physical properties of solid metals can best be explained proposing that: (a) each metal atom is bonded in the crystal lattice by covalent bonds. (b) positive metal ions are arranged in an orderly way, with valence electrons free to move through the crystal lattice. (c) positive and negative metal ions are arranged in an orderly way, with mobile valence electrons able to immigrate easily around the crystal lattice. (d) each metal atom is surrounded by a variable
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arranged the elements, known at that time, in a periodic table by using properties of these elements and their compounds and used his table to predict the existence and properties of some elements not then discovered ● Classify elements as metals or non-metals according to their position in the periodic table ● Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells (energy levels) ● Demonstrate an understanding that the nucleus of an atom
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o The lower the boiling point the more volatile the element Chemical reactions of the halogens - The oxidising ability of the halogens increases as we go up the group Displacement reactions - Halogens will react with metal halides in solution in such a way that the halide in
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DUTY OF CARE The tort of negligence owes its origins to the tale of a decomposing snail that was found in a ginger-beer bottle – Donoghue v Stevenson (1932). The claimant, Mary Donoghue, went with a friend to a café, where her friend bought her a bottle of ginger beer. Donoghue opened it and poured some of the contents into a glass. When she finished this glass, she then poured the remainder of the bottle into the glass. At this point, the remains of the snail floated to the surface. This caused
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Drive Cone Cavity INTRODUCTION The drive cone cavity is one of the hottest un-cooled components in the engine. Operating around 900k at 10,000 rpm, the material used in making the drive cone is operating at edge of its safe working temperature changes at these high temperatures. A 10 K rise in shaft temperature can reduce the life of the shaft. The temperature must therefore be predicted to within 10 K or better to guarantee accurate stress predictions. It the thermal model cannot guarantee
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Batteries A battery is a combination of cells either in series or parallel or both, in order to get the required amount of electrical energy. It is a portable source of electrical energy. The galvanic cells used to form batteries can be classified as: 1.Primary cells: In these cells, the chemical energy is converted into electrical energy as long as the chemical components are active. 2.Secondary cells: In these cells, the redox reaction that converts chemical energy into electrical energy can be
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1. Atom The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons Atoms are made up of three basic particles: Protons-carries a positive charge Neutrons-carry no charge Electrons-carry a negative charge and encircles the nucleus. (http://education.jlab.org/atomtour/listofparticles.html) 2. Element A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the
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computer with the program to translate the instructions of the build, and the digital instructions for your build. 3D Printing is the process of using a computer controlled printing head that travels along the X,Y, and Z axis that leave layers of molten plastic or bio organic material on a flat surface or The prices of 3D Printers vary by model, make and the company who makes it. The cheapest home built device may cost between 150-300 dollars to professional built devices ranging from 6000 to 48
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Part Four Most rocks on earth are much younger than earth itself, but how's that? It's not because the earths rock just up'd and left and new rocks came in, it's because of the earths molten rock. Due to plate tectonics, rocks shift, crumble, and cycle through the earths layers. Old rock is recycled into molten rock, and then cooled to become new rock. The particles in the rock are still as old as the earth, if not older, but the rocks themselves are new. Section Two, Part Five Earth is made
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Assignment On Engineering Materials (Glass) Introduction Glass is a non-crystalline solid material. Glasses are typically brittle, and often optically transparent. The most prevalent type of glass, used for centuries in windows and drinking vessels, is soda-lime glass, made of about 75% silica (SiO2) plus Na2O, CaO, and several minor additives. Often, the term glass is used in a restricted sense to refer to this specific use. [pic] [pic]Roman Cage Cup from the 4th century A.D. In
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