the stratosphere due to its faster destruction by chemicals released by man into the environment. Depletion is mainly caused by chlorofluoro carbons (CFCs)‚ halons‚ methyl chloroform and carbon tetrachloride. There substances contain chlorine or‚ bromine which‚ can reach the stratosphere. These elements are capable of catalytically breaking down ozone into oxygen. Ozone depletion can also be caused by supersonic jet exhausts. They liberate NO which reacts with 03 to form N02 and 02 The area on the
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Hydrofluorination) of ethylene: ▪ ethylene + hydrogen fluoride [pic] fluoroethane ▪ C2H4 (g) + HFl (g) [pic]C2H5Fl (g) – Reaction of cyclohexene with bromine water: ▪ cyclohexene + bromine water[pic] 2-bromo-1-cyclohexane ▪ C6H10 (l) + Br2 (aq) [pic] C6H10Br2 (aq) – Reaction of cyclohexane with bromine water (subsitution reaction‚ only under sunlight‚ that is UV light): ▪ C6H12 (l) + Br2(aq) [pic]C6H11Br(aq) + HBr(aq) • Fermentation and combustion
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Pluto’s moon? -CHARON 19. The 3 main parts of a comet are the nucleus‚ the tail‚ & the? -COMA 20. What human organ cleans fifty gallons of blood everyday? -KIDNEY 21. What’s the only metal that’s not a solid at room temperature? -BROMINE 22. English chemist & physicist discovered hydrogen. - HENRY CAVENDISH 23. From whta school did the nursing board topnotch of 2007 came from? -OUR LADY OF FATIMA 24. Which type of matter has a definite volume but no definite shape? -MATTER
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Starbucks Corporation Since implementing its supplier social responsibility standards in 2006‚ Starbucks has engaged in more than 500 factory assessments and continues to work with more than 70 factories on improving their social and environmental standards. As part of its 2015 global-responsibility goals‚ Starbucks aims to volunteer one million community service hours globally. Starbucks has achieved LEED certification for 116 stores in 12 countries‚ with 69 per cent of company-owned stores
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Periodic Table The periodic table is a table‚ where all known chemical elements are arranged. They are organized on the basis of their atomic numbers‚ electrons and chemical properties. The atomic of an element is the same as the number of electrons or protons in that particular atom. They elements in the table are placed in order from the lowest to the highest. 429768018669000The periodic table is ordered into periods and groups. A row of elements across the periodic table is calleda a period
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You are probably wondering what this table of colourful boxes is? Well you’ve come to the right place‚ I hope. What is it? Well everything in the world is made up of elements‚ well almost everything‚ light‚ heat‚ this is energy‚ another story. And elements are a single type of atom‚ the periodic table is basically a table of all know elements to man. What’s in it? To understand what’s in it we need to look at an atom and it subatomic parts. An atom is made up of an Electron(e-) this has a negative
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radicals substitution 4. 5. 6. Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation‚ electrophile and Markovnikov’s Rule. 9. Propose mechanism on reaction addition of cold sulphuric acid and Hydrogen halide Alkanes Nomenclature of Alkanes Sources & Importance of Alkanes A. Natural Gas Consists of 90-95% methane with lesser amounts of ethane and other low-molecular-weight hydrocarbons
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mass number is used to calculate the number of in one atom of an element. In order to calculate the number of neutrons you must subtract the from the . 7. Give the symbol and number of protons in one atom of: Lithium Bromine Iron Copper Oxygen Mercury Arsenic Helium 8. Give the symbol and number of electrons in a neutral atom of: Uranium Chlorine Boron Iodine Antimony Argon
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Going back to our reaction mechanisms‚ we were looking at SN1 and SN2 reactions‚ so we of course used the hydrobromic acid as our acid catalyst which would be protonating the hydroxyl group of our butanol‚ to make a better leaving group‚ so that the bromine radical would be able to attack the leftover carbocation. Our group used 2-bromobutanol and we expected‚ from our mechanism‚ to achieve 2-bromobutane and when we compared our GC results to the prepared sample‚ our mechanism proved to be true. We did
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In order to first perform the reaction‚ 1.5 mL of 4-methylcyclohexanol was added to a pre-weighed 5mL conical vial. The conical vial was then weighed to find the actual mass of 4-methylcycloheaxanol. Then‚ 0.4mL of 85% phosphoric acid was added to the conical vial using a plastic pipet. Six drops of concentrated sulfuric acid was then added to the vial using a glass pipet. A spin vane was then added before adding the Hickman head‚ water condenser and a drying tube packed with calcium chloride to
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