A spontaneous change is one that occurs on its own.
A spontaneous process is a process which has a natural tendency to occur in one direction , It has no relation with the speed , It can be fast or it can be slow but it doesn't require any external factors to happen.
such reactions might not face change in energy but it will see change in the way the matter or energy is distributed
The example of a spontaneous reaction is the decay of radioactive elements.
Example of Spontaneous Process is also water flowing downhill, it has the natural tendency to flow in that direction.
A spontaneous change is one that occurs on its own.
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