LEARNING LOG 2: Observe‚ Connect and Reflect on Your Learning PART III – Symmetry in Crystals The most striking examples of symmetry…are crystals. Herman Weyl Period Focus Image Question Your Observations Complete at the end of Week 5 Image 5 Uvarovite is a gemstone rich in chromium. What are your main observations about uvarovite symmetry from studying the external form? (30 - 40 words) (2 marks) What is your personal favourite gemstone and what is its space group. (up to
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following alkene. (Z)-3-propyl-2-heptene 32 Chemistry S-20 Week 2 Bicyclic Compounds and Bredt’s Rule 1. Draw each of the following bicyclic compounds in a good "perspective" drawing. CH3 CH3 trans-decalin: two chairs CH3 CH3 CH3 norbornane skeleton: CH3 H3C CH3 2. The molecule trans-cyclooctene is known to exist. (It is chiral‚ by the way). Why is the analagous molecule trans-cyclohexene unstable? Far too strained to have a trans-alkene in a six-membered ring
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acids by oxidizing agents such as potassium dichromate in an acidic medium. R–CH2–OH + [O] R–CHO+ [O] RCOOH CH3–CH2–OH + [O] CH3–CHO + [O] CH3COOH 2. From aldehydes: Aldehydes are easily oxidized to corresponding carboxylic acids even by mild oxidizing agents such as Tollen’s Reagent ( Ammonia cal silver nitrates). CH3–CHO+ [O] CH3COOH 3. From alkyl nitriles: Compounds
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Mechanism for Olefin Polymerization Chain Propagation: Cossee-Arlman Mechanism = good basic mechanism. Cossee et al.‚ J. Catal.‚ 1964‚ 3‚ 80 & 99. 1‚2-insertion alkene coordination R [M] R [M] [M] R CH2 C H2 [M] R Green-Rooney Mechanism involving metathesis-like step = totally wrong ! CHP CH2P [M] α-elimination [M] H CHP [M] H PHC H [M] R reductive elimination PH2C [M] R alkene coordination R metathesislike process This Mechanism DOES NOT Occur Proposed by Green‚ Rooney
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Everything you need to know about hydrocarbons INTRODUCTION: organic chemistry Organic chemistry is the chemistry of compounds that contain carbon and hydrogen. The element carbon has a special role in chemistry because it bonds with other carbon atoms to give a vast array of molecules. The varity of molecules is so great that we find organic compounds in many common products we use‚ such as gasoline‚ medicines‚ shampoos‚ plastic bottles‚ and perfumes. The food we eat is composed of different
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Preparation of Esters Introduction Esters are known for their pleasant smells such as perfumes and artificial flavorings in contained labs. They are formed when a carboxylic acid reacts with alcohol and a strong acid such as a catalyst called sulfuric acid (H2SO4) for this lab. The structural formula for esters can be represented as R-COO-R’. The R and R’ symbolizes different alkyl groups that can be combined to the ester. When naming an ester the first part comes from the alcohol followed
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is the strongest? (a) (b) (c) (d) 5) Which of the following is vinyl halide? (a) CH2CL2 (b) CH2= CH-Cl (c) CH = C-Cl (d) 6) What is B in R-OH + PX5 R-X +B+ HX? (a) HPOX3 (b) H3PO3 (c) POX3 (d) H3PO2 7) Which catalyst is used in preparation of bromobenzene by bromination of benzene? (a)FeBr3 (b) HBr (c) AlBr3 (d) Br2 8) By which name the reaction CH3 - Br + Ag- F CH3F + AgBr is known? (a) Grignard (b) Wurtz (c) Fitting (d) Swartz 9) What are
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Unit 2 Lesson 5 16. a) 1‚2‚5 trimethylhexane b) 3 ethyl 2‚4‚6‚7 tetramethyloctane c) 2‚2 dimethylpentane 17. a) b) c) 18. C7H16 (l) + 11O2 (g) ---------> 7CO2 (g) + 8H2O Heptane + oxygen carbon dioxide + water * Takes 11 molecules of oxygen and 1 molecule of heptane to make 7 molecules of carbon dioxide and 8 molecules of water 19. a) A reason for this trend is that oil deposits were being found all around the world during the time period between 1910 and 2000
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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rise to four bending vibrations: scissoring (1465 cm−1 )‚ rocking (720 cm−1 )‚ wagging (1305 cm−1 ) and twisting (1300 cm−1 ). The intensity of the methylene CH2 rocking band is useful as four or more CH2 groups are required in a chain to produce a distinct band near 720 cm−1 . Shorter chains show a more variable band‚ for instance‚ the CH2 rocking band for C4 H10 is near 734 cm−1 . Although these are the main characteristic bands associated with aliphatic hydrocarbons‚ there are a number of bands
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