There are two types of reaction, irreversible reaction and reversible reaction. The first reaction you have learnt till now. This reaction uses one arrow . This means that the reactants totally or completely react and form new substances.
This reaction is included neutralization, redox, decomposition, etc. In these reactions, all the reactants or one of the reactants are limited, after reaction no more reactants left or one of the reactant is nothing.
The second reaction uses two arrow; it means that the reaction can be occured in two directions, forward reaction and reverse reaction. This reaction can be occured in a closed system, so no substance will escape. If the reaction includes a gas, we have to close the equipment. If the reaction doesn' involve a gas, for example solid and liquid, so it doesn't need to close the equipment. The substances close theirselves. Because the closed system, so the reactants collide and form the products. At the same time the products collide and form the reactants again.
The example of both reactions are :
Zn(s) + HCl(aq) --> ZnCl2(aq) + H2(g) In the openned system.
N2(g) + 3 H2(g) = 2 NH3(g) In the closed system.
This reaction is included neutralization, redox, decomposition, etc. In these reactions, all the reactants or one of the reactants are limited, after reaction no more reactants left or one of the reactant is nothing.
The second reaction uses two arrow; it means that the reaction can be occured in two directions, forward reaction and reverse reaction. This reaction can be occured in a closed system, so no substance will escape. If the reaction includes a gas, we have to close the equipment. If the reaction doesn' involve a gas, for example solid and liquid, so it doesn't need to close the equipment. The substances close theirselves. Because the closed system, so the reactants collide and form the products. At the same time the products collide and form the reactants again.
The example of both reactions are :
Zn(s) + HCl(aq) --> ZnCl2(aq) + H2(g) In the openned system.
N2(g) + 3 H2(g) = 2 NH3(g) In the closed system.
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