Yes, the succinic acid molecules have been changed by the process of heating.
A chemical change in chemistry is any process in which reactants are changed into products by the breaking or creation of chemical bonds.
One notable feature of chemical changes is the evolution of gas.
According to this question, succinic acid, a white solid that melts at 182°C, is heated gently, and a gas is given off. However, after the gas evolution stops, a white solid remains that melts at a temperature different from 182°C.
The formation of a white solid as a residue suggests that a new product has been formed. Also, the evolution of gas tells us that chemical bonds have been broken to release products.
Therefore, the succinic acid molecules have been changed by the process of heating.
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