Need help with... naming ionic compounds...QUIZ tommarow! please help?

Question

i have a quiz tommarrow on this material....a sample question is name this type 2 ionic compound...the first one is, " CuCl(2) " and the answer is, "copper II chloride". the teacher told me this answer which is how i know it. the next one is, " Fe(2)S(3) " and i dont know the answer, im not interested in the answer but more how to do these problems, i understand how to get the "copper chloride" part but not the "II" part, how do you determine the value of the roman numeral

Answer 1

This is not so difficult. The trick is that all positive charges must equal negative charges. Cl has -1. So,

Cu charges = Cl charges
= -1 X 2
CU charges = 2, So we have Copper II (Copper 2)

For Fe(2)S(3), S has -2 charges
So,

2 x Fe = 3 x (-2)
2Fe = -6
Fe = -6/2 = -3
So we have Iron (III) Sulphide or simply Iron Sulphide

To learn more, check your local library or text for similar equations.

Answer 2

it's very simple. for metal-nonmetal compounds, it's just the name of the metal element followed by the nonmetal, usually with "ide" at the end. For CuCl2, the Cu's charge is +2 because chlorine's is negative one, and there are two of it, so Cu must be +2 to balance it to be neutral. for Fe(2) S(3), Fe's charge would be +3 because S's is -2, and 3 of negative two is a charge of -6, so there needs to be a total of +6 to balance that out-- there are two Fe ions, so if Fe's charge is +3, then it works. then just put the charge of the metal as the roman numeral. the answer would be Iron III sulfide.

Answer 3

You must know that in the case of chlorine, one electron is taken away from copper for each chlorine atom. So 2 chlorine atoms is 2 electrons, giving copper a +2 charge, indicated by "II."
Sulfur takes 2 electrons apiece, so the iron (6/2) would end up being "III."
Study the table of elements to know the electron number.
http://www.en.wikipedia.org/wiki/Chemical_element
http://www.chemtutor.com

Answer 4

Iron (III) sulphide

Answer 5

i don't know but maybe iron disulfate.