Скачать или смотреть NCERT Class 8 Science Chapter 4: Materials: Metals & Non-Metals | CBSE | English | NSO | Olympiad

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On burning, metals react with oxygen to produce metal oxides which are basic in nature. Non-metals react with oxygen to produce non- metallic oxides which are acidic in nature.
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Metals react with acids and produce metal salts and hydrogen gas. Generally, non-metals do not react with acids.
Some metals react with bases to produce hydrogen gas.
More reactive metals displace less reactive metals from their compounds in aqueous solutions.

Caesium is considered to be the softest metal and Lead is considered one of the softest metals. Mercury at room temperature is liquid (molten). Gallium is liquid at body temperature, while solid (if soft) at room temperature.
Tungsten is hardest metal and has the highest tensile strength, but it is brittle and appears to break down on contact.

Non-metal is essential for our life which all living beings inhale during breathing,
Non-metals used in fertilisers to enhance the growth of plants,
Non-metal used in water purification process,
Non-metal used in the purple coloured solution which is applied on wounds as an antiseptic,
Non-metals used in crackers.

Chapters:
0:00 NCERT Class 8 Science Chapter 4 Materials: Metals & Non-Metals
0:24 Alkali and Alkali Earth
1:58 Metals and Properties
8:07 Rusting of Iron
13:24 Reactivity Series
16:14 Non-metals and Properties
19:48 Oxides of Non-Metals
21:02 Metalloids
22:14 Properties of Metals Vs Non-Metals
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