Si + 2H2O → SiO2 + 2H2 The oxidation process can be implemented through diffusion of either water or an oxygen species through the oxide already formed up which then reacts with the silicon at the Si-SiO2 interface. At high temperature‚ thermal energy makes oxygen molecule moving much faster‚ which can drive them to diffuse across an existing oxide layer and react with Si to form SiO2. As the oxidation continues‚ the interface moves into the silicon and a new‚ clean silicon surface is produced
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OUR OWN HIGH SCHOOL‚ Al WARQA’A‚ DUBAI SUMMATIVE EXAMINATION-2‚ MARCH -2014 Name: ______________________________________ Grade: VII Sec: ____ M Marks: 90 Time: 2 1/2 hours Subject: SCIENCE Date: 09/04/2014 General Instructions: 1. This question paper has 4 pages. 2. All questions are compulsory. 3. Question numbers 1 to 10 are questions of one mark each. 4. Questions 11 to 16 are very short answer questions of two marks each. 5. Question numbers 17 to 24 are short answer questions of 3 marks each
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information. The simplest compounds contain just two elements. Sodium chloride‚ NaCl‚ is an example of a binary compound. Several other examples are listed below. Potassium bromide KBr Calcium bromide CaBr2 Lithium fluoride LiF Lithium oxide Li2O When naming binary compounds follow these rules: 1. the element with the positive ionic charge is written first. 2. The second word is formed by changing the ending of the name of the element to “ide.” For example‚ bromine changes to bromide
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gives aluminium oxide and water 2. Iron (iii) oxide reacts with carbon forming iron and carbonmonoxide 3. Hydrogen peroxide reacts with lead sulphide forming lead sulphate and water 4. Lithium reacts with nitrogen forming lithium nitride 5. Nickel sulphate reacts with sodium phosphate to form nickel phosphate and sodium sulphate 6. Silver oxide reacts with hydrogen peroxide to form silver ‚ water and oxygen 7. Ammonia combines wuth oxygen to get nitrogen oxide and water
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Strontium Manganese Oxide Introduction The ternary inter oxide SrMnO3 was first characterized by XRD by Negas and Roth []. This perovskite type inter oxide crystallizes in the hexagonal form with the space group P63/mmC(194). This inter oxide is of considerable interest to materials scientists owing to its ability to accommodate a high degree of anion vacancies‚ crystal structure and its high Neel Temperature (TN). It also exhibits polymorphism with two different cubic and hexagonal structures
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Chemistry Notes Oxides Oxides are used to determine whether an element is a metal or a non-metal. Most non-metals are classed as acidic oxides. While most metals are classed as basicoxides. Acidic Oxides * Reacts with water to form acids * Neutralises alkaline solution to form salt + water Basic Oxides * Neutralises acidic solutions to form salt + water Amphoeteric Oxides * These are non-metals which display both acidic and basic properties Alkaline Oxides * Reacts with
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Metal Binary Salts Description Fixed Charge Metal* + a Nonmetal Rule: Full name of the metal + Stem on the nonmetal + the suffix “ide” Formula Name NaCl Sodium chloride CsF Cesium fluoride CaBr2 Calcium bromide MgO Magnesium oxide Li2S Lithium sulfide Al2O3 Aluminum oxide ZnH2 Zinc hydride AgI Silver iodide SrS Strontium sulfide Ca3N2 Calcium nitride K2Te Potassium telluride Na3N Sodium nitride CaC2 Calcium carbide LiH Lithium hydride Mg3P2 Magnesium phosphide Memorize your fixed charge metals
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Chapter 1 – Chemical Reactions and Equations Science Why should a magnesium ribbon be cleaned before burning in air? Answer Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question 2: Write the balanced
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atmospheric condition i.e.‚ moist air‚ carbon dioxide form undesirable compounds on the surface is known as corrosion‚ The compounds formed are usually oxides . Rusting is also a type of corrosion but the term is restricted to iron or products made from it .Iron is easily prone to rusting making its surface rough. Chemically‚ rust is a hydrated ferric oxide. Titanic‘s bow exhibiting microbial corrosion damage in the form of ‘rusticles’ Rusting an Electrochemical Mechanism ; Rusting may be explained
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rocket? d. How many grams of H20 are made when 450. kg of N204 are consumed? jjj2. Joseph Priestley is credited with the discovery of oxygen. He produced O.‚ by heating mercurv(II) oxide‚ HgO‚ to decompose it into its elements. How many moles of oxygen could Priestley have produced if he had decomposed 517.84 g of mercury oxide? 0. Iron(III) chloride‚ FeCl3‚ can be made by the reaction of iron with chlorine gas. How much iron‚ in grams‚ will be needed to completely react with 58.0 g of Cl2? 194. Sodium
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