Worksheet Chapter 4: Reactivity of Metals

1. Compare the reactivity of Zinc and Lead towards oxygen, and describe the visual observations when both metals are strongly heated in air.

2. Fill in the blank: Minerals that occur naturally as free elements because of their low chemical reactivity are known as ____________ minerals.

3. True or False: In a blast furnace, slag floats above molten iron because slag has a lower density than iron.

4. Explain why carbon powder can be used to extract iron from hematite ($Fe_2O_3$), but cannot be used to extract magnesium from magnesium oxide ($MgO$).

5. Describe the main chemical reactions occurring in a blast furnace during iron extraction, including raw materials used and the formation of slag.

6. A student carries out three displacement experiments by heating metal oxide powders with carbon or passing hydrogen gas over them: Experiment A: Carbon + Zinc Oxide Experiment B: Carbon + Aluminium Oxide Experiment C: Hydrogen Gas + Copper(II) Oxide For each experiment, predict whether a reaction occurs, identify any products formed, and justify your answer based on the Reactivity Series.

7. True or False: Aluminium oxide (bauxite) can be reduced to aluminium metal by heating it with carbon powder in a blast furnace.

8. Write a balanced word equation for the thermal decomposition of calcium carbonate when heated strongly.

9. Which non-metal element is situated between Aluminium and Zinc in the Reactivity Series of Metals?

10. State the chemical names for the following natural minerals: (a) Bauxite, (b) Hematite.