Podcast
Questions and Answers
Which metals react vigorously with oxygen and can catch fire?
Which metals react vigorously with oxygen and can catch fire?
- Copper and Silver
- Potassium and Sodium (correct)
- Aluminium and Zinc
- Lead and Magnesium
What prevents further oxidation of metals such as magnesium and aluminium at ordinary temperature?
What prevents further oxidation of metals such as magnesium and aluminium at ordinary temperature?
- High temperature
- Thick corrosion layer
- Thin oxide layer (correct)
- Immersion in water
What happens to copper when it is heated in the presence of oxygen?
What happens to copper when it is heated in the presence of oxygen?
- It turns into a white powder
- It reacts violently with water
- It is coated with copper(II) oxide (correct)
- It catches fire spontaneously
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?
Why are potassium and sodium metals stored in kerosene oil?
Why are potassium and sodium metals stored in kerosene oil?
Study Notes
Reactivity of Metals with Oxygen
- Metals exhibit varying reactivities towards oxygen; not all react at the same rate.
- Potassium and sodium react vigorously with oxygen, often igniting spontaneously in the air.
- To mitigate the risk of fires, potassium and sodium are stored submerged in kerosene oil.
- At room temperature, metals like magnesium, aluminum, zinc, and lead develop a protective oxide layer that prevents further oxidation.
- Iron remains stable under heat and doesn't burn, but fine iron filings ignite easily when exposed to a flame.
- Copper does not combust but forms a black layer of copper(II) oxide when heated.
- Precious metals such as silver and gold do not react with oxygen, even at elevated temperatures.
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Description
This quiz explores the varying reactivity of different metals with oxygen. Understand why certain metals like potassium and sodium react vigorously, while others show different behaviors. Test your knowledge on factors influencing metal reactivity and safety precautions needed for certain metals.
