When a thermosoftening material is heated up, it softens further and may eventually melt into a liquid state. This is due to the weakening of intermolecular forces within the material upon heating, allowing its molecular structure to become more fluid-like and flexible.
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If slate is sufficiently heated and compressed it becomes phyllite.
phyllite
If a hydro-carbon is burnt it will make heat, CO2 and water however if a hydro-carbon is heated it will just expand into its surroundings
Bromthymol Blue, when heated in a solution, indicates carbon dioxide. If there is carbon dioxide in the solution, it will turn bright yellow (when heated).
Copper(II) nitrate will turn from green to black when heated due to the decomposition of the compound. The green color is due to the presence of copper ions, which decompose into copper oxide when heated, resulting in the color change to black.