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P-block elements (Properties of Boron)
The document provides detailed information about the chemical properties and uses of boron and its compounds, including borax, boric acid, and diborane. Key characteristics such as atomic number, melting point, boiling point, and various applications in industries are highlighted. It also raises questions about the acid characteristics and behavior of boron compounds.
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P-block elements (Properties of Boron)
- 1. UNIT - 11 Thep-BLOCK Elements
- 2. Atomic Number –5 Melting point – 2365 K Atomic Weight – 10.811 Boiling point – 4275 K Electronic Configuration – 1s2 2s2 2p1 Electronegativity – 2.04 Ionization Potential – 8.298 eV Series – Metalloid 2 Isotopes – State – Solid Atomic Radius – 0.98 Å Density – 2.34 gm.cm-3 Covalent Radius – 0.82 Å 11B(80.1) ,10B (19.9%)
- 3. Most of thechemistry of boron compounds is based on the lack of an octet of electrons about the central boron atom. These compounds are electrondeficient; the deficiency causes them to exhibit some unusual bonding features. Some useful compounds of Boron Borax (Na2Ba4O7.10H2O) Borax, a hydrated borate, is the primary source of boron. Orthoboric Acid (H3BO3) Diborane (B2H6)
- 4. Chemistry Of Boron Elementalboron is rare and poorly studied because the material is extremely difficult to prepare. Most studies on boron involve samples that contain small amounts of carbon. Crystalline boron is chemically inert and resistant to attack by boiling hydrofluoric or hydrochloric acid. The rate of oxidation of boron depends upon the crystallinity, particle size, purity and temperature. Boron does not react with air at room temperature, but at higher temperatures it burns to form boron trioxide.
- 5. Na2B4O7 .10H2O Borax is animportant boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water.
- 6. USES Ingredient in enamelglazes Component of glass, pottery, and ceramics Borax can be used as an additive in ceramic slips and glazes to improve fit on wet, greenware, and bisque. For stopping car radiator and engine block leaks
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- 8. USES OF BORICACID Boric acid can be used as an antiseptic for minor burns or cuts. Boric acid was first registered in the US as an insecticide in 1948 for control of many insects. Boric acid is used in the production of the glass in LCD flat panel displays. Boron is used in pyrotechnics to prevent the amide-forming reaction between aluminum and nitrates.
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- 10. USES OF DIBORANE Diboraneis a powerfull reducing agent in organic synthesis. Diborane is largely used in semiconductor manufacturing. Diborane is also used for the production of borophosphosilicate glasses. It is also used to coat the walls of tokamaks to reduce the amount of heavy metal impurities in the plasma.
- 11. USES OF BORONAND ALUMINIUM AND THEIR COMPOUNDS Aluminium BORON making bullet-proof vests. Transportation industry It is used in nuclear industry, as protective shields and control rods. Packaging Construction In electronics and CDs(highly pure aluminium is used) Heat sinks for electronic appliances. Manufacturing heat resistant glasses, fibreglass, glass wool etc. Used as a mild antiseptic.
- 12. Questions Why is boricacid considered a weak acid? Why does boron trifluoride behave as a Lewis acid? Is boric acid a protic acid ? Why ? On heating boric acid, what new compound will be formed? Which compound of boron will be formed on further heating?
- 13. Group Aman Kumawat NeilBhushan Bosco Chiramel Rishabh Dev Chawla