w w w e tr .X m eP e ap UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level .c rs om 5070/11 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB recommended) October/November 2011 1 hour *0909424295* 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
Free Oxygen Oxide Chlorine
ORGANIC AND INORGANIC CONSTITUENT IN ESSENTIAL IN PLANTS AND NUTRIENTS REQUIRED TO PLANTS Organic constituent DEFINITION An organ‚ system‚ or other discrete element of an organism the part of the plant that carries out photosynthesis. EXPLANATION: The chemical compounds of living things are known as organic compounds because of their association with organisms. Organic compounds‚ which are the compounds associated with life processes‚ are the subject matter of organic chemistry. Among the numerous
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highest content of total polyphenolics among other commercial vegetables studied. Sweet potatoes contain protein‚ dietary fiber‚ lipid‚ and essential minerals and nutrients such as calcium‚ phosphorous‚ magnesium‚ sodium‚ potassium‚ sulfur‚ iron‚ copper‚ zinc‚ manganese‚ aluminum and boron. Sweet potatoes are also important sources of vitamin A‚ thiamin‚
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Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor (a metal or a semiconductor) and an ionic conductor (the electrolyte)‚ and which involve electron transfer between the electrode and the electrolyte or species in solution. If a chemical reaction is driven by an external applied voltage‚ as in electrolysis‚ or if a voltage is created by a chemical reaction as in a battery‚ it is an electrochemical reaction
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but the solid form is far less prone to ignition. Zirconium is highly resistant to corrosion by alkalis‚ acids‚ salt water and other agents.However‚ it will dissolve in hydrochloric and sulfuric acid‚ especially when fluorine is present. Alloys with zinc become magnetic below 35 K. Zirconium’s melting point is 1855 °C (3371 °F)‚ and its boiling point is 4371 °C (7900 °F). Zirconium has an electronegativity of 1.33 on the Pauling scale. Of the elements within d-block‚ zirconium has the fourth lowest
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Australia provided Great Britain with many raw materials in the nineteenth century such as wool‚ to meet the demands of the new textile industry‚ wheat to feed the population and increase what was growing on British farms‚ metals such as gold‚ copper‚ lead‚ zinc‚ silver and tin‚ and other materials such as timber‚ tobacco‚ sugar and‚ when refrigeration was possible‚ meat. Sydney was sitting on top of a large amount of coal‚ which came near the surface around Wollongong‚ Newcastle and Lithgow. Sydney
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time to talk about The chemical elements and their origins‚ the creation of music‚ and the evolution of brass wind instruments. First and foremost The Trombone is made of an alloy of 70% copper and 30% zinc known as yellow brass. Copper’s origin while still under debate this is one way it could have formed. Copper may have originally formed
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Description of the experiment * Aim: To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent. Equipment: * 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper‚ zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders Steps: A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with
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------------------------------------------------- Aquatic Control ------------------------------------------------- A study of the effects of Zinc upon Lemnoideae. ------------------------------------------------- Student: Adam Marsh ------------------------------------------------- Class: Grade 12 Biology EEI ------------------------------------------------- Teacher: Mr. Hodo Abstract This report details the findings of an investigation surrounding the growth and death rate of Lemonodaie
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dioxide‚ in acid solution‚ to give manganese (II) ion. 6. When copper metal is placed in concentrated nitric acid‚ the solution turns green and brown coloured NO2 gas evolved. Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) a) Which element is reduced? b) Which element is oxidised? c) Which is the oxidising agent? d) Which is the reducing agent? 7. When metallic zinc is added to an aqueous solution of silver nitrate‚ zinc dissolves and silver is deposited. a) Write a balanced molecular
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