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TOPIC: CHEMICAL REACTIONS
CONTENTS:
PERIOD 1: CHEMICAL EQUILIBRIUM
Studies have shown that some reactions are such that all the reactants are never completely converted into products. In such reactions, the products are converted into the reactant as they are been formed.
A reaction is said to be reversible, if it can be made to proceed forward and backward, under a given set of conditions.
For a chemical reaction involving a gas to be reversible, it must be carried out in a closed vessel, i.e. an isolated or closed system. Two opposing arrows in a chemical equation represent a reversible reaction:
Such reactions usually have relatively low activation energies for the reverse reactions.
A reaction in which the products cannot readily be combined to give the reactants is said to be irreversible. In such a reaction, a single arrow is used pointing to the product(s), e.g. combustion reactions
Such reactions usually have relatively high activation energies for the reverse reaction.
REACTIONS AT EQUILIBRIUM
Dynamic Equilibrium
When the rates of forward and backward reactions in a reversible reaction are equal, the reaction is said to be at equilibrium. At equilibrium, both the forward and backward reactions are still going on, but because there rates are the same, the concentrations of the reactants and products do no longer change with time. Hence, chemical equilibrium is dynamic and not static.
How to Identify a Reaction at Equilibrium
At equilibrium, certain observable properties become constant depending on the type of reaction. Such properties include;
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