Applications of non-metals and properties of metalloids — lesson. Science State Board, Class 8.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Non-metals	Uses
Diamond	It is another form of carbon used for making jewels, cutting and grinding equipment. Graphite is used for making pencil lead.
Sulphur	It is used for the manufacturing of gun powder and the vulcanization of rubber.
Phosphorous	It is used for making matches, rat poison, etc.
Nitrogen	It is used in the manufacturing of ammonia.
Chlorine	It is used in sterilizing water and used as a bleaching agent.
Hydrogen	It is used as rocket fuel. Hydrogen flame is used in cutting and welding. Used as a reducing agent.

Metalloids:

As we know, metalloids exhibit the properties of metals as well as non-metals.

Example:

Arsenic, antimony, silicon, boron, etc.

Physical properties:

Metalloids are solid at room temperature.
They can form alloys with other metals.
Some metalloids (silicon and germanium) can behave as electrical conductors under specific conditions. Hence, they are called Semiconductors.
Silicon appears lustrous; however, it is not malleable nor ductile (it is brittle, a characteristic of some non-metals).
It is a bad conductor of heat and electricity than metals.
The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic.

Uses:

Silicon is used in electronic devices such as cell phones, calculators, etc.
Boron is used in fireworks for providing green colour and as a fuel for ignition in the rocket.

Reference:

file:///C:/Users/user/Desktop/Books/8th_Science/TN/8th_Std_Term_I_Science_EM.pdf

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6. Applications of non-metals and properties of metalloids