomposition reaction

The chemical reactions in which two or more products are formed from a single reactant is called a decomposition reaction.

Example
CaCO3 ==> CaO + CO2

3. Displacement reaction

The reaction in which the place of ion of a less reactive element in a compound is taken by another more reactive element by formation of its own Ion is called a displacement reaction.

Example
CuSO4 + Zn ==> ZnSO4 + Cu

4. Double Displacement reaction

The reactions in which the ion in the reactants are exchanged to form a precipitate are called double displacement reactions .

Example
AgNO3 + NaCl ==> AgCl + NaNO3

5. Endothermic Reaction

The chemical reactions which are accompanied by absorption of heat are called endothermic reactions.

Example
CaCO3 + Heat ==> CaO + CO2

6. Exothermic reaction

The chemical reactions which are accompanied by evolution of heat are called Exothermic reaction.

Example
CaO + H2O ==> Ca(OH)2 + Heat

7. Reduction Reaction

The chemical reaction in which hydrogen is gained and oxygen is losed is called as Reduction Reaction.

Example
C + 2H2 ==> CH4

8. Oxidation Reaction

The chemical reaction in which a reactant combines with oxygen or loses hydrogen is called as Oxidation Reaction.

Example
MgH2 ==> Mg + H2

9. Redox Reaction

The chemical reaction in which both reduction and oxidation reaction takes place simultaneously is called Redox Reaction.

Example
CuO + H2 ==> Cu + H2O

These are the types of reaction.

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