How does the concept of conservation of mass apply to chemical reactions?a. The reactants and products have exactly the same atoms. b. The reactants and products have exactly the same molecules. c. The change in the amount of matter is equal to the change in energy. d. The change in the amount of matter is only a small percentage of the total mass.

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99

What 3 categories are elements divided