Balance las siguientes ecuaciones por el método de tanteo: a. ZnCO3 + H3PO4 → Zn3(PO4)2 + H2CO3
b. La(HCO3)2 + H2SO4 → La2(SO4)3 + H2O + CO2
c. N2 + H2 → NH3
d. Fe2O3 + C → Fe + CO

The wilson chamber is used to study: direction, speed, and distance of radioactivity the intensity of radiation the appearance of individual atoms all of the above

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

In 2002, the rare earth elements mine in mountain pass, california was closed because