yes
No. If you bought the bar of chocolate, melting it does not make it homemade.
no
A chocolate bar left in the sun will melt unless ambient temperature is very cold.
Maybe by leaving it out in the open air for too long will cause it to melt.
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.
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.
The temperature in a closed car on a hot summer day quickly exceeds 120-125 degrees F, more than hot enough to melt any chocolate.
If you're asking what candies melt than chocolate (hersheys melt the best) is your answer. A microwave will show you that if you put one in.
Heat transfer. The oven is warmer than the chocolate bar, which is solid at room temperature. The difference in temperature means that heat will transfer from the warmer oven to the chocolate bar. Chocolate melts at ~36*C, so if enough energy is added to the chocolate, the temperature will rise until it reaches 36*C and begins to melt.
Carmel chocolate melts faster. On the inside. Of the chocolate there is caramel so the caramel would quickly heat up and melt. The caramel would be so hot it would quickly melt the chocolate around it.
The melting point of a chocolate bar can vary depending on its ingredients, but on average, it is around 86-90°F (30-32°C). At this temperature, the cocoa butter in the chocolate begins to soften and melt, giving it a smooth and creamy texture.