Is this reaction endothermic or exothermic?

2Na2O2(s) + 2H2O(l) → 4NaOH(s) + O2(g) + 126 kJ

Which term refers to a property that depends only on the amount of a substance? ©@

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.

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles