semi-conducting ferromagnetic alloys lead to different properties‚ as first predicted by White‚ Hogan‚ Suhl‚ Tian Abrie and Nakamura. Some alloys are made by melting and mixing two or more metals. Bronze‚ an alloy of copper and tin‚ was the first alloy discovered‚ during the prehistoric period now known as the bronze age; it was harder than pure copper and originally used to make tools and weapons‚ but was later superseded by metals and alloys with better properties. In later times bronze has been used for ornaments‚ bells‚ statues
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SOLIDS: Mass‚ Volume and Density Measurements A. Overview Review Sections 1.4 - 1.6 in your textbook (Chemistry: The Central Science‚ 9th Ed. ‚ Brown‚ LeMay‚ Bursten‚ & Burdge) This experiment will introduce you to a very important concept in science‚ especially chemistry: DENSITY. Density is the relationship between the mass of an object and the volume which it occupies. Solid substances generally have the greatest density‚ normally in the range of 1 - 25 g/cm3. Most liquids have densities between
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be in all of the offspring if a parent had it. It is the unnecessary increase of copper in the liver and brain. This is cause by a defect in the transport of copper. Wilson’s disease is a rare autosomal recessive disorder of the copper transport resulting in the copper buildup. It is also known as Hepatolenticular Degeneration as the scientific name. This mutation prevents the body from eliminating the extra copper. The symptoms include quivering in the upper extremities‚ Slowness of movement
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reaction of zinc with Copper 2 sulfate producing copper and zinc sulfate. How would I solve for delta H? In the second experiment we are trying to determine delta H for the hydration of anhydrous copper 2 sulfate. If anhydrous copper 2 sulfate powder is left in the atmosphere slowly absorbs water vapour giving the hydrate solid. The enthalpy change will need to be determined when 0.025 mol of anhydrous copper sulfate is dissolved in 50mL of water. The enthalpy change of the hydrated copper sulfate
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Ammonium + No Precipitate No precipitate Calcium 2+ No Precipitate Milky white precipitate Precipitate does not dissolve Copper 2+ No precipitate Became much darker blue and milky Iron 3+ Brighter yellow Orange precipitate that then dissolves Lead 2+ Milky white precipitate Precipitate gets more milky Silver + Milky white precipitate Precipitate gets more milky with ammonium Zinc 2+ No precipitate Milky white precipitate Precipitate dissolves Unknown No precipitate No precipitate Name Test Tube
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Technology Essay Ali Battery Only once in a lifetime will a new invention come about to touch every aspect of our lives. An important technology integrated into our society and around theworld is the invention of the Battery. Among many inventions of our modernworld‚ the battery stands out as an amazing on going development with its effect on almost every portable electric powered device. An electrical battery is acombination of one or more electrochemical cells‚ used to convert storedchemical
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27% tin‚ 5% copper‚ 1% zinc – overcame expansion problems History • 1960’s – conventional low-copper lathe-cut alloys • smaller particles – first generation high-copper alloys • Dispersalloy (Caulk) – admixture of spherical Ag-Cu eutectic particles with conventional lathe-cut – eliminated gamma-2 phase Classification According to content – Silver amalgam: Silver more than 65% – Copper amalgam: 70% Hg and 30% Cu According to presence or absence of Zn Zinc containing alloys
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(Cations) move away. Anode: Electrode which becomes negatively charged. During the process‚ positively charged ions (Cations) more towards the electrode whilst negatively charged ions (Anions) move away. [Electrodes for this experiment are firstly copper and secondly galvanized steel] (Wikipedia Editor ‚ 2012) (Wikipedia Editor ‚ 2012) (Columbia Electronic Encyclopedia‚ 2007) 2. Direct Current:
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electrode for mobile electrons to pass through. A galvanometer is always used to detect the electron flow of voltaic cell. The deflection of galvanometer indicates the electron flow of circuit. Electrolyte that has visible color change is always selected. Copper (II) Ion is one of the examples. The presence of such ion will eventually increase the blue intensity of the electrolyte if the concentration of such metal is higher than other metal. Throughout the mechanism of voltaic cell‚ redox reaction is occurred
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1. What occurs during the operation of a voltaic cell based on the following reaction? Ni (s) +Pb2+(aq) → Ni2+(aq) +Pb(s) External circuit Ion movement in solution A. electrons move from Ni to Pb Pb2+(aq) move away from Pb(s) B. electrons move from Ni to Pb Pb2+(aq) move toward Pb(s) C. electrons move from Pb to Ni Ni2+(aq) move away from Ni(s) D. electrons move from Pb to Ni Ni2+(aq) move toward Ni(s) (2) 2. Which processes occur during the electrolysis of molten sodium chloride? I.
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