Single replacement reactions and the activity series

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   In Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, 6 silver atoms form on a wire. How many copper atoms reacted, Ari?

   3 Cu atoms
2. 2.

   In Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, 10 silver atoms form on a wire. How many copper atoms reacted, Bo?

   5 Cu atoms
3. 3.

   In Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, 8 silver atoms form on a wire. How many copper atoms reacted, Esme?

   4 Cu atoms
4. 4.

   In Zn + Cu²⁺ → Zn²⁺ + Cu, which particle loses electrons, Jun?

   • The zinc atom
   • The sulfate ion
   • The copper ion
5. 5.

   In Cu + 2 Ag⁺ → Cu²⁺ + 2 Ag, why are two silver ions needed, Kira?

   • Copper has two outer shells
   • Cu gives 2 electrons; each Ag⁺ takes 1
   • Silver atoms travel in pairs in solution
6. 6.

   Milo says copper will replace zinc in zinc sulfate solution. Agree or disagree?

   • Disagree: copper is below zinc
   • Agree: copper is the heavier metal
   • Agree: copper is above zinc
7. 7.

   Pia says if zinc replaces copper, copper must also replace zinc. Agree or disagree?

   • Disagree: it runs one way
   • Agree: the two metals are equally active
   • Agree: the swap works both ways

8. Read this first

   Metal-in-solution results (example data)

   metal	in X nitrate	in Y nitrate	in Z nitrate
   X	not tested	coating forms	no change
   Y	no change	not tested	no change
   Z	coating forms	coating forms	not tested

9. 8.

   Using the results, which metal is the most active, Ren?

   • X
   • Z
   • Y
10. 9.

    Using the results, which order runs from most to least active, Tala?

    • Y, X, Z
    • Z, X, Y
    • X, Z, Y
11. 10.

    Using the results, why does Y show no change in either solution, Zee?

    • Y is the least active of the three
    • Y is the most active of the three
    • Y did not touch either of the solutions