A synthesis would be A+B-->AB its combining, decomposition is AB-->A+B, its the breaking up of a substance.
Diamond does not conduct electricity because it has no delocalized electron to conduct electricity.
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. Hope this helps!
Answer:
The answer is Hg.
Explanation:
Symbol for Mercury is Hg.