Why a plastic spoon in hot chocolate feel hot?

Plastic spoons feel hot in hot chocolate because they conduct heat better than your fingers. When you touch the plastic spoon, heat from the chocolate is transferred to your skin through the spoon. Your skin feels this heat and interprets it as a burning sensation.

The rate at which heat is transferred through a material is called its thermal conductivity. The higher the thermal conductivity, the faster heat is transferred. The thermal conductivity of plastic is much higher than that of flesh. Thus heat easily transfers, thus giving a perception of hotness