Is ice forming and then melting back into water a physical change

100 points answer quick 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 number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)