Which equation obeys the law of conservation of mass? H2(g) O2(g) → H2O(g) H2(g) O2(g) → H2O(g) 4He(g) 2H2(g) O2(g) → 2H2O(g) H2(g) → H2O(g) H2(g) O2(g) → 2H2O(g).

How air particles exert a pressure on the inside of the balloon

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?