A) Fe(s) + Cl²(g)=> FeCl³ b) Na²CrO⁴(ac) + CaS(ac)=> CaCrO⁴=> +Na²S(ac)
c) C²H⁶ + O²=> Co² + H²O
d) Cl² + H²S=> HCl + S

Calculate the expected ph values of the buffer systems from the experiments (a, b,c, d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false