Some reactions are reversible meaning both the forward and reverse reaction can take place.
An example of this is anmonium chloride decomposing to ammonia and hydrogen chloride.
When ammonium chloride is broken down, some of the ammonia and hydrogen chloride formed re-forms to remake ammonium chloride. This is known as an open reaction as the other ammonia and hydrogen chloride can escape.
If the experiment is sealed it is a closed reaction as substances cannot enter or leave, therefore all the product will re-form ammonium chloride.
After some time, the rate at which ammonium chloride breaks down will be equal to the rate it reforms, this is the state of equilibrium. Meaning the amount of each substance remains.
However, this does not mean that the substances on each side of the reaction are the same, sometimes the amount of the substance on one side will be more than the other.
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