How many valence electrons does aresenic ave.

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same