Question

I think I get ionic compounds now. I'm just a bit unsure about my answers for these ones.

4. The cation is Au^3+ and the anion was SiO3subscript^-2. For the compound, I wrote (Au subscript2)subscript SiOsubscript3. Is this correct? Would it be called Gold Silicate then?

5. Fe^2+ cation and Cr2(subscript) O7subscript ^-2. I wrote the compound as FeCr2subscript O7subscript. IS this correct? WOuld it then be called Iron Chromide?

3. What happens if you have an anion without Oxygen in it? FOr example I^-1 How would you name this?

Thanks for your help!!

Answer 1

First it is better to leave the words "subscript" out of the discussion. I know that not being able to write subscripts and superscripts makes chemistry even more confusing but with a little practice we can accommodate it. Second, I think you mean superscript when you sometimes write subscript. For example, I think SiO3^-2 is the silicate you speak of. The -2 is a superscript and we show it with a caret sign. The 3 we understand by mutual consent to be a subscript without writing it in.
For gold silicate I would write it as Au2(SiO3)3.
For iron(II) dichromate I would write it as FeCr2O7. The formula you have is correct; the name you have is not correct.

For Fe^+2 and I^-, the compound is FeI2 and named iron(II) chloride. The older name of ferrous chloride is being phased out.
For Fe^+3 and I^-, I would write FeI3 and name it iron(III) iodide. The older name is ferric iodide.
I hope this answers all of your questions. Thanks for using Jiskha.

Answer 2

4. The cation is Au^3+ and the anion was SiO3subscript^-2. For the compound, I wrote (Au subscript2)subscript SiOsubscript3. Is this correct? Would it be called Gold Silicate then?
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yes 3*2 = 2*3 for neutral salt. I suppose your name for it will do.

5. yes two = two
I think FeCr2O4 is iron chromite. I guess this might be chromate

6. Iodide eg : potassium iodide = KI

Answer 3

Ignore anything I said. DrBob is a chemist.