Question

polyatomic ions
worksheet
exercise 4. provide the name for each compound.
cucn
feo
zno
al₂o₃
agcl
nh₄no₃
nano₃
nano₂
ca(no₂)₂
fecro₄

Explanation:

• CuCN: Copper(I) cyanide. Copper has a +1 oxidation state here, and cyanide ($CN^-$) is the polyatomic ion.
• FeO: Iron(II) oxide. Iron has a +2 oxidation state in this compound.
• ZnO: Zinc oxide. Zinc typically has a +2 oxidation state, and oxide ($O^{2 - }$) is the ion.
• Al₂O₃: Aluminum oxide. Aluminum has a +3 oxidation state.
• AgCl: Silver chloride. Silver has a +1 oxidation state.
• NH₄NO₃: Ammonium nitrate. Contains ammonium ($NH_4^+$) and nitrate ($NO_3^ - $) polyatomic ions.
• NaNO₃: Sodium nitrate. Sodium has a +1 oxidation state, and nitrate is the polyatomic ion.
• NaNO₂: Sodium nitrite. Nitrite ($NO_2^ - $) is the polyatomic ion.
• Ca(NO₂)₂: Calcium nitrite. Calcium has a +2 oxidation state.
• FeCrO₄: Iron(II) chromate. Iron has a +2 oxidation state, and chromate ($CrO_4^{2 - }$) is the polyatomic ion.

Answer:

• CuCN: Copper(I) cyanide
• FeO: Iron(II) oxide
• ZnO: Zinc oxide
• Al₂O₃: Aluminum oxide
• AgCl: Silver chloride
• NH₄NO₃: Ammonium nitrate
• NaNO₃: Sodium nitrate
• NaNO₂: Sodium nitrite
• Ca(NO₂)₂: Calcium nitrite
• FeCrO₄: Iron(II) chromate