What will happen to the state of the substance the atomic or molecular activity and the shape of the graph when thermal energy is added?

When thermal energy is added to a substance, the atomic or molecular activity will increase, leading to higher kinetic energy of the particles. This results in the substance changing states from solid to liquid, and then to gas, if the temperature continues to rise. The shape of the graph will show an increase in temperature with corresponding changes in state, known as phase transitions.