Materials: Metals and Non-Metals — Science STD 8 — Question
Gujarat BoardEnglish MediumSTD 8ScienceMaterials: Metals and Non-Metals4 Marks
Question
State five uses of metals and five uses of non$-$metals.
✓
Answer
The five uses of metals are given below:
$1.$ Used for making machinery and heavy equipment. Ex $-$ Iron.
$2.$ Used in making electric wires because it is a good conductor of electricity. Ex $-$ copper
$3.$ Used to make thin foils for packaging medicines, chocolate, and food items. This is because it provides a complete barrier to light, oxygen, moisture, and bacteria.
$4.$ Used in the manufacture of many products such as paints, rubber, cosmetics, pharmaceuticals, plastics, inks, soaps, batteries, textiles and electrical equipment.
$5.$ Mercury is a liquid metal and is used for making thermometers. It is liquid at room temperature and is a very good conductor of heat. The five uses of non-metals are given below:
$1.$ Used for making fire crackers.
$2.$ Oxygen is an essential non$-$metal for life. It helps in maintaining life and is inhaled during breathing.
$3.$ Chlorine is used in water purification process to make drinking water supply germfree. Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules.
$4.$ Iodine is a non$-$metal. It is used to make purple coloured solution which is applied on cuts and wounds as an antiseptic.
$5.$ Nitrogen is also a non$-$metal is used to make fertilizers and explosives.
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