1. Sodium and potassium are the most frequently ecountered alkali metals‚ though rarely as the metal. Why these elements are rarely found as the metal? (Refer to the relative measurements tabulated in the form of electronegativities‚ ionization energies‚ or reduction potentials). These are due to the fact that their outer most orbital (ns1 valence electron configuration) has tendency to lose electron very easily and make stable configuration. The single valence electron is relatively far from the
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1. GENERAL INTRODUCTION The main aim of the organizational study is to acquire the knowledge regarding the functional as well as the management aspects of an organization It offers a unique opportunity to students to have hands on experience with industry while still in college. These are major aids in seeking employment after graduation. It exposes students to industry environment and work culture making it easier for them to transition from students to professionals. It gives a chance for the student
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and electric current p15.negatively charged ion j 16. poor conductors of heat and electric current Column B a. representative elements b. electronegativity c. atomic radius d. metals e. ionization energy f. cation g. noble gases h. alkali metals i. inner transition metals j. nonmetals k. ionic radius l. ion m. Group 2A n. transition metal o. halogens p. anion HW#2 CLASSIFYING THE ELEMENTS Part A Completion Use this completion exercise to check your understanding of
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Lithium‚Sodium‚Potassium‚Rubidium‚Caesium and Francium are all part of group 1.They are metals that can be easily cut.After being cut‚it is shiny but it quickly tarnishes due to the fact that the metal reacts quickly with oxygen or water.The shiny surfaces of Sodium quickly tarnishes more quickly than Lithium and Potassium more tarnishes more quickly than Lithium.This shows that the reactivity increases as we move down the group. Figure 1 Elements Melting point Boiling point Thermal
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them perfect elements in order to react with Group 1 and 2 metals since they want an electron which Group 1 and 2 are willing to give. Therefore‚ out of all the main group elements‚ Halogens react vigorously with Group 1 and Group 2 metals. All the alkali metals react vigorously with halogens to produce salts‚ most important NaCl and KCl. Sodium Chloride is used as a preservative for meat and to melt the ice on the roads. KCl is important for plant fertilizers since potassium helps plant growth. The
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contains an extensive review of the three main groups of catalysts‚ which have been estimated for the elimination of these hydrocarbons. These three groups of catalysts are dolomite‚ alkali metals and nickel. Keywords. MSW pyrolysis and gasification; Tar; Synthetic gas (syngas); Catalysts; Reforming; Dolomite; Alkali metals and nickel 1. Introduction Notible progress has been achieved in recent years in the design of gasifiers. Nevertheless‚ gas cleaning is still the bottleneck in advanced gas
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mixed with other alkali metals. Because these elements are very similar chemically‚ their separation presented numerous problems before the advent of ion-exchange methods and ion-specific complexing agents such as crown ethers. Once pure salts have been prepared‚ it is a straightforward task to convert them to the free metal. This can be done by electrolysis of the fused cyanide or by reduction with calcium or sodium followed by fractional distillation. Properties Rubidium is an alkali metal in group
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|WEEK |LEARNING OBJECTIVES |LEARNING OUTCOMES |ACTIVITIES |REMARKS | |1 |FORM 4 ORIENTATION | | |4/1 – 6/1 |
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Main factors affect the refined oil yield: 1‚ the alkali refining loss (1) for removal of colloid in hair oil‚ free fatty acid‚ moisture‚ impurities and other form of loss; (2) in the process caused by the loss of neutral oil saponification‚ emulsification; (3) theoretical calculation formula: alkali refining losses = 0.2 + 1.25 x (FFA % % + water + phosphatide content % % + 0.3% + impurities) 2‚ decoloring loss mainly for adsorption bleaching waste clay in oil absorption caused by the loss
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oap and detergent‚ soap [Credit: © Photos.com/Thinkstock]substances that‚ when dissolved in water‚ possess the ability to remove dirt from surfaces such as the human skin‚ textiles‚ and other solids. The seemingly simple process of cleaning a soiled surface is‚ in fact‚ complex and consists of the following physical-chemical steps: Wetting of the surface and‚ in the case of textiles‚ penetration of the fibre structure by wash liquor containing the detergent. Detergents (and other surface-active
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