Which chemical equation is unbalanced?
O C + O2 → CO2
O Sr + O2 → 2Sro
6H2 + 302 -> 6H20
O H2 + H2 + O2 → H2O + H2O

Is this a single replacement reaction or there is no

Which of the following are correct values for the ideal gas laws constant r

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal