Here you will find NCERT Activity 3.1 Class 10 Science Explanation that belongs to Chapter 3 Metals and Non-metals. After reading Solutions of Chapter 3 Metals and Non-metals, you will be able to understand activity 3.1.
NCERT Activity 3.1 Class 10 Science Explanation
Activity 3.1
Take samples of iron, copper aluminium, and magnesium. Note the appearance of each sample.
Clean the surface of each sample by rubbing them with sandpaper and note their appearance again.
Observations activity 3.1
The surface of the metals is dull because they are covered with a layer of oxide, hydroxide, carbonate, etc. due to the reaction of gases present in the air. When the surface is rubbed with sandpaper, the layer removes and a shiny surface appears.
Conclusion activity 3.1
Metals
in the pure state have a shining surface. This property is called metallic
luster.
Metallic luster-
Luster means to shine
or brightness. Generally, all metals have a shining surface. We come across a
variety of metals in our day to day to life.
When light falls on
the surface of a metal, the atoms absorb photons and they get excited and start
vibrating. The vibrating electrons release energy as light so the metal surface shines.
The surface of aluminum becomes dull
after the formation of a coating of aluminium oxide.
Related Topics -
1. Activity 3.2
2. Solution of Chapter 3 Metals and Non-metals
4. Extra Questions of Chapter 3
5. Solutions of Class 10 Science all chapters
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