CHEMICAL EQUATION

 

CHEMICAL EQUATION:--

                                     A chemical equation is the symbolic representation of the substance that undergoes the chemical change during chemical reaction in which reactants and products are expressed in the form of symbols and formulae.

  magnesium  +  oxygen     --------------à              Magnesium Oxide

 (reactants)                                                        (products)

 

Here, reactants are given on the left-hand side (LHS)

And products are given on the right-hand side (RHS)

 Reactants:--

                     The substances that undergoe chemical change in the reaction are called as reactants. Here , reactants are written in the left hand sided (LHS).

 

Products:--

                   The substance is formed during chemical reaction is known as the products. And the products are written in the right hand side (RHS).

 

Point to be noted that the arrow which is pointed towards the products and shows the direction of the reaction.

 

The following observations that helps us to determine the chemical reaction takes place:--

 

Change in state

Change in colour

Evolution of a gas

Change in temperature

 

 

Chemical reaction :--

                         The transformation of the chemical substance into another chemical substance is known as chemical reaction.

 

 

To write a chemical equation

 

A chemical equation represents the chemical reaction.

The reactants are written on left-hand side (LHS)

The products are written on the right-hand side (RHS)

And an arrow represents the direction of the chemical reaction takes place.

Count and compare the number of atoms of each element on both LHS and RHS.

The equation is balanced if the number of the atoms of each element is the same on both the sides.

The equation is unbalanced because the mass is not same on both sides of the chemical equation. Such a chemical reaction is a skeleton chemical equation for the reaction.  

 

 

The following symbols are used  to describe the physical state of reacting entities during the reaction :--

The symbol (s) for the solid state

The symbol (l) denotes for the liquid state

The symbol (g) denotes for gaseous state

The symbol (aq) denotes for an aqueous solution

 

The symbol (   )  denotes for precipitates , which is insoluble in the solution that the reaction takes place.

 

 

 

 

 

 

 

 

 

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