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Questions and Answers
What is the primary benefit of anodising aluminium?
What is the primary benefit of anodising aluminium?
- It improves thermal conductivity.
- It creates a thick oxide layer for corrosion resistance. (correct)
- It increases its electrical conductivity.
- It makes aluminium lightweight.
Why are reactive metals like sodium and potassium stored in kerosene oil?
Why are reactive metals like sodium and potassium stored in kerosene oil?
- To enhance their conductivity.
- To maintain their temperature.
- To prevent them from reacting with moisture in the air.
- To protect them from oxidation and potential fires. (correct)
Which of the following metals does not react with oxygen even at high temperatures?
Which of the following metals does not react with oxygen even at high temperatures?
- Aluminium
- Silver (correct)
- Zinc
- Copper
What happens during the anodising process of aluminium?
What happens during the anodising process of aluminium?
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What observable property distinguishes sodium from magnesium in terms of reactivity?
What observable property distinguishes sodium from magnesium in terms of reactivity?
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Study Notes
Anodising
- Anodising creates a thick oxide layer on aluminium, enhancing its resistance to corrosion.
- Aluminium naturally develops a thin oxide layer when exposed to air, which protects against further damage.
- The anodising process involves electrolysis of a clean aluminium article with dilute sulphuric acid, where it serves as the anode.
- Oxygen gas produced at the anode reacts with aluminium, promoting the formation of a thicker protective oxide layer.
- The resulting oxide layer can be easily dyed, providing aesthetically pleasing finishes for aluminium products.
Metals Reacting with Oxygen
- Reactive metals like potassium and sodium ignite when exposed to air; they are thus stored in kerosene oil to prevent fires.
- Common metals (e.g., magnesium, aluminium, zinc, lead) develop a protective oxide layer that shields them from further oxidation at normal temperatures.
- Iron remains stable when heated, but iron filings burn fiercely in flames, illustrating differences in reactivity.
- Copper does not combust but forms a black layer of copper(II) oxide when heated.
- Precious metals like silver and gold are inert to oxygen even under high temperatures.
- Sodium is identified as the most reactive metal, followed by magnesium, which shows less vigorous reactions.
- Observations indicate that reactivity among metals such as zinc, iron, copper, and lead requires further investigation to establish a precise order.
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