1. Which of the following are the products of a homolytic cleavage of a C-C bond of ethane? A) 2 B) CH3 CH3 C) H D) 2 + + CH3 CH2H3 CH3 Ans: A Chapter 11 Topic: Radicals Section: 11.1 Difficulty Level: Easy 2. Which of the following is the most stable radical? A) B) C) D) E) Ans: B Chapter 11 Topic: Radicals Section: 11.1 Difficulty Level: Easy 3. In the molecule shown below‚ determine which of the labeled bonds is
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w w ap eP m e tr .X w om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education 0620/12 CHEMISTRY Paper 1 Multiple Choice May/June 2010 45 Minutes Additional Materials: *8778752636* Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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However‚ it would be the French chemist Antoine Lavoisier (1743 – 1794) who gave the gas its present name‚ and was able to explain the nature of the element‚ accurately describing its role in combustion that totally discredit the phlogiston theory. In addition‚ Lavoisier collaborated with others to develop a systematic chemical nomenclature that facilitates dialogue among chemists and is still very much in use today. Who Discovered Oxygen?
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Mary Eunice Agapito‚ Denmarc R. Aranas*‚ Limuel Joseph V. Bacani‚ and Steven Arthur Baluyot Analysis of Hydrocarbons Department of Biology‚ University of Santo Tomas‚ Manila‚ Philippines Abstract In this experiment we performed parallel chemical test method to identify an unknown. The reflux setup was used to prevent evaporation in mixing the reactants in an inert solvent with its boiling point. Another highlight of this experiment is the liquid-liquid extraction wherein a solution containing
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I Term Exam Chemistry Project Sunday‚ January 13‚ 2013 Grade/Section: Date: Question I: State whether each statement is true or false‚ then correct each incorrect statement. (7pts‚ 1 point each) 1- An Element is a substance that can be broken down into simpler substance by chemical means. 2- The Aufbau Principle states that energy levels must be filled from the highest to the lowest‚ when writing the election configuration. 3- Atomic radius decreases across a period
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w w ap eP m e tr .X w om .c s er June 2003 INTERNATIONAL GCSE MARKING SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0620/01 CHEMISTRY (Multiple Choice) Page 1 Mark Scheme IGCSE EXAMINATIONS – June 2003 Syllabus 0620 Question Number Key Question Number Key 1 2 3 4 5 C B A D A 21 22 23 24 25 B D A B D 6 7 8 9 10 C A A B C 26 27 28 29 30 B D D D B 11 12 13 14 15 B D C D
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Purpose: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. Materials: 1 Household Bleach‚ 2 mL 1 Distilled water 1 Toothpicks 2 Beaker‚ 50 mL‚ plastic 1 Cylinder-25-mL 1 Pencil‚ marking 1 Test Tube (5)‚ 13 x 100 mm in Bubble Bag 1 Well-Plate-24 1 Ammonium Molybdate‚ 0.2 M - 2 mL in Pipet 1 Aqueous Ammonia‚ 6 M‚ NH4OH - 4 mL in Pipet 1 Barium Chloride‚ 0.3 M - 2 mL in Pipet 1 Hydrochloric Acid‚ 6 M - 8 mL
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Chris M. Santiago October 29‚ 2014 Language Arts 10 Period 7 Recycling should be Mandatory for Everyone Would you like to live in a filthy atmosphere or do you prefer to breathe fresh air? You decide. Recycling is the act of collecting‚ separating and recreating used materials into new products. Not everyone recycles for various reasons‚ either they are too lazy or they just don’t care about the environment. “United States recycles about thirty-two percent of its waste today” ("Recycling Statistics”)
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product. (iii) An important safety precaution in the experiment is to prevent sucking back. (1) What is the potential hazard if sucking back occurs ? (2) How can sucking back be prevented ? (iv) If the gaseous product decolorizes a solution of bromine in tetrachloromethane‚ can you conclude that the gaseous product in ethene ? Explain your answer. (8 marks) 2. 93 3(b)(iii) When chemical wastes such as methylbenzene and tetrachloromethane are burnt in the incinerator in the plant‚ several
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EXTRACTION OF DNA FROM ONIONS ABSTRACT The purpose of the experiment was to experience firsthand the isolation of DNA form a plant tissue without destroying its structure and sequence. A white onion was used for the experiment. After several processes‚ DNA isolate was the visible result. Different chemical tests were performed on the DNA isolate‚ namely: Dische Test‚ Murexide Test‚ Wheeler-Johnson test and Test for Phosphate. Visible results were then noted. INTRODUCTION DNA (deoxyribonucleic
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