Single replacement reactions and the activity series

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   In 2 Al + 3 Zn(NO₃)₂ → 2 Al(NO₃)₃ + 3 Zn, 4 aluminum atoms react. How many zinc atoms form, Ari?

   6 Zn atoms
2. 2.

   In 2 Al + 3 Zn(NO₃)₂ → 2 Al(NO₃)₃ + 3 Zn, 6 aluminum atoms react. How many zinc atoms form, Bo?

   9 Zn atoms
3. 3.

   In 2 Al + 3 Zn(NO₃)₂ → 2 Al(NO₃)₃ + 3 Zn, 10 aluminum atoms react. How many zinc atoms form, Esme?

   15 Zn atoms
4. 4.

   Iron meets copper(II) sulfate solution. What forms, Jun?

   • No reaction
   • FeSO₄ and Cu
   • FeCu and SO₄
5. 5.

   Magnesium meets dilute hydrochloric acid. What forms, Kira?

   • No reaction
   • MgH₂ and Cl₂
   • MgCl₂ and H₂
6. 6.

   Gold meets dilute hydrochloric acid. What forms, Luz?

   • AuH and Cl₂
   • AuCl₃ and H₂
   • No reaction
7. 7.

   Will iodine replace bromine in sodium bromide solution, Noah?

   • Yes: iodine is more active
   • No: iodine is less active
   • Yes: iodine is heavier
8. 8.

   Metal A replaces metal B from B's salt solution, but B can't replace A. Which is more active, Ren?

   • They are equal
   • B
   • A
9. 9.

   Zinc replaces copper, and copper replaces silver. Which order runs from most to least active, Tala?

   • Copper, zinc, silver
   • Silver, copper, zinc
   • Zinc, copper, silver
10. 10.

    A metal bubbles in dilute acid but not in cold water. Where does it sit on the ladder, Zee?

    • Below sodium, above hydrogen
    • Above potassium, at the top
    • Below hydrogen, above copper