
Metals and Non-metals 3.1 PHYSICAL PROPERTIES 3.1.1 Metals The easiest way to start grouping substances is by comparing their physical properties 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 sand paper and note their appearance again. After rubbing with sand paper metal is shining. Metals, in their pure state, have a shining surface. This property is called metallic lustre. Activity 3.2 · Take small pieces of iron, copper, aluminium, and magnesium. · Try to cut these metals with a sharp knife and note your observations. · Hold a piece of sodium metal with a pair of tongs. CAUTION: Always handle sodium metal with care. Dry it by pres...
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