When writing equations into Formative:
Place a "space" between coefficients and formulas, between "+" signs and formulas.
Place a "space" between formulas and states of matter and make sure states of matter are in parentheses.
For the reaction "arrow", use "two dashed lines" and a "greater than" sign and make sure there is a space before and after the arrow.
Final equation: 2 H2 + O2 --> 2 H2O
*** If you use these rules, then Formative will grade your work correctly and you will get all your points.