yes it can
firn
Melted
No, you can take the melted chocolate goo and pour it into a mold, cool it and re-form the candy bar. No, melting a chocolate bar is not an irreversible change. Melting a chocolate bar is just changing its state of matter. If you but the melted chocolate bar in a freezer, where exothermic processes will occur, and the chocolate bar will be solid again.
It would depend on the type of chocolate bar you want to make. Usually the filling is assembled (whatever you choose to include) and then dipped in melted chocolate.
Someone melted a chocolate bar while working on a radar antenna.
writing chocolate is melting chocolate to a liquid form, then emptying the ink in your pen, refilling it with melted chocolate. I think. Or you can melt a chocolate bar till it is soft and write with it.
When you put a chocolate bar inside milk, the chocolate begins to dissolve due to the fat and sugar content in the chocolate. This process is known as diffusion, where the chocolate particles spread out evenly in the milk. The milk will take on a chocolate flavor and may also change in color depending on the amount of chocolate added.
Physical, Since only the property of the chocolate didn't change, after it melted, it still is chocolate
Chocolate doesn't rot, but it does melt. If a chocolate bar has gotten "hot" but not completely melted it will show streak of white in the chocolate, but it can still be eaten.
If you melt a Hershey bar, its density would change. Density is defined as mass divided by volume. When the chocolate melts, it typically occupies a smaller volume due to the loss of air pockets, but the mass remains the same. As a result, the melted chocolate may have a higher density compared to the solid bar.
no
Not at all. Any time chocolate candy is made, the chocolate is melted and solidified. Chocolate chips in chocolate chip cookies have melted and solidified.