A metal is defined as an opaque shiny element which possesses properties such as malleability and ductility. Malleable meaning that they can be hammered into shapes and ductile meaning they can be drawn into wires. They are also very strong and posses high tensile strength and are good conductors of heat and electricity. Metals are shiny‚ and also have high densities. Metals are a very important and significant part of chemistry. However‚ their importance is not just limited to chemistry; they are
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Chemical Prperties of Metals Most metals are chemically reactive‚ reacting with oxygen in the air to form oxides over changing timescales (for example iron rusts over years and potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals‚ found in the leftmost two groups of the periodic table. Examples: 4Na + O2 → 2Na2O (sodium oxide) 2Ca + O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to
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Positivist and Constructionist Theories: Basic Differences Dana L Ward Athens State University Positivist and Constructionist Theories: Basic Differences There is a basic difference in the two theories known as positivist and constructionist in sociology. It is considered determinism. In order to understand the theories and deviance‚ one must understand determinism. What is determinism? It is the belief that everything is already decided and occurs based on every thought‚ action and feeling
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Alkali Metals Introduction Alkali metals refer to six elements belonging to the Group IA of the long form of the Modern Periodic Table‚ viz. Lithium (Li)‚ Sodium (Na)‚ Potassium (K)‚ Rubidium (Rb)‚ Cesium (Cs) and Francium (Fr). Fr is a radioactive element. These elements are called so because they form strongly alkaline oxides and hydroxides. Electronic Configuration of Alkali Metals Each of the alkali metals has one electron in their outermost (valence) shell‚ which is just outside an inert
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EXTRACTION OF METALS SUMMARY Most metals exist in compounds in rocks in the Earth’s crust. Many of these ores contain oxides or sulphides of the metals. The compounds need to be reduced to produce the metals as elements. Metals are very useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity
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TITLE: -2nd ASSIGNMENTS QUESTIONS: 1. (a)Give the Contribution of David K Berlo and his Basic Ideas Established in the Theories of Mass Communication. (b) Trace the Biography of D. K. Berlo. 2. (a) Give some Established Notions of Man and Society Propounded by Max Weber. (b) Give the Biography of Max Weber.
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Process of forming the government Singapore (Presidential form of government) The Government of Singapore is defined by the Constitution of the Republic of Singapore to mean the Executive branch of government‚ which is made up of the President and the Cabinet of Singapore. Although the President acts in his personal discretion in the exercise of certain functions as a check on the Cabinet and Parliament of Singapore‚ his role is largely ceremonial. It is the Cabinet‚ composed of the Prime Minister and
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These soil forming factors continue to affect soils even on "stable" landscapes. Materials are deposited on their surface‚ and materials are blown or washed away from the surface. Additions‚ removals‚ and alterations are slow or rapid‚ depending on climate‚ landscape position‚ and biological activity. Parent material. Few soils weather directly from the underlying rock . These "residual" soils have the same general chemistry as the original rocks. More commonly‚ soils form in materials that have
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Study of Gold metal Date: 14/01/2013 Submitted to: Dr Sami Habib Submitted by: Jamil Mahfoud (A1010659) I- General introduction about metals: a- Historical background Back to 6000 BC‚ process metallurgy is known as one of the oldest applied sciences. Despite that the form of metals was very basic but it has a big impact on the society because of its wide uses especially as tools for agriculture or hunting and even as artistic styles later on. There are 86 known metals so far that were
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TOPIC 2 Metals The History of Metals * Uses of metals through history: * Copper Age (3200-2300 BCE) – copper and tin were most common metals‚ and were used for ornaments‚ weapons and tools. * Bronze Age (2300-700 BCE) – copper‚ tin and bronze were used for tools‚ weapons and transport. They produced bronze by heating copper and tin with charcoal. * Iron Age (1000 BCE – 1 CE) – iron steel and lead was used for tools‚ weapons and pipes. Iron is much harder than bronze.
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