Classify as endothermic or exothermic (a) a combustion reaction for which DrH3 = −2020 kJ mol−1 , (b) a dissolution for which DH3 = +4.0 kJ mol−1 , (c) vaporization, (d) fusion, and (e) sublimation.

What is avogadro’s number, and why is it useful

Modern weaponry has increased the number of deaths in wars and violent conflicts.

Me i dont know what to do! 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.