Express your answer as a cheemical formula

Question

sodium phosphate:

 

zinc nitrate:

 

barium bromate:

 

iron(II) perchlorate:

 

cobalt(II) hydrogen carbonate:

 

chromium(III) acetate:

 

potassium dichromate:

Answer 1

Sodium Phosphate: Na₃PO₄

 

Zinc Nitrate: Zn(No₃)₂

 

Barium Bromate: Ba(BrO₃)₂

 

Iron (II) perchlorate: Fe(ClO₄)₂

 

cobalt (II) hydrogen carbonate: Co(HCO₃)₂ -----------this should be called cobalt bicarbonate

 

Chromium (III) acetate: Cr(C₂H₃O₂)₃

 

Potassium dichromate: K₂Cr₂O₇

Answer 2

Hi Latika,

 

They are asking you to use the elemental symbols from the periodic table to come up with the chemical formula for each compound.  This requires a knowledge of polyatomic ions and the electrical charge of each species, I've listed the answers below:

 

sodium phosphate: Na₃PO₄

 

zinc nitrate: Zn(NO₃)₂

 

barium bromate: Ba(BrO₃)₂

 

iron (II) perchlorate: Fe(ClO₄)₂

 

cobalt (II) hydrogen carbonate: Co(HCO₃)₂

 

chromium (III) acetate: Cr(C₂H₃O₂)₃

 

potassium dichromate: K₂Cr₂O₇

 

I also want to point out that the Roman numeral in front of certain metallic species means that the element is a transition metal (i.e. it has multiple possible charges).  Hope this helps!