by : Directorate of Education‚ Delhi SOME IMPORTANT REASONING BASED QUESTIONS OF ORGANIC CHEMISTRY 1. Chlorobenzene is less reactive than chloromethane. Ans. In chlorobenzene‚ each carbon atom of benzenering is sp2 hyridised and is electron withdrawing. Chlorine atom donates a lone pair of electron and acquire positive charge. The negative charge is delocalised on ortho and para position by resonance. C-Cl bond acquires partial double bond character and is 169 pm as compared to 17.0 pm in chloromethane
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Fireworks and What Makes Them Go Sparks! Colors! Things that go BOOM! Chemistry doesn’t get much better than this. Ever notice how minutes drag on for hours when you’re waiting for a fireworks show to begin? Everyone’s thinking the same thing: The sky is dark enough the hot dogs are all eaten…come on when are they going to start? Then the first rockets streak into the sky…Ooh! Aah! Yes‚ it was worth the wait. The birthplace of fireworks is generally recognized as China.
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Milgram of Yale University conducted a controversial and influential experiments on study of the effect of punishment on learning. Nearly 1000 people participated in Milgram’s 20 experiments. The participants assigned to be a learner and a teacher. Milgram created an electric ’shock generator’; it ranged from 15-450 volts. The teachers were given a task to teach and then test the learner on a list of word pairs. For the first wrong answer‚ the teacher will flip the switch labeled "15 volts". If the learner
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joined‚ or rearranged. Atoms of one element‚ however are ______ changed into the atoms of another element. 19) What three parts of Dalton’s Atomic Theory have been adjusted and why? 20) What is the picture to the right displaying? Who did this experiment? What was discovered from this? 21) E. Goldstein discovered _____ _____ were rays travelling in the
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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* Introduction to Organic Chemistry Understand the basis of drawing organic structures Depicting 3-D structures in 2-D Most organic compounds have a three-dimensional structure. How do we represent structures on our two-dimensional page? For example‚ methane is a tetrahedral molecule: Bonds in the plane of the paper: Bonds coming towards the observer: (out of the page) Bonds going away
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oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes‚ which release heat and light‚ occur during the combustion process. | | 3. | | Which identification is incorrect for the elements listed? Your Answer: | Zn‚ zirconium | | | Zn is zinc; Zr is zirconium
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Kayla Adkins Forensic Chemistry Exam 2 I have been honest and observed no dishonesty. 1. In specific detail‚ describe a published procedure for the definitive identification of Heroin utilizing gas chromatography-mass spectroscopy (GCMS). Heroin is a white crystalline powder with no odor and a bitter taste. It is a derivative of morphine in that the –OH (hydroxyl group) is replaced by an acetyl group‚ -OCOCH3 and has a molecular formula is C21H23NO5 with a molecular weight of 369.42
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Match and Water in a Glass Science Magic Trick Fun Trick with Fire and Water This is a simple and interesting science magic trick involving fire and water. All you need is water‚ a glass‚ a plate‚ and a couple of matches. Pour water into a plate‚ light a match in the center of the dish and cover it with a glass. The water will be drawn into the glass. Match and Water Trick Materials • plate • water • 2 wooden matches • a quarter or other large coin • colored water
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CHEMISTRY IN THE KITCHEN Presented by: Jose Martin Jaca Jerizza Nina Vidal Krysha Jade Pepito Mae Karen Apas Jose Romano Jr. Feb Daphne Kay Ornopia Ma. Trisha Tiffany Uy Chemistry in the Kitchen 1. Growing Food 1.1 Chemicals Needed for Life 1.2 Fertilizers and their Problems 1.3 pH of Soil 1.4 Hunger Problems 2. Cooking 2.1 Physical and Chemical Change 2.2 Effects of Cooking 3. What is Cooking?: Methods of Cooking 3.1 Baking: Chocolate Chip Cookies 3.2 Frying: French Fries
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