Activity 3.1 Class 10 Science

This activity explains the metallic lustre  the specific characteristics of metals.

 

Aim of the activity

To observe the colour and surface appearance of different

Materials Required

   1. Samples of four metals – iron , copper , aluminium  and magnesium

    2. Sandpaper

 

Procedure

 

We take sample pieces of four metals – iron, copper, aluminium and magnesium and place them on a table and observe their surface appearance.

 

After that, we rub each sample with sandpaper and observe the surface appearance again.

Observation

Metal	Initial appearance	Appearance after rubbing
Iron	Dull rusty	Shiny grey
Copper	Dull Reddish brown	Reddish shiny
Aluminium	Dull silvery white	Shiny silvery
Magnesium	Dull greyish	Shiny silver

 

Explanation

Metal surface appear dull because their surface gets covered with layer of dust of oxide and this hides the natural shine or lustre of the metal.

 When we rub the metal surface, this layer is removed and shiny surface appears.

Conclusion

This activity explains the metallic lustre which is a physical property of metals.

Frequently Asked Questions

   1.  What property of metals is discussed in this activity?

Answer – Metallic lustre

   2. Is the oxide layer harmful to the metal?

Answer – No, it is not harmful instead it protect the metal from further corrosion.

    3. What is metallic lustre?

Answer- Metallic lustre is the natural shine or brightness on metal surface.