How chemical equations demonstrate conservation of mass?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Non renewable resources like petroleum eventually

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods