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

Questions

1. 1. Which acid makes chlorides?

   • hydrochloric acid, HCl
   • nitric acid, HNO₃
   • citric acid
   • sulfuric acid, H₂SO₄
   Check

2. 2. Which acid makes sulfates?

   • citric acid
   • nitric acid, HNO₃
   • sulfuric acid, H₂SO₄
   • hydrochloric acid, HCl
   Check

3. 3. Which acid makes nitrates?

   • hydrochloric acid, HCl
   • nitric acid, HNO₃
   • sulfuric acid, H₂SO₄
   • citric acid
   Check

4. 4. What is the formula of sulfuric acid?

   • H₂SO₄
   • HCl
   • NaCl
   • HNO₃
   Check

5. 5. Which acid was used to make magnesium chloride?

   • citric acid
   • sulfuric acid
   • nitric acid
   • hydrochloric acid
   Check

6. 6. Which acid was used to make magnesium sulfate?

   • sulfuric acid
   • hydrochloric acid
   • citric acid
   • nitric acid
   Check

7. 7. Which acid was used to make magnesium nitrate?

   • hydrochloric acid
   • nitric acid
   • citric acid
   • sulfuric acid
   Check

8. 8. What is the name of NaCl?

   • sodium nitrate
   • sodium chloride
   • sodium sulfate
   • nickel chloride
   Check

9. 9. What is the name of CuSO₄?

   • copper chloride
   • copper sulfate
   • calcium sulfate
   • copper sulfide
   Check

10. 10. What is the name of CuCl₂?

    • calcium chloride
    • copper chlorate
    • copper sulfate
    • copper chloride
    Check

11. 11. What is the name of KNO₃?

    • potassium nitrate
    • krypton nitrate
    • potassium nitride
    • potassium sulfate
    Check

12. 12. Citric acid is found in fruit. What are its salts called?

    • citrates
    • citrides
    • citrous
    • citric salts
    Check

13. 13. How could you make zinc nitrate using zinc metal?

    • Add zinc to sulfuric acid.
    • Add zinc to water.
    • Heat zinc on its own.
    • Add zinc to nitric acid until no more reacts, filter, then evaporate.
    Check

14. 14. What is made when zinc reacts with nitric acid?

    • zinc nitrate + hydrogen
    • zinc oxide + hydrogen
    • zinc sulfate + hydrogen
    • zinc nitrate + water
    Check

15. 15. Why can't silver sulfate be made by adding silver to sulfuric acid?

    • Silver is too unreactive to react with the acid.
    • Silver reacts too violently.
    • Silver dissolves in water.
    • Sulfuric acid is too weak.
    Check

16. 16. Why can't potassium sulfate be made by adding potassium to sulfuric acid?

    • Potassium sulfate does not exist.
    • Potassium reacts dangerously violently.
    • Potassium is too unreactive.
    • Potassium is not a metal.
    Check

17. 17. Copper sulfate is made by warming copper oxide with sulfuric acid. Why must the mixture not boil?

    • Boiling turns the salt into a gas.
    • Boiling acid could spit and burn someone.
    • Copper oxide melts when boiled.
    • Boiling makes the acid stronger.
    Check

18. 18. What is the word equation for copper oxide and sulfuric acid?

    • copper oxide + sulfuric acid → copper sulfate + hydrogen
    • copper oxide + sulfuric acid → copper sulfate + water
    • copper + sulfuric acid → copper sulfate + water
    • copper oxide + sulfuric acid → copper + water
    Check

19. 19. What is the word equation for magnesium and nitric acid?

    • magnesium + nitric acid → magnesium nitrate + hydrogen
    • magnesium + nitric acid → magnesium nitride + water
    • magnesium + nitric acid → magnesium oxide + hydrogen
    • magnesium + nitric acid → magnesium nitrate + water
    Check

20. 20. What is the word equation for copper oxide and nitric acid?

    • copper oxide + nitric acid → copper sulfate + water
    • copper oxide + nitric acid → copper nitrate + hydrogen
    • copper oxide + nitric acid → copper + water
    • copper oxide + nitric acid → copper nitrate + water
    Check