When two or more atoms react and are combined chemically are called molecules. The drawing of the atoms and the molecules shows a chemical change.
A chemical change is a type of irreversible change that is formed when the atoms or the molecules react chemically to produce another type of substance.
A phase change is a change in the state of the matter, a physical change is a reversible change that modifies the structure and molecular reversal is a conversion process of the reactants into products and vice versa.
Therefore, the image shows the option C. chemical change.
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