Heat is the energy that flows from a warmer substance to a cooler one. Touch something warm and the energy flows into your hand. This is the Second Law of Thermodynamics. Heat is the thermal energy of a substance or how fast the atoms are moving or vibrating. There is not a max temperature. Solids change to liquid, liquid to gas and in space gas to plasma as the atoms loose there electrons and a cloud of electrically charged particles form. There is an absolote zero though, this is where atoms lose all of there kinetic energy. The third law states we cannot reach absolute zero.
We'll experiment with frozen gas, CO2.
We'll eperiment with chemical reactions that release heat, light or sound - exothermic and those that absorb heat - endothermic.
The students will take home zinc sulfide that glows and produces cool light. We'll make glowing putty. You canexperiment to make your own cool chemistry at home.