of benzene; predict the directive influence of substituents in monosubstituted benzene ring; learn about carcinogenicity and toxicity. • • • • • • • The term ‘hydrocarbon’ is self-explanatory which means compounds of carbon and hydrogen only. Hydrocarbons play a key role in our daily life. You must be familiar with the terms ‘LPG’ and ‘CNG’ used as fuels. LPG is the abbreviated form of liquified petroleum gas whereas CNG stands for compressed natural gas. Another term ‘LNG’ (liquified
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test tube rack and add about 5mL of HCl. Carefully drop a piece of zinc metal and observe briefly. Quickly cover the test tube with a cork and after a minute‚ insert a lighted match on the mouth of the test tube. A “Pop” indicates the presence of hydrogen. Pour 5mL of CuSO4 in a clean test tube and add a piece of zinc metal. Let it stand in the rack for five minutes. Pour 5mL of CuSO4 in another test tube. Using a pipette‚ transfer the solution of the first test tube into another clean one. Observe
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5 Question 8 In water‚ hydrogen bonding occurs between the hydrogen and Answer a hydrogen atom in a different molecule. Comments The correct answer is: an oxygen atom in a different molecule. Max Score: 5 Actual Score: 0 Question 9 Covalent bonds form when one atom _________ its _________ with another atom. Answer shares; electrons Comments Correct!! Max Score: 5 Actual Score: 5 Question 10 Water is an important solvent of life because Answer it forms hydrogen bonds. Comments Correct!!
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acidic (pKa ~ 20) α-hydrogen of the ketone. This acidity is due to the stability of the resonance structures of the corresponding enolate ion that forms upon dissociation. When the hydroxide is able to subtract a hydrogen atom‚ a carbanion is formed. This carbanion is a very strong base and is able to attack the chlorine thus taking one of the chlorine atoms. The introduction of one chlorine atom catalyzes the attack of another hydroxide molecule on the remaining α-hydrogens of the ketone. The subsequent
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V. HAZADOUS WASTE TREATMENT PROCESS Presently‚ the hazardous waste treatment technologies are highly developed from the decade before due to the more environmental and ecosystem concerning. Moreover‚ hazardous waste not threaten only environment but also to human hygiene and health. However‚ one of the most dangerous hazardous waste is dichlorodiphenyltrichloroethane (DDT). Addition‚ DDT is used as a majority pesticide during agriculture revolution period‚ and also uses to regulate Malaria in developing
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similar number of carbon atoms and physical properties. The uses of the fractions depend on their physical and chemical properties. www.igcse.at.ua Hydrocarbon molecules are only made of a chemical combination of carbon and hydrogen atoms. They are compounds because they consist of atoms of atleast two different elements. THE FRACTIONAL DISTILLATION OF CRUDE OIL www.igcse.at.ua Crude oil is a complex mixture of mainly hydrocarbon compound molecules
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interactions between the toxin and antimicrobial peptide and a global energy -43.23 kcal/mol. The N of Gly22‚ OG1 of Thr42 and OD1 of Asn69 of Diphtheria toxin form conventional hydrogen bonds with O of Ala6‚ O of MSE1 and N of MSE1 respectively of Microcin C7. The CE1 of His21 and CA of Ala62 of Diphtheria toxin form carbon hydrogen bond with O of Asn5 and O of Asn7 respectively of Microcin C7. Tyr65 of Diphtheria toxin forms electrostatic non bond with OXT of Asn7 of Microcin C7. The Pi-orbitals of His
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total number of atoms contained in 2.00 moles of nickel? A) 118 C) 58.9 C) 1 liter of neon D) 1 gram of neon 3) 4) What quantity is represented by the symbol Ne? A) 1 mole of neon B) 1 atomic mass unit of neon 5) How many moles of hydrogen atoms are present in one mole of C2H4(OH)2? A) 6 B) 2 C) 8 D) 4 What is the mass of 3.0 x 1023 atoms of neon? A) 10. g B) 1.0 g C) 20. g D) 0.50 g A sample of nitrogen containing 1.5 x 1023 molecules has the same number of molecules as a sample containing
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Yet‚ this behavior does not correspond to Kekule’s structural formula‚ which says that three conjugated double bound should exist. Another critic brought to this formula is that she predicts the existence of for isomers than in reality. If two hydrogen atoms in the benzene’s molecule are substituted with two bromine atoms‚ then‚ according tot Kekule’s rule‚ there should be two isomers containing two bromine atoms connected to two nearby carbon atoms (positions 1‚2 and 1‚6) at one
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Experimenting with a Candle Justin Nguyen Mrs. Howley 11/16/11 Mod F Purpose: the purpose is to learn how the process of a candle burning. The goals of this experiment are to practice in the art of observation‚ the art of questioning‚ and the development of a better understanding of this process. Hypothesis: through this experiment‚ we will learn how candle is working. Materials: * Candle * Note card * Matches or butane lighter * Aluminum foil * 1L beaker * Balance
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