around 5 - 5.5. Although pure water has a pH of 7‚ unpolluted rainwater has a pH of 5.6 – 6 because of carbon dioxide in the atmosphere reacting with the water and forming a weak carbonic acid. The acidity in the precipitations (rain‚ snow‚ fog) come from gasses released into the atmosphere by industrial factories‚ the combustion of fossil fuels‚ and even volcanoes. These gasses‚ sulfur dioxide and various nitrogen oxides‚ chemically react with the water vapors and oxygen in the atmosphere forming acidic
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Properties of Sulphur: In room temperature‚ sulphur is a yellow‚ brittle solid which doesn’t conduct electricity as it is a non-metal. Sulphur is insoluble in water. It is able to react with both metals and non-metals. Sulphur Dioxide: Sulphur dioxide is the product of combustion of sulphur or sulphur-containing fuels. As you have studied in the previous chapter‚ it is an air pollutant as it causes acid rain. However‚ SO2 has important uses too: Bleaching wood pulp for the manufacturing
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they give off smoke containing water vapor‚ carbon dioxide‚ sulphur dioxide and nitrogen compounds. The sulphur dioxide and nitrogen compounds cause small amounts of acid rain near the volcano. Pure water is not an acid‚ but even clean rainwater is slightly acidic. This is because it has carbon dioxide from the air dissolved in it. Rain is only called acid rain if it is more acid than normal. The main causes of acid rain are gases called sulphur dioxide (SO2)‚ and nitrogen oxides (Nox). These dissolve
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many sensitive forest soils. In addition‚ acid rain accelerates the decay of building materials and paints‚ including irreplaceable buildings‚ statues‚ and sculptures that are part of our nation’s cultural heritage. Prior to falling to the earth‚ sulfur dioxide (SO2) and nitrogen oxide (NOx) gases and their particulate matter derivatives—sulfates and nitrates—contribute to visibility degradation and harm public health. Acid rain causes acidification of lakes and streams and contributes to the damage
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efficient drying agent‚ taking up moisture from the air and even abstracting the elements of water from such compounds as sugar and starch. The concentrated acid also acts as a strong oxidizing agent. It reacts with most metals upon heating to produce sulfur dioxide. (McGraw-hill science and Technology encyclopedia) (http://www.answers.com/topic/sulfuric-acid#ixzz1oDQ9MJCN) If a person is exposed to the fumes‚ it could cause irritation to the skin and eyes‚ if the liquid touches the skin‚ it can burn
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living things and the environment is considered as air pollution. Air pollutant Carbon dioxide dioxide when they breathe‚ carbon dioxide is widely considered to be a pollutant when associated with cars‚ planes‚ power plants‚ and other human activities that involve the burning of fossil fuels such as gasoline and natural gas. In the past 150 years‚ such activities have pumped enough carbon dioxide into the atmosphere to raise its levels higher than they have been for hundreds of thousands
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sulphur‚ air and water 3. The Contact process consists of three stages. Stage 1: The production of sulphur dioxide This can be obtained by two methods: 1. Burning of sulphur in dry air in the furnace S + O SO2 2. Burning of metal sulphide such as zinc sulphide or iron(III) sulphide in dry air. 2ZnS + 3O2 2SO2 + 2ZnO Stage 2: Formation of sulphur trioxide In the converter‚ sulphur dioxide and excess oxygen gas are passed over a few plates of vanadium (V) oxide‚ V2O‚ the catalyst at 450°C to
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Carbohydrate Polymers 95 (2013) 530–539 Contents lists available at SciVerse ScienceDirect Carbohydrate Polymers journal homepage: www.elsevier.com/locate/carbpol In vivo evaluation of chitosan–PVP–titanium dioxide nanocomposite as wound dressing material D. Archana a ‚ Brijesh K. Singh a ‚ Joydeep Dutta b ‚ P.K. Dutta a‚∗ a b Department of Chemistry‚ Motilal Nehru National Institute of Technology‚ Allahabad 211004‚ India Department of Humanities and Applied Sciences‚ Institute
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rainfall is slightly acidic because carbon dioxide in the atmosphere dissolves in the raindrops to produce hydrogen ions. Yet‚ normal rainfall is not considered acid rain. Acid rain is a form of air pollution in which airborne acids produced by electric utility plants and other sources fall to Earth in distant regions. The corrosive nature of acid rain causes widespread damage to the environment. The problem begins with the production of sulfur dioxide and nitrogen oxides from the burning of fossil
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Diploma in Chemical and Pharmaceutical Technology (CLDF02) Nanyang Polytechnic Plant-based Project (PbP) Report Industrial Attachment at ExxonMobil Asia Pacific Private Limited [13th October 2008 – 13th February 2009] Name of Student : Ong Wei Suan Admin. Number : 062015X Module Group : CPT0605-B1 Name of Company : ExxonMobil Asia Pacific Private Limited Department : ExxonMobil S1 Operations Supervisor-in-charge : Mr Vignesvaran Swaminathar Liaison
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