Name covalent compounds with prefixes

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   A gas sample holds 5 CO₂ molecules and 2 CO molecules. How many oxygen atoms does it hold, Bo?

   12 atoms
2. 2.

   A gas sample holds 6 CO₂ molecules and 6 CO molecules. How many oxygen atoms does it hold, Esme?

   18 atoms
3. 3.

   How is penta- + oxide written, Kira?

   • Pentoxide
   • Pentoxyde
   • Pentaoxide
4. 4.

   In covalent names, how does the second element's name end, Luz?

   • In -ide
   • In -ate
   • In -ite
5. 5.

   Milo names MgCl₂ magnesium dichloride. Agree or disagree?

   • Disagree: ionic names skip prefixes
   • Agree: it has two chlorines
   • Agree: prefixes give counts
6. 6.

   Noah names Al₂O₃ dialuminum trioxide. Agree or disagree?

   • Agree: oxides take prefixes
   • Disagree: it is aluminum oxide
   • Agree: 2 Al and 3 O need prefixes
7. 7.

   Pia says carbon monoxide and carbon dioxide are the same compound. Agree or disagree?

   • Agree: both are carbon and oxygen
   • Disagree: they differ in oxygens
   • Agree: both are gases
8. 8.

   How do carbon monoxide and carbon dioxide differ, Ren?

   • By one carbon atom
   • By one oxygen atom
   • They don't differ
9. 9.

   How many atoms in all are in one sulfur dioxide molecule, Tala?

   • 4
   • 3
   • 2
10. 10.

    How does dinitrogen monoxide's formula differ from nitrogen dioxide's, Zee?

    • They are the same
    • N₂O₂ against NO
    • N₂O against NO₂