g-l d.g-m 5.which of the following staments are correct? i.pent-2-ene decolourises bromine water but pent-3-ene does not. ii.both have the same molar mass iii.both have the same molecular formula iv.both have the same physical properties a.i‚iv b.ii‚iii c.i‚ii‚iii d.ii‚iii‚iv paper 2 1.in an experiment‚bromine water is added drop by drop into the potassium iodide solution in a test tube until bromine water is in excess.the test tube is shaken. a.i.state the colour of the potassium iodide
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Experiment 1: Isolation of Casein from Milk * pH of milk – 6.6 * milk = 87.1% water‚ 4.9 % CHO 3.9 %‚ fats‚ 0.7% minerals Experiment 2: Protein Hydrolysis and Characterization | Reagents | Principle | Test for | Positive Result | Negative Result | Biuret | CuSO4‚ NaOH | Complexation of Cu+2 with amide N atoms | Polypeptide bonds | Violet/purple solution | Blue color solution | Sakaguchi | 10% NaOH‚ 0.02% α-naphtol solution‚ 2% NaOBr | arginine condenses with α-naphtol and NaOH
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intermolecular forces are van der walls & hydrogen bonds. • Ionization energy- E is required to remove an e- • Electronegivity- desire for electrons highest closer the the right • Highest ionization energy is helium • Potassium bromine the element bromine forms an anion • Alkali metals +earth metals conduct electricity • Covalent bonds form when 2 elements with high electroneg share a pair of electrons • Covalent compounds- 2 elements with high electroneg bond • In nature
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with zinc and acetic acid‚ C yields only: O O The structure of C is: I II IV A) B) C) D) E) III V I II III IV V Ans: E Topic: Structure Elucidation 4. Compound X has the molecular formula C6H10. X decolorizes bromine in carbon tetrachloride. X also 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
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Chemistry Assessment Coal is a combustible rock of organic origin composed mainly of carbon (50-98%)‚ hydrogen (3-13%) and oxygen with lesser amounts of nitrogen‚ sulphur and other elements. Some water is always present‚ as are grains of inorganic matter that form an incombustible residue known as ash. In New South Wales‚ black coal is mined near the eastern and western edges of the Sydney-Gunnedah Basin where the seams are relatively close to the surface. Mining along the western edge‚ where
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Bromocyclohexane This reacted in 10 seconds because bromocyclohexane is secondary bromine‚ and has steric strain‚ since it is a cyclic compound. The bigger steric in a molecule‚ the harder it is for the nucleophile to attack the leaving group (-Br) from the opposite sides‚ therefore‚ SN2 reaction is slower than SN1 for bromocyclohexane Bromocyclopentane This reacted instantly because bromocyclopentane is secondary bromine‚ and have bigger steric strain than bromocyclohexane‚ since it is a cyclic compound
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level CHEMISTRY Paper 1 Multiple Choice May/June 2005 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 5070/01 w w w e tr .X m eP e ap .c rs om READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the answer
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Conformational stereoisomer of butane Butane‚ C4H10 is an alkane with four carbon atoms which are bonded to each other by single bonds. Butane can form two isomers which are n-butane and isobutane. Figure1.1(a) and 1.1(b) shows the structures of n-butane and isobutane. Alkanes usually show conformational isomerism due the presence of C-C single bonds. It is important to understand that conformational isomer can only occur in compound with single bond but not double or triple bond. This is because
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bath to keep the reaction under control‚ and then sulfuric acid was added to the cold mixture. The sulfuric acid allowed for the metal in this case sodium to dissociate from the bromine atom allowing it to have a negative charge. The positive cation left on the carbon that lost the alcohol will be replaced by the bromine ion‚ creating 1-bromobutane. The lab students had to understand the basic separation techniques to conduct this lab safe and effectively. They had to setup a simple distillation
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Homework 1 (Ch. 1-2) 1. Make five qualitative and five quantitative observations about the room in which you now sit. a. Quantitative i. Have 1 desk ii. Have 2 monitors iii. Have 6 pillows on my bed iv. Dresser has 5 drawers v. Have 1 TV b. Qualitative i. Desk is steel and sturdy glass ii. Monitors are black and made manufactured by Dell iii. Pillows are filled with cotton or goose features iv. Dresser is made of a dark wood v. TV was purchased at Best Buy and was manufactured by Samsung 2. Describe
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