chemical compounds also known as electrolysis. Therefore leaving us sodium‚ chlorine gas‚ hydrogen gas and oxygen gas. If you are wondering where I got this from here’s how: Salt is NaCl which is Sodium Chloride separate that and you get sodium and chlorine gas. Water is H20 which is Dihydrogen Monoxide (2 part hydrogen and one part oxygen) sepaprate that and you get hydrogen gas and oxygen gas. Anyway‚ hydrogen gas and sodium are both positive ions (atoms)‚ because opposites attract both of the
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Independent: % catalyze concentration ( Dependent: rate of reaction (mm/s) Materials: Mortar and pestle Graduated cylinder Distilled water Test tubes Chicken liver (or any other liver) Sterile transfer pipet (Dropper) Sterile weigh boat Hydrogen peroxide Razor blade Cutting board Electronic balance Timer Ruler Clean everything Calculate mass of chicken liver needed for 1ml‚ 5ml‚ 10ml‚ 15ml‚ and 20ml catalyzes concentration mass to volume concentrations. In other words: 1% =
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Student Number Mark / 39 Chemistry Preliminary Course Final Examination • 2006 General Instructions • • • • • • • Reading time – 5 minutes Working time – 45 minutes Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A Data Sheet and a Periodic Table are provided Write your Student Number at the top of this page Total Marks – 39 Part A – 10 marks • Attempt Questions 1 – 10 • Allow about 10 minutes for this part Part B – 29 marks • Attempt
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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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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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