Can you plz Answer the questions of activity 3.1 in ncert textbk of science
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Activity 3.1 asks us to check the appearance of some metals and see changes it after rubbing it with sandpaper.
Observation:
We see these metals look dull.
After rubbing with sandpaper all these materials shine.
Explanation:
Metals like iron, copper, magnesium, sodium are reactive metals. These metals react with oxygen and form their oxide on the outer layer. Metal oxides are dull in colour. As a result, the metal loses its lustrous property.
e.g. Iron forms a brown layer which we call rusting of iron; aluminium forms smoke colour aluminium oxide; copper forms a black and green layer with oxygen and sulphur etc.
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