3. Heating by direct contact between particles is called

I believe it is “Conduction” im not 100% sure tho, I haven’t done this since the 7th grade.

The think of process to make something successful

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.