such as nitrogen and sulfur oxides‚ that is unusually acidic‚ meaning that it possesses elevated levels of hydrogen ions (low pH). Acid rain is also called acid deposition because this term includes other forms of acidic precipitation such as snow. The acid deposition is occurs in two way which is wet deposition and dry deposition. It can have harmful effects on plants‚ aquatic animals‚ and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide‚ which react in the atmosphere
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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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prototype nanometer-scale generator that produces continuous direct-current electricity by harvesting mechanical energy from such environmental sources as ultrasonic waves‚ mechanical vibration or blood flow. Based on arrays of vertically-aligned zinc oxide nanowires that move inside a novel “zig-zag” plate electrode‚ the nanogenerators could provide a new way to power nanoscale devices without batteries or other external power sources. The Nanogenerator is constructed with an electrode lowered
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pollutants such as carbon monoxide‚ nitrogen oxides‚ sulfur oxides and hydrocarbons are produced as fossil fuels are used (Union of Concerned Scientist‚ n. d.). Carbon monoxide causes headaches and aggravates people with heart disease. Nitrogen dioxide and nitric oxides create smog‚ a yellowish-brown “cloud” layer that settles on the ground. And these substances irritate lungs causing issues like bronchitis and pneumonia. Sulfur oxides and nitrogen oxides are the primary components of acid rain and
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acidic with pH 6.5 but we call it acid rain when it is pH is between 2 and 5.5. It is formed by chemicals created by the burning of fossil fuels‚ power plants‚ factories and auto mobiles. These chemicals are sulfur dioxide and nitric oxide. Sulphur dioxide and nitric oxide react with water in the atmosphere and eventually fall back to earth’s surface as an acid deposition. Shanghai is a city which is located on eastern coast of China. It is a strong commercial and industrial base city in China. Most
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distress and even oral health impairment. The article I chose conducted twenty-two random dental treatments and tried to reduce the anxiety in the adult patients. Different forms of cognitive-behavioral therapy‚ music distraction‚ acupuncture‚ nitrous oxide sedation‚ lavender oil scent‚ and relaxation therapy were the types of anxiety relief that they used in this trial. Cognitive-behavioral therapy is based on the importance of thinking in how we feel and what we do. Music distraction is used often in
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IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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malachite and etc. According to the technical conditions of smelting‚ the copper ore can be divided into three classes based on the proportion of copper oxide and copper sulphide‚ that is‚ sulfide ore‚ which contains less than 10% copper oxide；oxidized ore‚ which contains more than 30% copper oxide; mixed ore‚ which contains 10%~30% copper oxide. Copper is one of earliest metals that be found and used by human beings‚ it is aubergine‚ with the specific gravity of 8.89‚ and melting point of 1083
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up and created a new gas‚ nitrous oxide. This caused him to see clearer while feeling lightheaded‚ but this happened totally by accident. Nitrous oxide is commonly referred to as laughing gas because Priestly could not stop laughing when the gas was in his system. Nitrous oxide was then tested on Humphry Davy‚ who was the first patient to receive nitrous oxide while having his wisdom teeth removed. He felt no pain‚ and it was a success (Poetry). Nitrous oxide did not have the strength to relieve
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| | | | Some Group IVA Elements | | | | C | Solid | Black | Crystalized | NotApplicable | Sn | Solid | Silver | Metal | | Si | Solid | White | Powder | | Pb | Solid | Gray | Plate-like | | | | | | | Some Group IIA Metal Oxides | | | | | | Reaction toBlue Litmus Paper | Reaction toRed Litmus Paper | | | | | MgO | Insoluble | No Reaction | Turned to Blue | CaO | Insoluble | No Reaction | Turned to Blue | DATA & RESULTS According to the data and information
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