13.7 g of pure MgSO4•xH2O‚ calculate the value for x. (a) 5 (b) 4 (c) 3 (d) 2 (e) 1 #5 A sample of lead ore has a density of 8.80 g/mL. It is composed of two lead compounds: lead oxide‚ PbO (density 9.10 g/mL) and lead selenide‚ PbS (density 8.10 g/mL). What is the percent of the ore is lead oxide? #6 A mixture of 13.1 g Zn and 22.0 g I2 is reacted to completion in a closed‚ evacuated container. What are the contents of the container after this reaction? Zn + I2 ZnI2
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solution was a transparent‚ colourless‚ homogenous liquid. Notes and observations on the reaction: Final: Blue solution- homogenous‚ transparent‚ low viscosity‚ liquid gas generated‚ heat is released‚ liquid changes colour- releases nitric oxide‚ copper ionised- dissolved in liquid‚ exothermic reaction- generation of heat to the external environment‚ no energy was provided- energy was taken in the form of heat. Chemical Change. reduction Where is the copper? Changed form- it is now
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Unit-II: MOS/BiCMOS Process Technology and Integration Introduction BiCMOS = CMOS + Bipolar (BJT) structures on the same substrate. Advantanges of CMOS device: 1. Low Power 2. High digital IC density. Advantages of Bipolar transistors: 1. Ability to deliver large drive currents 2. Capability to rapidly charge heavy loads. The implementation of digital bipolar circuits with emitter-coupled logic (ECL) gates permits small logic swings and excellent noise immunity
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Andy Chen and Alexander Van Buren 9/15/11 AP Chemistry Dr. Isotone Lab 1: Determination of the Empirical Formula of Silver Oxide Lab Objective: In this experiment‚ the percent composition and empirical formula of silver oxide will be determined. Silver oxide will be heated until it decomposes to silver metal and oxygen‚ and the percent calculation and empirical formula can be calculated based on combining the ratios of silver and oxygen in the reaction. Summary of
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Prelim Past questions – Chemical Earth. 1. What is the systematic name for a compound with the formula Cu2SO4? (A) (B) (C) (D) 3. In which compound do all atoms have the same electronic configuration? (A) (B) (C) (D) 4. Copper sulfide Copper (I) sulfate Copper (II) sulfate Copper disulfate LiF NaCl MgF2 NCl3 Identify the property which decreases across each row of the Periodic Table. (A) (B) (C) (D) Melting point Ionisation energy Valency Atomic radius
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involves reaction between the copper and nitric acid‚ and copper changed from elemental state to an aqueous. The second reaction converted the aqueous Cu2+ into the solid copper (2) hydroxide. In the third reaction Cu(OH)2 decomposed into copper 2 oxide and water when heated. When solid CuO reacted with sulfuric acid‚ the copper returned to solution as an ion (Cu2+). The cycle of reactions was completed with the reaction where elemental copper was regenerated by Zn and Cu exchanging states in acidic
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CASE STUDY 1: Xstrata Produced Acidic Oxide – SULFUR DIOXIDE Industrial Process – Sulfur Dioxide is an acidic oxide produced domestically and industrially in many ways. Xstrata‚ particularly Mount Isa Mines LTD‚ produces sulfur dioxide as a by-product from the extraction of copper from ores. Copper ore mined in Australia is predominantly chalcopyrite (CuFeS2)‚ a sulfide ore of copper. The extraction of copper begins with crushing the ore and subjecting the crushed ore to froth floatation. In
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enable comparison of the glucose concentrations of orange‚ lemon and grapefruit juice. Research: Benedict’s Reagent is a mixture of sodium compounds and copper sulphate. The copper ions are reduced by fructose (a reducing sugar) to form copper oxide‚ thus turning it from blue to a brick red/orange precipitate. The more red the precipitate is‚ the higher the concentration of reducing sugar in the solution tested. If more precipitate has formed‚ there are fewer copper ions remaining in the Benedict’s
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Solar Screen Professor Stansfield Writing for engineers sections F 12/10/12 Introduction In the wake of Hurricane sandy and other natural disasters a portable solar charged phone has been in demand. Our product the Solar Screen fills this void and offers a phone that does not need to be charged through the wall. This product creates an easier work environment in which there is no concern of being cut off in the middle of an important phone call as the result of a dead battery. This product
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and Carrie Gale – Rm 53 DECOMPOSITION OF COPPER CARBONATE (CuCO3) AIM – To investigate the thermal decomposition of copper carbonate. (qualitative assessment) HYPOTHESIS – The products of the decomposition of copper carbonate will be a metal oxide (CuO) and carbon dioxide gas. APPARATUS – ITEM QUANTITY/CONCENTRATION Copper carbonate 2 g Limewater (saturated Ca(OH)2 solution) 10 mL Bunsen burner Matches Test tubes 5 Retort stand‚ boss head and clamp 1 Gas delivery tube and cork stopper 1 Sulfuric
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