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?

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

   Gold meets dilute hydrochloric acid. What forms, Luz?

   • AuH and Cl₂
   • AuCl₃ and H₂
   • No reaction
6. 6.

   Chlorine meets potassium bromide solution. What forms, Milo?

   • No reaction
   • KCl₂ and Br
   • KCl and Br₂
7. 7.

   Will iodine replace bromine in sodium bromide solution, Noah?

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

   Which halogen is the most active in the series, Pia?

   • Bromine
   • Fluorine
   • Iodine
9. 9.

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

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

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

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