the preferred product is the more highly substituted‚ and therefore more stable alkene. But the rule is not always obeyed and the anti-Zaitsev (or Hofmann) product can dominate. Alkenes • Nomenclature • Stability • Structure • Reactivity Preparation of Alkenes • Dehydration of alcohols • Dehydrohalogenation of alkyl halides 1‚2 Elimination Reactions • Overview • E1 mechanism • E2 mechanism • Selectivity • Sample questions Problems • More
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Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Tuesday 6 November 2007 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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CH 16 - the name of this functional group class is historically derived from the pleasant aromas associated with many of its constituent compounds discovered in past centuries - although not all aromatic compounds known today share the same distinction (many are in fact‚ odorless or even unpleasant)‚ they are the principle components in such pleasant smelling substances as cinnamon‚ licorice‚ wintergreen‚ clove & vanilla CLASSIFICATION – - also known as arenes‚ many aromatic compounds possess
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Chemistry 2283g Experiment 1 – Alkyl Halides EXPERIMENT 1: Preparation and Reactivity of Alkyl Halides Relevant Sections in the text (Wade‚ 7 ed.) • 6.7 (p. 228) Reactions of alkyl halides • 6.8 – 6.12 (p. 229 – 242) The SN2 reaction: generality‚ factors affecting SN2 reactions‚ substrate reactivity‚ mechanism • 6.13 – 6.14 (p. 243 – 249) The SN1 reaction: mechanism‚ stereochemistry General Concepts The most common of the variety of methods available for preparing alkyl halides is the replacement
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This experiment will test the suggestion that the enthalpy change between a metal and a solution of a salt is related to the relative position of the two metals in the reactivity. Presumably the further apart in the series the bigger the enthalpy change will be. The experiment is as follows‚ 1) Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) 2) Zn(s) + Pb(NO3)2(aq) Zn(NO3)2 (aq) + Pb(s) Both of the solutions will be in 1mol.dm-3 Apparatus: Distilled Water Polystyrene Cup
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d‚D2O =0.022188sec;t d‚Be =2.0124e-3sec;t d‚C 8.772e 3sec 7.5 One‐delayed‐neutron group reactivity equation; lp 1 lp where 0.0065; 0.1sec1 1 lp For lp 0.0sec For lp 0.0001sec For lp 0.001sec Note:In this question examine the figure 7.2 and see that to give a constant period value ‚say 1 sec‚you should give much more reactivity as p.neutron lifet ime increases.And it is strongl recommended that before exam‚study figure 7
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Resiliency Scales for Children and Adolescents A critical review Katie Waghorn West Virginia University March 14‚ 2014 Author’s Note This paper was prepared for COUN 505 taught by Dr. Tina Walsh Introduction Resilience is a complex construct with many definitions. Most frequently‚ resilience can be defined as one’s ability to “bounce back” from an adverse situation. It is “interactive and contextual” (Prince-Embury & Saklofske‚ 2013‚ pg.19). However‚ some believe resiliency
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Introduction: The purpose of this experiment is to determine the reactivity of hydrogen atoms on a carbon chain using free radical chlorination. In this experiment 1-chlorobutane will be chlorinated with the combination of sulfuryl chloride and ABCN as an initiator to produce the chlorine radicals. The combination of 1-chlorobutane and sulfur chloride will produce four dichlorobutane isomers. The isomers produced and their reactivity will be analyzed by the amounts of isomers produced in the product
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Summary of Chapter 11 Material SN2 Reaction Substrate: NO SN2 ON A TERTIARY HALOALKANE!! order of reactivity is as follows: Methyl > 1 > 2 Sterically less hindered substrates have faster rates in SN2 Nucleophile: If the reacting atom is the same in a series‚ nucleophilicity parallels basicity (i.e. -OH > -OCH3 > -OCH2CH3 > H2O) For the halogens in GAS PHASE: F- > Cl- > Br- > IFor the halogens in SOLUTION: I- > Br- > Cl- > F- (due to solvation of nucleophile‚ rendering it inactive) Negatively
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4 Identify the oxidizing and reducing agents in redox equations. Same as figuring 9.1.4 9.3.1 Deduce a reactivity series based on the chemical behaviour of group of oxidizing and reducing agents. A species is more reactive than another if it easily loses it electrons e.g. Zn + Cu2+ → Zn2+ + Cu‚ Zn is more reactive than Cu 9.3.2 Deduce the feasibility of a redox reaction from a given reactivity series. For a redox reaction to
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