Which substance is most likely to form in a precipitation reaction? a. calcium nitrate b. copper(i) nitrate c. iron(i) chloride d. iron(ii) sulfide e. potassium sulfate

D is the answer on this one

The answer is: D. iron(II) sulfide.

Iron(II) sulfide is black, water-insoluble solid.

Iron (Fe) is metal and sulfur (S) is nonmetal.

Iron has positive charge 2+ (cations) and sulfur negative charge 2- (anion), which means iron lost two electrons and sulfur gain two electrons.

Balanced chemical reaction: Fe + S → FeS.

trigonal pyramidal

tetrahedral

trigonal planar

bent

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6