1. Complete Activity 3.1 (Page 37).
- Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample.
- Clean the surface of each sample by rubbing them with sand paper and note their appearance again.
Answer:
Aim: To note the appearance of samples of iron, copper, aluminium and magnesium, clean the surface of eachby rubbing with sandpaper and note the appearance again and conclude.
Materials Required: Samples of iron, copper, aluminium and magnesium, sandpaper.
Procedure:
(i) Study the appearance of iron, copper, aluminium and magnesium.
(ii) Rub the metals with sandpaper and study the appearance again. Make a note of the observations.
Observations:
(i) Initially the metals appear shiny.
(ii) On rubbing with sandpaper the metals appear shinier.
Conclusions:
Metals, in their pure state, have a shiny surface. This property is called metallic lustre.
“Complete Activity 3.1 (Page 37).
Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample.
Clean the surface of each sample by rubbing them with sand paper and note their appearance again.” – Solved.
Related Links:
Solution to Activity 3.1
Solution to Activity 3.2
Solution to Activity 3.3
Solution to Activity 3.4
Solution to Activity 3.5
Solution to Activity 3.6
Solution to Activity 3.7
Solution to Activity 3.8
Solution to Activity 3.9
Solution to Activity 3.10
Solution to Activity 3.11
Solution to Activity 3.12
Solution to Activity 3.13
Solution to Activity 3.14
