Name covalent compounds with prefixes

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Each carbon dioxide molecule has 2 oxygen atoms. How many oxygen atoms are in 5 molecules, Ari?

   10 atoms
2. 2.

   Each sulfur dioxide molecule has 2 oxygen atoms. How many oxygen atoms are in 12 molecules, Bo?

   24 atoms
3. 3.

   Each dinitrogen monoxide molecule has 2 nitrogen atoms. How many nitrogen atoms are in 7 molecules, Esme?

   14 atoms
5. 4.

   On the card, what does di- in dioxide tell you, Kira?

   • There are two oxygen atoms
   • There are two bonds in the molecule
   • There are two carbon atoms
6. 5.

   On the card, why isn't it called monocarbon dioxide, Luz?

   Use the picture in question 4.

   • Carbon has no prefix form
   • Mono- means zero
   • The first element skips mono-
7. 6.

   What number does the prefix tri- stand for, Milo?

   • 3
   • 2
   • 4
8. 7.

   What number does the prefix tetra- stand for, Noah?

   • 3
   • 5
   • 4
9. 8.

   What number does the prefix mono- stand for, Pia?

   • 2
   • 1
   • 6
10. 9.

    What is the name of CO, Ren?

    • Carbon oxide
    • Carbon monoxide
    • Monocarbon oxide
11. 10.

    Using only the prefix rules, what would H₂O be called? (Chemists just call it water.) Zee decides.

    • Monohydrogen oxide
    • Hydrogen dioxide
    • Dihydrogen monoxide