CHEMICAL REACTION ( WHAT IS CHEMICAL REACTION? )

 

CHEMICAL REACTION

 ( WHAT IS CHEMICAL REACTION? )

CHEMICAL REACTION DEFINITION AND EXAMPLE

 Chemical reaction is a process which take place between one or more than one substance and create a different substance. Or one or more than one substance reacts together and create a new substance. This type of the process is called chemical reaction.

For example: if we burn a magnesium ribbon in present of oxygen (magnesium ribbon must be cleaned) after that magnesium ribbon burn with dazzling white flam change into white powder.

2Mg + O₂                      2MgO

    In this reaction, magnesium and oxygen are reactants which are react together and create a product named magnesium oxide. In chemical reaction neither a substance created nor destroy. It means the mass of reactants and mass of products are equal.

Jean beguin was the Frist man who represented chemical reaction through chemical equation in 1615.

Now the question is why we need to balance the chemical equations. The answer of this question is given below:

  Law of conservation of mass is the reason of balancing a chemical equation which told us “mass can neither be created nor destroyed in a chemical reaction.” So, we balance a chemical equation. We can balance a chemical reaction through hit and trial rule. That is why we balance the chemical equation. Now let’s talk about type of chemical reaction.

TYPES OF CHEMICAL REACTION WITH EXAMPLE

1. COMBINATION REACTION

   Combination reaction is a chemical reaction which take place between two or more than two substances and create only one substance.

For example: if we react between sodium and chlorine the it will create a unique substance which named sodium chloride or salt. We can write a chemical equation.

   A solution of slaked lime is produced by combination reaction and it is use for white washing on the wall. Calcium hydroxide reacts solely with carbon a create a thin layer on the wall. The thin layer of the Calcium hydroxide is calcium carbonate.

Na + Cl₂                                          NaCl

We should balance the chemical equation. Now let’s balance the chemical equation.

2Na + Cl₂                                        2NaCl

2.DECOMPOSITION REACTION

   In this reaction, reactant break down into mini substances by heat, electricity, and light. It means this chemical reaction is divided into three part.

(a)    Thermal decomposition: When a substance is decomposed by heat then it is called thermal decomposition. For example: when calcium carbonate is heated then it is divided into two-part calcium oxide and carbon di oxide.

     CaCO₃                        CaO + CO₂

(b)    Electrolysis or electrolytic decomposition: When a substance is decomposed by electricity. It is called Electrolysis. For example: When electricity current is flow in sodium chloride then it is decomposed into two substance sodium and chlorine.

2NaCl                              2Na + Cl₂  

(c)     Photolysis: When a substance is decomposed by light. It is called Photolysis. For example: when we put silver chloride into sun light then it decomposed into silver and chloride.

AgCl                                  Ag + Cl₂

3. DESPLACEMENT REACTION

  In this type of reaction, one element has displaced or remove another element. This type of chemical reactions is called displacement reaction. For example:

Fe + CuSO₄                                    FeSO₄ + Cu

In this reaction, iron has displaced or remove copper element.

4. DOUBLE DISPLACEMENT REACTION

  In this type of reaction, two elements have displaced or remove another two elements. This type of chemical reactions is called double displacement reaction. For example:

AgNO₃ + NaCl                               AgCl + NaNO₃

In this reaction, silver nitrate and sodium chloride are converted into silver chloride and sodium nitrate.