April-May ranges from 36~42°C arid mean minimum temperature during winter ranges from 15-24° centigrade. Semi-arid to sub-humid‚ tropical to sub-tropical monsoon type climate with alternate dry and wet periods and calcification (formation of calcium carbonate) are favourable to the formation of black soils. The soils are characterised by dark grey to black colour with 35-60% clay‚ neutral to slightly alkaline reaction‚ high swelling and shrinkage‚ plasticity‚ deep cracks during summer and poor status
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Brian Jones Melanie Raite Biology 1103 November 3‚ 2012 DDT and Its Effects on Peregrine Falcons The Peregrine Falcon (Falco peregrinus)‚ or Duck Hawk‚ is a medium-sized raptor weighing 2 to 2 ½ pounds. These remarkable birds of prey measure 15-21 inches and have a wingspan of about 3 ½ feet. Their name‚ Peregrine‚ comes from the Latin word peregrinus‚ which means “to wander”. The name fits‚ given that they have one of the longest migrations in North America and are found on every continent
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except; PbCl2 - lead(II) chloride (dissolve in hot water) AgCl - argentums/silver chloride HgCl - hydroargentum chloride‚ mercury chloride Sulphate All sulphate salt dissolve in water except; PbSO4 ‚ BaSO4 ‚ CaSO4 Carbonate All carbonate salt not dissolve in water except; Li2CO3 Na2CO3 ‚ K2CO3 ‚ (NH4)2CO3 Oxide All oxide not dissolve in water except; Na2O ‚ K2O ‚ CaO Hydroxide All hydroxide not dissolve in water except; NaOH‚ KOH‚ Ca(OH)2 ‚ Ba(OH)2 Formula to
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water and then with the alkali. Rinse with tap water and then with distilled water. Rinse with tap water and then with the acid. Rinse with the alkali. The labels fell off two bottles each containing a colourless solution‚ one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? A B C D ammonia hydrochloric acid lead(II) nitrate sodium hydroxide
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by reacting sodium hydroxide with impure potassium. Potassium hydroxide is usually sold as translucent pellets‚ which will become tacky in air because KOH is hygroscopic. Consequently‚ KOH typically contains varying amounts of water (as well as carbonates; see below). Its dissolution in water is strongly exothermic‚ meaning the process gives off significant heat. Concentrated aqueous solutions are sometimes called potassium lyes. Even at high temperatures‚ solid KOH does not dehydrate readily. Other
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in accordance with Edexcel Limited copyright policy. ©2011 Edexcel Limited. Printer’s Log. No. Turn over N36637A W850/U7081/57570 5/5/5/ *N36637A0120* Leave blank Answer ALL the questions. 1. Complete the table. Name of compound calcium bromide NH4NO3 sodium sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound 2 *N36637A0220* Leave blank 2. Complete the following statements by inserting the missing colours. (a) When water is added
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bills will be high because your water pipe has a leak. These are just some of the problems we encounter in our houses‚Primary cure to this problems are sealants.Oyster isn’t just any seafood its shells has avery useful usage.Oyster shells has a calcium carbonate and silicate;the shells also contains many other ingredients including Aspartic acid‚Glycine‚Serine and a whole lot more.Sealants can also be made out of oyster shells‚sealants are viscous material that has little or no flow charecteristics and
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Describe how the presence of substances in the table above: copper(II) sulfate‚ iron(II) sulfate and cobalt(II) chloride) change rate of the reaction. Unit 2 learning Aim C – How fast is your reaction? – Part 4 Chemical equation calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water CaCO3(s)
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found in the laboratory are hydrochloric acid‚ sulphuric acid and nitric acid. 3. Alkalis taste bitter and feel soapy or slippery. 4. The common alkalis found in the laboratory are sodium hydroxide solution‚ potassium hydroxide solution‚ calcium hydroxide solution and ammonia solution. 10.2 Acid-Alkali Indicators 1. An acid-alkali indicator shows different colours in acids and alkalis. It can be used to test acids and alkalis. 2. Natural indicators can be made from some deeply coloured
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Design Lab #17: Reaction Rate - Calcium Carbonate & Hydrochloric acid Design D: Introduction: In this experiment calcium carbonate will be put into a flask and mixed with hydrochloric acid to produce calcium chloride‚ water and carbon dioxide. The formula for this reaction is: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) Purpose: The purpose of this experiment is to determine how the surface area of CaCO3(s) affects the rate of
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