What two requirements must be met for reacting particles to react according to rate of reaction

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

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?

Express your answer using two significant figures. 1.7 km^2