Science 9 · Unit 5: Reactivity · Cambridge Lower Secondary Science Stage 9

Questions

1. 1. Sodium burns brightly when heated. How does magnesium react when heated, compared with sodium?

   • less vigorously
   • more vigorously
   • the same
   Check

2. 2. Copper reacts very slowly when heated. How would silver react when heated?

   • it would explode
   • even more slowly, or not at all
   • very vigorously
   • faster than copper
   Check

3. 3. Lead reacts very slowly with dilute acid. How would iron react with dilute acid, compared with lead?

   • faster than lead
   • slower than lead
   • not at all
   Check

4. 4. An iron nail is put in copper sulfate solution. What is the word equation?

   • copper sulfate + iron → copper oxide + iron
   • copper sulfate + iron → iron sulfate + copper
   • copper sulfate + iron → no reaction
   • copper + iron sulfate → iron + copper sulfate
   Check

5. 5. A copper nail is put in iron sulfate solution. Is there a displacement reaction?

   • No, because copper is less reactive than iron.
   • Yes, copper displaces iron.
   Check

6. 6. Which metal can NOT displace copper from copper sulfate?

   • iron
   • silver
   • magnesium
   • zinc
   Check

7. 7. Metal X displaces lead from lead chloride but not zinc from zinc chloride. What could X be?

   • iron
   • magnesium
   • copper
   • silver
   Check

8. 8. Will zinc and copper sulfate react to give copper?

   • Yes
   • No
   Check

9. 9. Will lead and magnesium chloride react to give magnesium?

   • Yes
   • No
   Check

10. 10. Will copper and aluminium chloride react to give aluminium?

    • Yes
    • No
    Check

11. 11. Will zinc and iron chloride react to give iron?

    • Yes
    • No
    Check

12. 12. Will iron and lead chloride react to give lead?

    • Yes
    • No
    Check

13. 13. What is the word equation for magnesium reacting with zinc chloride?

    • zinc + magnesium chloride → zinc chloride + magnesium
    • magnesium + zinc chloride → magnesium chloride + zinc
    • magnesium + zinc chloride → no reaction
    • magnesium + zinc chloride → magnesium + zinc + chlorine
    Check

14. 📖 This question is about a text that students read in the app.

    14. Zinc displaces copper from copper sulfate. What does this tell you?

    • Zinc is not a metal.
    • They are equally reactive.
    • Zinc is more reactive than copper.
    • Copper is more reactive than zinc.
    Check

15. 15. What is the word equation for the reaction between zinc and copper sulfate?

    • copper + zinc sulfate → copper sulfate + zinc
    • zinc + copper sulfate → zinc sulfate + copper
    • zinc + copper sulfate → copper oxide + zinc
    • zinc + copper sulfate → no reaction
    Check

16. 📖 This question is about a text that students read in the app.

    16. There is no reaction between zinc and magnesium sulfate. What does this tell you?

    • Magnesium sulfate is not a salt.
    • Zinc is more reactive than magnesium.
    • Zinc and magnesium are the same.
    • Magnesium is more reactive than zinc.
    Check

17. 📖 This question is about a text that students read in the app.

    17. Use the table. Put iron, copper and magnesium in order of reactivity, most reactive first.

    • magnesium, copper, iron
    • magnesium, iron, copper
    • copper, iron, magnesium
    • iron, magnesium, copper
    Check

18. 18. Sofia's metal is zinc, iron, copper or silver. It displaces copper from copper sulfate but not iron from iron sulfate. Which metal is it?

    • zinc
    • copper
    • iron
    • silver
    Check

19. 19. How could you tell iron and zinc apart using a displacement reaction?

    • Add each to iron sulfate. Only zinc will displace the iron.
    • Add each to copper sulfate. Only iron reacts.
    • Add each to silver nitrate. Only zinc reacts.
    • Add each to magnesium sulfate. Only iron reacts.
    Check

20. 📖 This question is about a text that students read in the app.

    20. In Arun's experiment, which metal is the most reactive?

    • E
    • C
    • B
    • D
    Check