Name ionic compounds, including polyatomic ions

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Calcium nitrate has 2 nitrate ions per formula unit, each with 3 oxygen atoms. How many oxygen atoms are in one formula unit, Ari?

   6 atoms
2. 2.

   Aluminum sulfate has 3 sulfate ions per formula unit, each with 4 oxygen atoms. How many oxygen atoms are in one formula unit, Bo?

   12 atoms
3. 3.

   Calcium phosphate has 2 phosphate ions per formula unit, each with 4 oxygen atoms. How many oxygen atoms are in one formula unit, Esme?

   8 atoms
5. 4.

   On the card, what does each bracket stand for, Jun?

   • One calcium ion
   • One oxygen atom
   • One nitrate ion
6. 5.

   On the card, why are there two nitrate brackets, Kira?

   Use the picture in question 4.

   • Calcium has two shells
   • Nitrogen atoms come in pairs
   • Two 1− ions balance one 2+
7. 6.

   On the card, why is it named calcium nitrate and not calcium nitride, Luz?

   Use the picture in question 4.

   • The whole NO₃ unit is nitrate
   • Nitride is the name for two nitrogens
   • Calcium is named last
8. 7.

   What is the name of NaCl, Milo?

   • Sodium chlorine
   • Sodium chloride
   • Chlorine sodide
9. 8.

   What is the name of MgO, Noah?

   • Magnesium oxygen
   • Magnesium oxide
   • Magnesium dioxide
10. 9.

    What is the name of the ion CO₃²⁻, Ren?

    • Carbon trioxide
    • Carbide
    • Carbonate
11. 10.

    What is the name of the ion NH₄⁺, Zee?

    • Ammonia
    • Ammonium
    • Nitride