What is heat on a molecular level?

Answer 1

Heat is not a molecule, it's a form of energy. It is conducted from molecule to molecule

in conduction and convection (not in heating by radiation).

Molecules with high kinetic energy give their energy to molecules with low kinetic energy , that's how heat is conducted.

Answer 2

On a molecular level heat is a vibration of molecules. That "thermal vibration" is the chaos at the molecular level. Each molecule has its thermal energy. Only strong bonds (example: covalent bonds) or multitudes of weak bonds (example: hydrogen bond) can withstand thermal energy at room temperature. Even though a single weak bond cannot withstand this intense vibration, a weak bond can play a role in keeping molecules together.

Answer 3

As heat is transferred via heat to the solid, it is absorbed by the molecules to increase the average energy of each molecule - eventually giving some molecules enough energy to allow them to move away from the other molecules they were bound to in the solid and form a liquid phase - which on a macroscopic level we experience as melting.

Answer 4

Heat is a form of energy which causes the molecules in a solid to move faster, and to overcome the intermolecular forces holding the molecules together. This then results in a phase change from a solid to a liquid, and this is called melting.

Answer 5

Heat on a molecular level is energy that depends on the excited movement of atoms. This movement can either create heat or be stimulated by heat.