Alkaline soil is referred to by some gardeners as”sweet soil”. The pH level of alkaline soil is above 7‚ and it usually contains a great deal of sodium‚calcium and magnesium. (1) Alkaline soil occurs in areas with high limestone content‚ easy souble phosphorus and calcium binding‚ formation of insouble calcium salts of phosphorus‚ reducing the effectiveness of phosphorus. Also‚ in calcareous soils‚ boron‚ manganese‚ molydenum‚ zinc‚ iron greatly reduces the effectiveness of the crop often feel inadequate
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If you are looking for instructions about building a lemon battery to light an LED‚ see Lemon Battery at Wikibooks. The lemon battery is a simple type of electrical battery that is commonly made for school science projects because it illustrates a battery’s main components. Typically‚ a piece of zinc metal and a piece of copper metal are inserted into a lemon. Everyday objects such as galvanized nails and copper pennies can be used for the zinc and for the copper. A single lemon is usually studied
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(Fe3+ ) form. Ferric form is not usually absorbed in the body. In the stomach‚ there is low pH of 2 due to presence of gastric acids such as Hydrochloric and Ascorbic acids. These acids provide an acidic environment for reduction of ferric iron to ferrous (Fe2+). Ferrous iron can be absorbed in the body system. As in following equation of iron (iii) reaction with Ascorbic acid ‚ the product is iron (ii) chloride which is soluble 2 Fe3+ (s) + C6 H8 O6 (aq) → 2 Fe2+ (aq) + C6 H6 O6 (aq) + 2 H (aq)+
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Flame resistance is the characteristic of a fabric that causes it not to burn in air. Flame resistance is often confused with flame retardant which is a term used to describe a chemical substance that imparts flame resistance on fabric. The most commonly used test method for measuring flame resistant (FR) fabrics is ASTM D6413* Standard Test Method for Flame Resistance of Textiles (Vertical Test) (formerly; Method 5903.1 of Federal Test Method Standard 191A). The test uses an enclosed cabinet in
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question(s). pKas of Some Phenols Y pKa H 9.89 m-NO2 8.28 p-NO2 7.17 m-OCH3 9.65 p-OCH3 10.21 14. Refer to Exhibit 17-2. The weakest acid in the table is: ANS: p-methoxyphenol 15. Refer to Exhibit 17-2. Which of the acids in the Table has the weakest conjugate base? ANS: p-nitrophenol 16. Refer to Exhibit 17-2. How do you account for the difference in acidity between meta and para-nitrophenol? ANS: In m-nitrophenol
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reactions to remember: Acid reactions: acid + base salt + water acid + metal salt + hydrogen gas acid + carbonate carbon dioxide gas + salt + water Formation of hydronium: H+ + H2O H3O+ Reactions of various oxides with water: Non-metal (acidic) oxides: CO2 (g) + H2O (l) H2CO3 (aq) (carbonic acid) SO2 (g) + H2O (l) H2SO3 (aq) (sulfurous acid) 2NO2 (g) + H2O (l) HNO3 (aq) + HNO2 (aq) (nitric and nitrous acid) P2O5 (g) + H2O (l) 2H3PO4 (aq) (phosphoric acid) Metal (basic) oxides:
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ETHERS Classification of Ethers: Symmetrical ethers – two groups attached to O are identical Ex. CH3CH2OCH2CH3 – diethyl ether Unsymmetrical ethers – two groups attached to O are not identical Ex. CH3CH2OCH3 – ethyl methyl ether Physical Properties of Ethers: Ethers have much lower boiling points compared to alcohols of comparable MWs. BPs of ethers increases with increasing MW. BPs of isomeric ethers increase with increasing alkyl chain length. BPs of ethers are about the
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AP Chem Exam - ‘98 1. Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. (a) The solubility of Cu(OH)2(s) is 1.72 x10–6 g/100. mL of solution at 25° C. (i) Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution. Cu(OH)2 Cu 2+ + 2 OH – (ii) Calculate the solubility (in mol/L) of Cu(OH)2 at 25 °C. (1.72 x10–6 g/0.100 L)(1 mol/97.5 g) = 1.76 x10–7 mol/L (iii) Calculate
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analysts forecast the Global Lead Acid Battery market to grow at a CAGR of 3.5 percent over the period 2013-2018. One of the key factors contributing to this market growth is the development of AGM lead-acid batteries. The Global Lead Acid Battery market has also been witnessing an increase in the power deficit. However‚ the possibility of explosion could pose a challenge to the growth of this market. To Get More Details : http://www.bigmarketresearch.com/global-lead-acid-battery-2014-2018-market
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of the Wittig reaction is not complex. Phosphorus is a second row element - in-group 5 - like nitrogen‚ but unlike nitrogen‚ has the ability to expand its valencey from 3 to 4‚ 5‚ or even 6 (1). The stable 5 valencies are met in compounds like phosphoric acid and PCL (1). Wittig discovered that phosphines‚ which are the phosphorus equivalent of amines‚ easily form phosphonium salts with alkyl halides and that these salts readily lose HX with strong base. This product is called an ylide or a phosphorane
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