1. Pour chacun des 4 composés suivants: a) SF4 (tetrafluorure de soufre)
b) SO3 -2 (ion sulfite)
c) NH4 + (ion ammonium)
d) IF3 (trifluorure d'iode)
Donner:
i) La stucture de Lewis
ii) Le calcul des charges formelles pour chaque atome différent
iii) La géométrie électronique et moléculaire du composé
iv) La représentation 3D avec la polarité des liens et le moment dipolaire du composé
v) Identifier les interactions intermoléculaires possibles entre les composés a) et b) et entre c)
et d) (Question non anonyme )

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

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.

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.