Conteaza cine spune primul! Gustave Le Bon scria în cartea Psihologia multimilor: "Am spus ca una din caracteristicile generale ale multimilor este excesiva lor sugestibilitate si am aratat cât de contagioasa este osugestie în rândul oricarei aglomerari umane‚ care explica orientarea rapida a sentimentelor într-o directie determinata. Oricât de neutra am presupune-o‚ multimea se afla într-o stare de expectativa atenta‚ favorabila sugestiei. Prima sugestie formulata se impune imediat prin contagiune
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Metals and alloys. Hume-Rothery rules. 1. Three types of metals. 2. Alloys. Hume-Rothery rules. 3. Electrical resistance of metallic alloys. 4. Applications of metallic alloys. 5. Steels. Super alloys. 6. Electromigration in thin wires. Three types of metals Metals share common features that define them as a separate class of materials: • Good thermal and electrical conductors (Why?). • Electrical resistance increases with temperature (Why?). • Specific heat grows linearly with temperature
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shared practice. This takes time and sustained interaction” (2007). We see this within cheerleading at the collegiate level due to the necessities of prior knowledge of the sport‚ and the high competitive nature reached as a division one program at CU. Having background knowledge of the three categories of cheerleading; stunting‚ tumbling‚ and cheer‚ are detrimental to the development of the teams. Each member of both teams bring previous knowledge and experience to the program allowing collaboration
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Pb(OH)2 (white ppt) Blue ppt.[i] Soluble in excess aqueous ammonia to form a dark blue solution. [m] Cu2+ + 2OH- Cu(OH)2 (blue ppt) Cu(OH)2 + 4NH3(aq) [Cu(NH3)4]2+(aq) Dark green ppt. Insoluble in excess aqueous ammonia. Reddish-Brown ppt. Insoluble in excess aqueous ammonia. calcium aluminium lead(II) copper (II) Blue ppt. [g] Insoluble in excess aq. NaOH. Cu2+ + 2OH- Cu(OH)2 (blue ppt) Dark green ppt. [h] Insoluble in excess aq. NaOH. Fe2+ + 2OH- Fe(OH)2 (dark green ppt) Reddish-Brown
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Melissa Benning Introduction The purpose of the coordination complex lab is to determine the absorbance spectra of complexes based on their color. Every complex has its own color which results from the wavelengths of white light it reflects. The complexes will be compared by the color each reflects and by the energy of the waves each absorbs. The purity of the synthesized complex will also be found. Procedure Part I: Preparation of the Complex A sample of copper sulfate pentahydrate (6.285g)
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Emission Spectra & Flame Tests Intro The emission spectrum is used in modern chemistry to help further studies of wavelengths and the spectrum. When a metal in a compound reacts in a flame and produces a color‚ it helps to show the strongest color in the emission spectrum. The purpose of performing these operations on the flame was to see how different metals would react. Using a spectroscope‚ it is possible to observe the line emission spectrum produced by sunlight‚ artificial light‚ and
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Complex • The usual coordination number is two‚ four and six (WHY??) • The complex formed can be positive‚ negative charge or neutral. A complex ion [Cu(NH3)4]2+ Centre ion Ligand 5 Coordination complex • E.g. of complexes with a coordination number of four are: Cu(NH3)42+ positive charge‚ ammonia ligand is unidentate. Cu(NH2CH2COO)2 neutral‚ the ligand glycine is bidentate. CuCl42- negative charge‚ ligand chloride is unidentate. 6 Coordination complex • In the analysis
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| National Flag of BRUNEI | | | Economy - overview: | | Brunei has a small well-to-do economy that encompasses a mixture of foreign and domestic entrepreneurship‚ government regulation‚ welfare measures‚ and village tradition. Crude oil and natural gas production account for just over half of GDP and more than 90% of exports. Per capita GDP is among the highest in Asia‚ and substantial income from overseas investment supplements income from domestic production. The government provides
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by Lau and Marsee (2012) examined the correlation between the callous-unemotional personality traits (CU)‚ narcissism‚ psychopathy‚ and Machiavellianism‚ and aggression in young boys. This study found a significant correlation showing a similarity between the three personality traits narcissism‚ psychopathy‚ and Machiavellianism. Results also indicated that there was a correlation between those CU personality traits and different types of aggression (overt and relational)‚ delinquency‚ behavioral
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Iron atoms were oxidized‚ giving two electrons to copper ions which were reduced. 3. What type of reaction was this? Why did it take place? Using the activity series of metals‚ explain why this reaction was possible. (16 pts.) Fe + Cu^+2(aq) ---> Fe^+2(aq) + Cu. This was a single displacement reaction. It took place‚ because the iron atoms gave up two of their electrons to the Cu2+. 4. What was the solid product that formed on the nails? How do you know this? It was rust. When iron comes in
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