"Metal detectors in schools" Essays and Research Papers

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    know how important a radar detector can be. These tiny devices can greatly reduce your chance of getting pulled over for speeding but do you know how they work? It is one of the technological advances that we seem to take for granted. Most of us have no clue beyond plugging them into the cigarette lighter and mounting them on the dashboard. But are they legal? How do they work? Those are just a few of the questions that you should have when it comes to radar detectors. This is your lucky day.

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    smoke detectors‚ not many have fire monitoring systems installed. Placing all your trust on smoke detectors is not always a good thing. Sometimes your smoke detectors may take a while to detect any smoke. Therefore‚ going for additional fire monitoring solutions can help protect your business even when smoke detectors malfunction.

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    Residential Smoke Detector Market in US 2014-2018 A smoke detector is a device that senses smoke as an indication of a possible fire‚ thus providing commercial and residential security. Smoke detectors are connected to an alarm system‚ which emits a high-pitched audio tone to warn residents in case of fire. The type of smoke detector to be used in residences varies on the specification of the residential buildings. Some residences may require battery-powered detectors‚ whereas others may need

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    Densities of Metal

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    Tony Nguyen Honors Chemistry Period 7 9/17/13 The Density of Metals Lab BACKROUND: Density is a constant relationship between the mass and volume of a specific type of matter. Measurements of both mass and volume can be obtained for a metal sample. The relationship can be shown graphically by plotting the volume of a sample on the horizontal x-axis and the mass of the sample along the vertical y-axis. Plotting the values for several samples‚ a linear relationship can be seen for a density (slope=density)

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    Importance of Metals

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    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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    Transition Metals

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    Transition Metals 1a) The d-orbitals of a free transition metal atom or ion are degenerate (all have the same energy.) However‚ when transition metals form coordination complexes‚ the d-orbitals of the metal interact with the electron cloud of the ligands in such a manner that the d-orbitals become non-degenerate (not all having the same energy.) The way in which the orbitals are split into different energy levels is dependent on the geometry of the complex. Crystal field theory can be used to predict

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    Alkali Metals

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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

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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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    Metal Fabrication

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    Metal fabrication is the building of metal structures by cutting‚ bending‚ and assembling processes: Cutting is done by sawing‚ shearing‚ or chiseling (all with manual and powered variants); torching with hand-held torches (such as oxy-fuel torches or plasma torches); and via numerical control (CNC) cutters (using a laser‚ mill bits‚ torch‚ or water jet). Bending is done by hammering (manual or powered) or via press brakes and similar tools. Modern metal fabricators utilize press brakes to either

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    Corrosion of Metals

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    Corrosion of Metals Introduction Have you ever had a bike that went rusty‚ figure 1? If the paint is scratched and the rust allowed to spread‚ it is very difficult to repair the frame so it looks as good as new again. Rusting costs us millions of pounds each year‚ either through replacing things or through trying to prevent it happening in the first place. Figure 1: Bike rusting. In this booklet you learn about rusting and ways of stopping it‚ followed by a look at another metal‚ aluminium that

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