I think i should post it here so that some1 else may get helped too. Here you go: ----------------------------------------------------------- I obtained my degree of Bachelors of Science in Electrical Engineering‚ with communications as a major from XYZ University of Engineering and Technology‚ in October 2004. I have been registered as a professional engineer with Pakistan Engineering Council (PEC). After graduation‚ I joined XYZ Pvt. Ltd as an Engineer in CDMA department. XYZ had been awarded
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Very Violent reaction | Very Violent | No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic forces of attraction between the ions) | No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic forces of attraction between the ions) | Na | | | | | | | Ca | Forms oxides | Metal sinks in water‚ effervescence seen;Metal hydroxide and hydrogen
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent Bonds Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms‚ in contrast to the transfer of electrons in ionic bonds. Such bonds lead
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CONTENTS Topics Page No ENERGY TYPES OF ENERGY ENERGY RESOURCES ADVANTAGES AND DISADVANTAGES ENERGY CONSERVATION REFERENCE ENERGY Energy is one of the most fundamental parts of our universe. We use energy to do work. Energy lights our cities. Energy powers our vehicles‚ trains‚ planes and rockets. Energy warms our homes‚ cooks our food‚ plays our music‚ gives us pictures on television. Energy powers machinery in factories
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Devra Burkhalter Physics 3rd Period February 4‚ 2013 The Scientist’s Major Contributions Scientists have vast involvement and contribution in the development and advancement of human civilization. Throughout the history of the world‚ many scientists have devoted their lives for research and innovation. Some of them even faced a lot of torture for their theories but they continued their mission and thus we are now in a modern world. Some of those dedicated scientists are Benjamin Franklin‚ Robert
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The 5th state of matter INTRODUCTION Ice is transformed to water at 0°C when the energy of its molecules (particles) increases. Water is similarly transformed to vapor at 100°C (Fig.1). Much stronger zigzag motion of the particles separates and ionizes hydrogen and oxygen i.e. plasma comes into existence (above 13 000 K). Do all bodies fit one of these four states of matter? The answer is: no‚ e.g. the solar corona does not! Fig. 1 The temperature scale. It starts at 0K. Is it infinite long
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Mechanistic roles of tyrosine 149 and serine 142 in UDP-galactose 4-epimerase from E. coli. Biochemistry 36‚ 10675–10684. 31. Mizuguchi‚ H.‚ Hayashi‚ H.‚ Okada‚ K.‚ Miyahara‚ I.‚ Hirotsu‚ K.‚ and Kagamiyama‚ H. (2001) Strain is more important than electrostatic interaction in controlling the pK a of the catalytic group in aspartate aminotransferase. Biochemistry 40‚ 353–360. 32. Druckmann‚ S.‚ Ottolenghi‚ M.‚ Pande‚ A.‚ Pande‚ J.‚ and Callender‚ R. H. (1982) Acid-base equilibrium of the Schiff base in
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O 29. 30. 31. 32. 33. 34. 35. 36. 37. b. Group 1A; 1 valence electron c. Group 5A; 5 valence electrons d. Group 2A; 2 valence electrons e. Group 7A; 7 valence electrons f. Group 4A; 4 valence electrons a. Cl b. S c. Al d. Li by gaining or losing electrons a. 2 b. 3 c. 1 d. 2 a. Al3+ b. Li+ c. Ba2+ d. K+ e. Ca2+ c. Sr2+ Most nonmetals gain 1‚ 2‚ or 3 electrons to achieve a noble-gas electron configuration. a. 3 b. 2 c. 1 d. 3 a. S2– b. Na+ c. F– d. P3– a
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atom to another. This gives one ion a positive charge and the other a negative one. The Opposite charges in the ion hold them together in a regular three dimensional lattice by electrostatic attractions; the arrangement of the ions in a crystalline lattice depends on the relative size of the ions. These electrostatic attractions are strong and this means that a large amount of energy is needed to overcome them and separate the ions‚ as a result of these ionic compounds have very high melting points
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Water • Define the terms solute‚ solvent and solution • Solute: Substances dissolved by the solvent (or the component present in a lower amount) • Solvent: Substances in which solutes are dissolved (or the component present in a larger amount) • Solution: A homogenous mixture of 2 or more substances • 1.1.2. Identify the importance of water as a solvent. • Water is distributed in the biosphere‚ lithosphere‚ hydrosphere and atmosphere • On earth‚ it is distributed as a solid‚ liquid and gas
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