Name ionic compounds, including polyatomic ions

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   A sample holds 5 formula units of calcium nitrate. Each has 2 nitrate ions of 3 oxygens. How many oxygen atoms does the sample hold, Ari?

   30 atoms
2. 2.

   A sample holds 4 formula units of aluminum sulfate. Each has 3 sulfate ions of 4 oxygens. How many oxygen atoms does the sample hold, Bo?

   48 atoms
3. 3.

   A sample holds 10 formula units of calcium phosphate. Each has 2 phosphate ions of 4 oxygens. How many oxygen atoms does the sample hold, Esme?

   80 atoms
4. 4.

   What is the name of Fe₂O₃, rust, Kira?

   • Diiron trioxide
   • Iron(II) oxide
   • Iron(III) oxide
5. 5.

   What is the formula of copper(II) oxide, Luz?

   • CuO₂
   • Cu₂O
   • CuO
6. 6.

   Milo names CaCl₂ calcium dichloride. Agree or disagree?

   • Agree: there are two chlorides
   • Agree: prefixes show counts
   • Disagree: ionic names skip prefixes
7. 7.

   Pia names NaCl sodium(I) chloride. Agree or disagree?

   • Disagree: sodium has one charge
   • Agree: it shows one sodium
   • Agree: numerals go on metals
8. 8.

   What is the formula of aluminum sulfate, Ren?

   • AlSO₄
   • Al₃(SO₄)₂
   • Al₂(SO₄)₃
9. 9.

   What is the formula of ammonium chloride, Tala?

   • NH₄Cl
   • NH₄Cl₂
   • (NH₄)₂Cl
10. 10.

    What is the formula of calcium phosphate, Zee?

    • Ca₂(PO₄)₃
    • Ca₃(PO₄)₂
    • CaPO₄