Name covalent compounds with prefixes

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   Each carbon dioxide molecule has 1 carbon and 2 oxygen atoms. How many atoms in all are in 4 molecules, Ari?

   12 atoms
2. 2.

   Each water molecule has 2 hydrogen and 1 oxygen atom. How many atoms in all are in 5 molecules, Bo?

   15 atoms
3. 3.

   Each sulfur dioxide molecule has 1 sulfur and 2 oxygen atoms. How many atoms in all are in 6 molecules, Esme?

   18 atoms

4. Read this first

   Prefixes for covalent names (IUPAC)

   prefix	number
   mono-	1
   di-	2
   tri-	3
   tetra-	4
   penta-	5
   hexa-	6

5. 4.

   Using the table, which prefix means 5, Jun?

   • hexa-
   • penta-
   • tetra-
6. 5.

   Using the table, what is the formula of sulfur hexafluoride, Kira?

   • S₆F
   • SF₆
   • SF₅
7. 6.

   What is the formula of dinitrogen monoxide, Milo?

   • N₂O₂
   • N₂O
   • NO₂
8. 7.

   What is the formula of silicon dioxide, Noah?

   • SiO
   • SiO₂
   • Si₂O
9. 8.

   Why is MgO named magnesium oxide and not magnesium monoxide, Ren?

   • Mono- isn't a real prefix
   • Magnesium has 2 electrons
   • It is ionic, so no prefixes
10. 9.

    Why does carbon dioxide's name use a prefix, Tala?

    • It joins two nonmetals
    • Carbon is a metal
    • Prefixes appear in each name
11. 10.

    Which kind of compound is SO₂, Zee?

    • Ionic
    • Metallic
    • Covalent