Which form of energy is commonly created as a byproduct whne energy changes from one form to another

Heat energy, also known as thermal energy, will be created! good luck!

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess