Experiment 7 Gooch filter crucible or fritted-glass funnel Mother liquor- liquid from which a substance precipitates or crystallizes Filtrate- liquid that passes through the filter Slurry- suspension of solid in liquid Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O The precipitate is soluble in acidic solution because the oxalate anion is a weak base CaC2O4.H2O (calcium oxalate monohydrate ; MW = 146 g/mol) Equation: Ca2+(aq) + C2O42-(aq)
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1. (a) The diagram below represents the industrial fractional distillation of crude oil. (i) Identify fraction A. (ii) What property of the fractions allows them to be separated in the column? (2) (b) A gas oil fraction from the distillation of crude oil contains hydrocarbons in the C15 to C19 range. These hydrocarbons can be cracked by strong heating. (i) Write the molecular formula for the alkane with 19 carbon atoms. (ii) Name the type of reaction involved in cracking. (iii) Write
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Abstract: The fully propagated real time-dependent density functional theory method have been applied to study the laser--molecule interaction in 5- and 6-benzyluracil (5BU and 6BU). Different parameters like direction‚ strength‚ wavelength of the laser field have been chosen in order to obtain the most efficient excitation of molecules. Results show that the 5BU and 6BU molecular systems have different responds to the applied laser field and different‚ well defined laser field parameters can be
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Lab: Flame Test Purpose: to determine the ID of 2 unknown substances Background Information: Every atom consists of a nucleus with tiny electrons whizzing around it. The further away from the nucleus they are‚ the more energy the electrons have. If a metal atom is heated‚ the electrons get enough energy to jump higher away from the nucleus‚ they become “excited”. When they fall back closer to the nucleus (back to their ground state)‚ they give off this extra energy as light. Why is the
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4. (a) Place asterisks at all of the asymmetric carbon atoms in the molecule shown below (prostacyclin). (b) Based on the number of asymmetric carbons‚ how many stereoisomers of prostacyclin are possible? 5. Hydrogenation of an alkene will yield an alkane. The alkane formed by hydrogenation of (S)-4-methyl-1-hexene (I) is optically active‚ while the one formed by hydrogenation of (S)-3-methyl-1-pentene (II) is not. Explain. I II 6. Draw
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shows IR absorption at about 3300 cm-1. When treated with excess hydrogen and a nickel catalyst‚ X yields 2-methylpentane. The most likely structure for X is: A) B) C) D) E) Ans: D 243 Keghan Chapter 8 Topic: Structure Elucidation 5. An unknown compound‚ A‚ has the molecular formula C7H12. On oxidation with hot aqueous potassium permanganate‚ A yields CH3CH2COOH and (CH3)2CHCOOH. Which of the following structures best represents A? A) B) C) D) E) Ans: C 244 Keghan
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it had a high melting point but also low solubility in water. I think substance 3 is an ionic compound because it had a high melting point and solubility in water. Substance 4 may be a metallic compound because it has a low melting point. Substance 5 might be an
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Question 1 Electromagnetic radiation behaves both as particles (called photons) and as waves. Wavelength () and frequency () are related according to the equation where is the speed of light (). The energy ( in joules) contained in one quantum of electromagnetic radiation is described by the equation where is Planck’s constant (). Note that frequency has units of inverse seconds ()‚ which are more commonly expressed as hertz (). Part A A microwave oven operates at 2.40 . What is the wavelength
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as being more relatable at a human level‚ as opposed to an epic tale. Though‚ may I might add‚ the tale is still epic in a timeless sense‚ ‘Spearesy’ uses small-scale settings and conversations to say a thing or two about morality and its effect on life and lives. “ ‘Murder most foul‚ as in the best it is; but this most foul‚ strange’‚ ‘Haste me to know’t‚ that I‚ with wings as swift As meditation or the thoughts of love‚ May sweep to my revenge’ “. Now‚ Spearesy stays true to the conventional
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(proton)‚ and a base is a species with the ability to gain or "accept" a hydrogen ion (proton). acid salt: NaHSO4 & H2O => Na+ & H3O+ & SO4-2 basic salt: Na2CO3 & H2O => 2Na+ & (HCO3)-1 & OH- neutral salt: NaCl & H2O => Na+ & Cl- & H2O Module 5- Buffers 15. An acid contributes a surplus of hydrogen ions to a solution. A base contributes a surplus of hydroxide (OH) ions to a solution. 16. Buffer solutions are solutions that resist change in Hydronium ion and the hydroxide ion concentration
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