M1: Metallic bonding: Atoms within a solid metal are held together by metallic bonding, a metal bond is an electromagnetic attraction between electrons (delocalised so they’re shared between all the atoms in the structure, a sea of electrons) and the positive ions held within the lattice. The positive ions become attracted to these free electrons which form the lattice, this lattice structure and their metallic bonding gives them high melting points and good electrical conductivity properties. Due
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Human Biology Week 1: Worksheet 1. Consider the organization of life. Identify the different levels of organization from the cell to the organism. -The cell is the smallest unit displaying the properties of life that is the basic structural and functional unit of organisms. -Tissues are a group of similar cells that performs similar functions. - Organ is a structure that contains at least two different types of tissues that work together for a common purpose. -Organ system is a group of
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CHAPTER 12: STRUCTURES AND PROPERTIES OF CERAMICS (Written Report) Bartolazo INTRODUCTION Ceramic materials are inorganic and nonmetallic materials. Most ceramics are compounds between metallic and nonmetallic elements for which the inter-atomic bonds are either totally ionic, or predominantly ionic but having some covalent character. The term “ceramic” comes from the Greek word keramikos, which means “burnt stuff”, indicating that desirable properties of these materials are normally achieved through
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labratory in his bedroom. Linus was fascinated by these experiments, so he chose to become a chemical engineer. During high school Linus pursued his intrest in science by borrowing metal from an abandoned metal company, to complete experiments. Pauling then went off to college at Oregon Agricultural College, which is now called Oregon Stae University. In college he mainly studied how the chemical and physical properties of substances are like to the structures of atoms
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NH4Cl; Cl2; H2S; H2SO4 (c) HNO3; H2SO4; SO2; Na2O (d) H2O; H2S; NH3; CH4 4. The 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
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Atoms, Molecules and Ions. AN ATOM is the smallest particle of an element. They cannot be split into smaller particles in chemical reactions. Iron is made of iron atoms (Fe). Sulphur is made of sulphur atoms (S) A MOLECULE is a small group of atoms joined together. The atoms may be the same (e.g. O2) or different (e.g. H2O). The chemical formula shows the number and type of atoms present. Non-metal compounds are made of molecules: Carbon dioxide contains CO2 molecules Methane (natural gas)
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in a sea of electrons. Properties of Metals: Conduct Electricity-Usually Dense-Malleable, ductile-High Melting and Boiling Points. Diatomic Molecules-These consist of two atoms the same, covalently bonded. CHEMICAL REACTIONS Mixture-2 or more elements not combined by a chemical reaction. Compound-2 or more elements chemically combined. Combustion of fuels= Fuel + Oxygen -----> Water + Carbon Dioxide
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electrodes? Ans: A break junction is an electronic device which consists of two metal wires separated by a very thin gap, on the order of the inter-atomic spacing (less than a nanometer). This can be done by physically pulling the wires apart or through chemical etching or electromigration. As the wire breaks, the separation between the electrodes can be indirectly controlled by monitoring the electrical resistance of the junction. In this technique a metal wire is bent or pulled, often using a piezoelectric
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MINING AND WATER POLLUTION Water is essential to life on our planet. A prerequisite of sustainable development must be to ensure uncontaminated streams, rivers, lakes and oceans. There is growing public concern about the condition of fresh water in Canada. Mining affects fresh water through heavy use of water in processing ore, and through water pollution from discharged mine effluent and seepage from tailings and waste rock impoundments. Increasingly, human activities such as mining threaten the
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Drawing a Lewis Structure Lewis structure is the structure of a molecule in which dots are used to show the electron position around the atoms that make up the molecule. In order to produce the Lewis structure of a molecule, there are certain steps one needs to follow (they are five (5) in number). Basically what I will do is to use the molecule methane (CH4) as example to show you how to draw the Lewis structure of any molecule. First Step In order to produce the Lewis structure of methane
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