8 16 (-2‚-1‚-1/2 Strontium(Sr) 38 88 (+2) Sulphur(S) 16 32 (2‚4‚6) Barium(Ba) 56 137 (+2) Selenium(Se) 34 79 (-2) Radium(Ra) 88 226 (+2) Tellurium(Te) 52 127.6 (-2) `Boron(B) 5 11 (+3‚-5} Flourine(F) 9 19 (-1) Aluminium(Al) 13 27 (+3) Chlorine(Cl) 17 35 (-1) Gallium(Ga) 31 70 (-3) Bromine(Br) 35 80 (-1) Indium(In) 49 115 (-3) Iodine(I) 53 127 (-1) Thallium(Tl) 81 205 (-3) Astatine(At) 85 210 (-1) Carbon© 6 12 (+4) Some More
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d. Uses of ammonia e. The properties of ammonia f. Manufacture of ammonia g. Preparation of ammonium fertilisers 3) Alloys------------------------------------------------------------------------(11-14) h. Arrangement of atom in metals i. What are alloys? j. The arrangement of atoms in alloys 4) Synthetic Polymers------------------------------------------------------(15-17) k. What are polymers? l. Monomers in synthetic polymers
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periodic table‚ known as the boron group elements. It is represented by the chemical symbol Al‚ and has an atomic number of 13. Aluminum‚ also spelt Aluminium‚ comes from the word alum‚ KAl(SO4)2.12H2O‚ which is potassium aluminum sulfate. This salt was used in Roman times in dyes and medicinal purposes. The metal was called aluminium with the -ium ending being the accepted ending for most elements at that time. This usage persists in most of the world except the United States‚ where the
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huts‚ tooth or bone leather tents‚ most near lakes and rivers so that they can only made use of natural material. Later in Bronze Age‚ humans started to gather and developed their own villages. They used copper and tin‚ lead‚ arsenic or antimony alloy produced tools and weapons. Ever since the production of bronze productivity of agriculture and handicrafts were improved‚ material living conditions are getting better. Iron contains high amount of hardness‚ high melting point‚ making it relatively
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Principles of Engineering Design Coursework Report: Design of a Bicycle Frame Introduction Bicycles‚ whether they be mountain bikes or just ordinary street cycles‚ play an important role in society‚ especially in sport and in general means of transportation. The history of bicycles and their contribution to an economical means of transportation goes as far back as the 19th century. Bicycles have progressed and evolved ever since and ever improving with the introduction of spoked wheels‚ a chain
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+ O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to oxidize (such as iron‚ copper‚ zinc‚ nickel). Others‚ like palladium‚ platinum and gold‚ do not react with the atmosphere at all. Some metals form a barrier layer of oxide on their surface which cannot be penetrated by further oxygen molecules and thus retain their shiny appearance and good conductivity for many decades (like aluminium‚ some steels‚ and titanium). The oxides of metals are
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INTRODUCTION Post independence‚ steel industry in India came under the regulatory framework of Government of India‚ which stipulated that steel industry be reserved under the public sector. It also stipulated that capacity creation and enhancement would require licensing‚ and that pricing and distribution of steel would be subject to govt. control. Nationalization of TISCO‚ that existed from before independence could not be carried out due to popular pressure[3]. Economic reforms were started
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *6145201818* CHEMISTRY Paper 3 (Extended) Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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(∆K)m1-RKc-∆K ‚ where B and n are constants for a given material 8. Roberts and Erdogan also examined the problem of mean stress on cracking under cyclic loading and amended the equation (Paris and Erdogan) : dldN= C(Kmax ∆K2 ) p Based on aluminium alloy‚ where C and p are constants. Note: p=2 for high-strength steel 9. SEM revealed common fracture characteristics under all testing conditions: a. localised areas of cleavage (brittle) are more prevalent as instability was approaching.
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A350-XWB changing the impact of planes Air travel makes transport around the world more efficient. In 2014‚ there were approximately 37.4 million scheduled flights of both passenger and cargo airplanes‚ averaging 102‚465 flights a day. This is an increase of 2.7% compared to 2013 (Gunnar Garfors‚ 2014). To satisfy these demands‚ the airline industry has increased the number of flights but associated with it is that airplanes burn an immense amount of fuel/energy‚ polluting the environment. 2% of
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