# Know what Chemical Equilibrium is and become an expert at learning!

When no net changes occur in the amounts of reactants and products, a reverse chemical reaction takes place. It is called chemical equilibrium.

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## Chemical Equilibrium

A chemical reaction can be two types; reversible and irreversible reactions. Reversible reactions always move in forward as well as backward directions whereas irreversible reactions can move only in one direction.

## Top things to learn under Chemical Equilibrium from the online tutor

Let’s have a quick glance at those reasons:

• Chemical equilibrium is a state where both the products and reactants are present in concentration. These have no tendency to change even with time. And hence, there is no observable change in the various properties of the system.
• Chemical equilibrium can be shifted due to temperature, pressure,  concentration of a system, and volume. So, whenever certain changes happen, it results in achieving a new state of chemical equilibrium.
• Without chemical equilibrium, life would not be possible. Even our bodies go through chemical reactions every day.
• Some facts on chemical equilibrium and how they are useful in practical life.

Question 1: How does chemical equilibrium occur?

Chemical equilibrium is a stage of reversible reaction at which the rate of forward reaction and backward reaction become equal to each other. It looks like reaction stopped at that time but it remains in both directions so it is also called dynamic equilibrium.

Question 2: What is the change in free energy of a system at chemical equilibrium?

During a reversible chemical reaction, the concentration of reactants decreases and concentration of product increases. Therefore for forward reaction, the difference in free energy decreases and at equilibrium the free energy of the products and reactants are equal. Hence the free energy change at equilibrium is considered as zero.

Question 3: Select which reactions will usually be irreversible regarding chemical equilibrium in human bodies.

In the human body, there are various biochemical reactions that are responsible for all the biochemical processes.  Some of the reactions are reversible whereas some are irreversible also.

The conversion  of glucose to carbon dioxide and water is an example of irreversible chemical equilibrium in human bodies.

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