Chemistry Metal & Non-Metal Part 8 (Metal reaction with oxygen) Class 8 VIII | Summary and Q&A

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November 7, 2015
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Chemistry Metal & Non-Metal Part 8 (Metal reaction with oxygen) Class 8 VIII

TL;DR

Metals react with oxygen to form metal oxides, such as magnesium oxide and copper oxide. Rusting occurs when iron and copper react with oxygen and water, forming iron hydroxide and copper hydroxide respectively. Metal oxides are basic in nature.

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Questions & Answers

Q: How do metals react with oxygen?

Metals combine with oxygen to form metal oxides. Examples include magnesium reacting with oxygen to form magnesium oxide and copper reacting with oxygen to form copper oxide.

Q: How does rusting occur?

Rusting occurs when iron or copper comes in contact with oxygen and water. In the presence of moisture, iron reacts with oxygen to form iron hydroxide, while copper reacts with oxygen and carbon dioxide to form copper hydroxide.

Q: Are metal oxides acidic or basic?

Metal oxides are basic in nature. This can be determined through the litmus test, where the litmus paper will turn blue when dipped into a solution of metal oxide.

Q: How can rusting be prevented?

Rusting can be prevented by applying a protective layer of another metal, such as zinc or chromium, on top of iron. This prevents iron from coming into contact with oxygen and water.

Summary & Key Takeaways

  • Metals react with oxygen present in the air to form metal oxides, such as magnesium oxide and copper oxide.

  • Rusting occurs when iron reacts with oxygen and water, forming iron hydroxide. Copper also undergoes rusting, forming copper hydroxide.

  • Metal oxides are all basic in nature, as determined through the litmus test.

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