29) The structural formulas are given for these cis or trans alkenes. (a) trans-1‚2-dichloropropane (b) cis-2-pentene (c) cis-3-hexene (d) trans-2-hexene Write the structural formula for: (a) cis-1‚2-dichloropropene (b) trans-2-pentene (c) trans-3-hexene (d) cis-2-hexene 30) In each case‚ tell whether cis and trans exist. If they do‚ write the structural formulas for two isomers and label each cis or trans‚ (a) Br2CH2 : No (b) CH3CH2CH=CHCH2CH3: Yes (c) CH3CH=CHCH3:
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β-unsaturated ketone such as the product in this experiment: trans-p-anisalacetophenone1. The major product of an aldol condensation is usually observed as a trans product as it provides less steric hindrance due to the substituents on each side of the alkene being placed farther apart1. 2‚4-dinitrophenylhydrazine is also used in this experiment to indicate the presence of a ketone. When hydrazine is reacted with a ketone in acidic conditions it produces 2‚4-dinitrophenylhydrazone which is a bright red
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Air Pollution in Hong Kong Chemistry Project the Written Report 1.Introduction 3 2.Sources of Air Pollution 3 - 7 1.Vehicles 4 - 5 1. Pollutants produced by vehicles 4 2. Reasons why pollutants are produced 4 3. Impacts of the pollutants from vehicles 4 - 5 4. Method to eliminate pollutants 5 2.Power Stations 6 - 7 1. Pollutants produced by power stations 6 2. Reasons why pollutants are produced 6 3. Impacts of the pollutants from power stations 6 4. Methods to eliminate
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mass spec can be seen in figure 6. According to the experimental IR spectroscopy for the E isomer of phenylcinnamic acid the peaks of the wavenumber were at 2952‚ 2518 1672 and 1426 cm-1. The peak at 2952 presents the double bond CH stretch for the alkene carbon. The peak at 2518 presents the carboxylic acid –OH peak. The peak at 1672 could present the carbonyl group. The aromatic ring peaks are around 1600 and 1426-1492. Different values could be seen for the z isomer. The wavenumbers for the IR
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H B621/02 GENERAL CERTIFICATE OF SECONDARY EDUCATION GATEWAY SCIENCE SCIENCE B UNIT 1: Modules B1 C1 P1 (Higher Tier) TUESDAY 15 JANUARY 2008 Afternoon Time: 1 hour *CUP/T45720* Candidates answer on the question paper. Additional materials (enclosed): None Calculators may be used. Additional materials: Pencil Ruler (cm/mm) INSTRUCTIONS TO CANDIDATES • • • • • • • Write your name in capital letters‚ your Centre Number and Candidate Number in the boxes above. Use blue or black ink. Pencil may
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Functional Groups of Organic Compounds A functional group is a specific arrangement of atoms in the HC derivative other than carbon and hydrogen. Literally‚ the functional group determines the functions of the particular HC derivative in chemical reactions. This means that the specific properties of the HC derivative are due to its functional group. Each functional group is attached to an alkyl radical (R). An alkyl radical is one H atom less than the given alkane. The alkyl radical (R) uses
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Amines are aliphatic and aromatic derivatives of ammonia. Amines‚ like ammonia‚ are weak bases (Kb = 10−4 to 10−6). This basicity is due to the unshared electron pair on the nitrogen atom. Classification and nomenclature of amines Amines are classified as primary‚ secondary‚ or tertiary based upon the number of carbon-containing groups that are attached to the nitrogen atom. Those amine compounds that have only one group attached to the nitrogen atom are primary‚ while those with two or three
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Chem 3418 Organic Chemistry Laboratory I Acid Base Review Definition In general‚ an acid is a substance that can donate a proton (H+) and a base is a substance that can accept a proton. Any proton in an organic molecule can potentially be donated. The most acidic proton in a molecule would be donated first. Any lone pair in an organic molecule can act as the proton acceptor. An acid (HA) reacts with a base (in this case H2O) to form the conjugate base of the acid (A-) and the conjugate acid of the
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molybdenum-chromium binary oxide catalyst. Journal of Catalysis‚ 66‚ 267}280. Vaiser‚ V.L. (1949). Doklady Akademic Nauk SSSR‚ 67‚ 839 [cf. Kamneva and Pan"lova (1965)]. Van Sickle‚ D.E.‚ Mayo‚ F.R.‚ & Arluck‚ R.M. (1965). Liquid-phase oxidation of cyclic alkenes. Journal of American Chemical Society‚ 87 : 21 (5)‚ 4824}4832. Wen‚ Y.‚ Potter‚ O.E.‚ & Sridhar‚ T. (1997). Uncatalysed oxidation of cyclohexane in a continuous reactor. Chemical Engineering Science‚ 52 (24)‚ 4593}4608. Acknowledgements The authors
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Sample Paper NAT IM VERBAL Complete the sentences by choosing the most appropriate word‚ from the given lettered choices (A to D) below each. 1. Sensory cells _______ impulses by producing electrical signals. A. responding B. to respond C. respond to D. respond Each question below consists of a related pair of words‚ followed by five lettered pairs of words. Select the lettered pair that best expresses a relationship similar to that expressed in the original pair
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