Write your name here Surname Other names Centre Number Candidate Number Edexcel IGCSE Chemistry Unit: 4CH0 Science (Double Award) 4SC0 Paper: 1C Wednesday 25 May 2011 – Morning Time: 2 hours Paper Reference 4CH0/1C 4SC0/1C You must have: Ruler Candidates may use a calculator. Total Marks Instructions black ink or • Usein the boxesball-point pen. page with your name‚ Fill at the top of this • centre number and candidate number. all • Answer
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Oxygen Revolution {text:bookmark-start} {text:bookmark-end} Oxygen Revolution {text:bookmark-start} {text:bookmark-end} Oxygen Revolution The oxygen revolution‚ which is sometimes known as the oxygen catastrophe is believed to have occurred about 2.4 billion years ago with the evolution of cyanobacteria‚ a type of blue- green algae. Before this time‚ the atmosphere had a very different chemical make-up‚ high in carbon molecules; unsustainable for life as known today. These prokaryotes
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The tires absorb moisture from roads while in motion. It can also pull carbon dioxide out of the air to fuel the moss’ photosynthesis which has clean oxygen as its byproduct. Absorbing 4‚000 tons of C02 a year Goodyear’s estimate is that the Oxygene‚ if all the 2.5 million vehicles in Paris switch to the brand‚ could produce 3‚000 tons of oxygen and absorb more than 4‚000 tons of carbon dioxide annually. The tire‚ however‚ goes beyond cleaning the air.
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In the article‚ “Oceans Are Losing Oxygen—and Becoming More Hostile to Life” by Craig Welch‚ climate change is affecting the lives of all kinds of sea creatures. This article explains how climate change‚ and the warming of ocean water‚ has began taking oxygen out of the water. This means that many fish species have shrunk because of this loss of oxygen. The warmer water speeds up the metabolism of these fish‚ which makes them breathe in more of the oxygen. A couple of scientists from the University
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Gabby Dodgson 2A Oxygen Atom Essay A Day in the Life Being an oxygen atom isn’t as easy as it sounds‚ humans love us so much and those other atoms are always trying to attach themselves to us. Honestly‚ can they be anymore clingy? Really were the Michael Jordan’s of the element world. Todays the day I leave my home in the Tundra Biome‚ finally graduated from the periodic table and am on my way to the Tropics. I can’t wait‚ I’m so sick of this freezing weather and lack of any biotic diversity.
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have the chemical structures of Carbon‚ Hydrogen‚ Oxygen and Nitrogen. Proteins have various functions such as making and breaking chemical bonds‚ transport‚ movement‚ signaling‚ regulation and metabolism (cellular process). Peptide Bonds are important while discussing proteins. Peptide Bonds are covalent bonds that join 2 amino acids‚ amino acids are also proteins monomer. Next are Carbohydrates. Carbohydrates incorporate Carbon‚ Hydrogen and Oxygen in a 1:2:1 ratio. They provide short term energy
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Analysis of Oxygen bearing Organic compounds Abstract The Unknown sample in the experiment can be tested to yield results such as 1° (primary)‚ 2° (secondary)‚ 3° (tertiary) alcohols. Tests such as the dichromate test‚ Tollen’s test‚ Lucas test‚ DNPH test and iodoform test would be very useful in determining the type of alcohol that the unknown sample belongs to. In the experiment‚ the unknown sample underwent series of testing to identify what property of alcohol it belonged to and the result
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Diary of an Oxygen Thief Anonymous‚ I have not read any other books by this author. Fiction Characters: There aren’t any other characters beside the one person who he doesn’t say his name‚ but he is the speaker of the story‚ he is an Irish man and was born in Kilkenny Ireland. This book is first person view‚ making the speaker the main character. In the story the speaker describes his past events and how he wished to fix his mistakes. He describes how he hurt girls when he was in his 20’s‚ by hurting
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Smithsonian Laboratory Early Atmosphere 1. How abundant was oxygen in the early atmosphere? The earth’s early atmosphere contained only small amounts of free oxygen‚ produced by the reaction of water vapor with sunlight. The oxygen rich atmosphere that developed later and on which oxygen breathing life now depends was result of the origin and spread of organisms capable of photosynthesis. 2. What evidence do scientists have that the oxygen content of our atmosphere has increased since the earth’s
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CH201L S.Y. 2014-2015 Analysis of Oxygen-Bearing Organic Compound 2 BS Chemistry‚ College of Science‚ University of Santo Tomas Espana‚ Manila Philippines 1015 Abstract An unknown sample was given along with five standards to test the presence of oxygen in the sample. The unknown sample underwent five different chemical analysis namely Dichromate test‚ Tollen’s test‚ Lucas test‚ DNPH test‚ and Iodoform test. Each test will determine if the unknown sample will have the same reaction as
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