GAS WELDING Gas welding is a process that use fuel gases and oxygen to weld and cut metals. Uses: 1-welding and cutting metals 2-in Stone Work for flaming 3-in the glass industry for fire polishing 4-in jewelry production How we use it : The apparatus used in gas welding consists basically of an oxygen source and a fuel gas source it’s pumped through hoses and get out to cut or weld the used metal and there are two cylinders one of them contain oxygen and we can control
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the earth is hopeless. However water pollution must be stooped because the water is more important than anything. We can survive without oil or gold but we can’t survive without water. We need water for everything. The Greek philosopher Plato said: ”Water is something most needed for sustain life‚ and that easily destroyed. It is therefore a need protective law" . His statement is not lost actually. Even Plato in 2500 B.C was writing about the water pollution and how we influence over our life
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and think carefully in a quiet place. Noise Pollution can be defined as unwanted or offensive sound that unreasonably intrude into our daily activities. In urban areas noise pollution is everywhere‚ whether we like it or not this is part of everyday life. If the ears was irritated to the sound it is called noise. This is defined a form of air pollution that is audible unwanted sound that poses a threat to a person’s health and well- being. This pollution has many sources from different things such
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Appendix APPENDIX 1 Chemical tests for functional groups Homologous series/ Typical compound Functional group(s) Alkanes CH3CH3 ethane C – C and C–H Alkenes CH2 = CH2 ethene C=C Chemical tests/Observations Add liquid bromine in ultraviolet light (or sunlight): White fumes of HBr liberated; decolourisation of bromine occurs slowly (a) Add Br2 in CCl4 at room temperature: Decolourisation of bromine occurs immediately CH2 = CH2 + Br2 → CH2BrCH2Br (b) Add acidified
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increase amount of some gases due to human‚ environmental and industrial activities. The introduction of chemicals‚ particulate matter‚ or biological materials that cause harm or discomfort to humans or other living organisms‚ or cause damage to the natural environment or built environment‚ into the atmosphere‚ is called Air Pollution. The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planet Earth. Air pollution threatens our lives. In the major cities
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Topic 6 Microscopic World II Unit 23 Shapes of molecules Unit 24 Bond polarity and intermolecular forces Key C o ncepts Microscopic World II Shapes of molecules • Covalent molecules with non-octet structures • Shapes of molecules • The VSEPR theory • Molecular crystals of buckminsterfullerene (C60) • Carbon nanotubes Bond polarity and intermolecular forces • Electronegativity and bond polarity • Van der Waals’ forces • Factors affecting the strength
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BOOK R E V I E W S Environmental Politics and Policy‚ 6th Edition. Walter A. Rosenbaum. 2005. CQ Press‚ Washington‚ DC. 366 pp. $44.95 paperback. Reviewed by Joel T. Heinen‚ Associate Professor‚ Department of Environmental Studies‚ Florida International University‚ Miami‚ FL 33199 The Sixth Edition of Walter A. Rosenbaum’s much-used volume is a necessary update for several reasons‚ not the least of which is the insight provided throughout on the environmental policy impacts of the G. W
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Assess the role of social and economic groupings of nations in the world today. (40 marks) Social and economic groupings can provide substantial benefits for their members: political unity and strength‚ greater economic security‚ and wider cultural integration. It is therefore unsurprising that many countries seek membership to these organisations. However some economists note that there can often be clear power disparities between their members‚ and inequalities in the actual benefit gained from
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Chemist 1: New product development This career role involves the development of new paints to meet changing market needs. The chemist would be working as a member of a team developing and testing new colloidal paints to suit specific purposes. This might include weatherproof paints‚ which retain their colour and are resistant to solar radiation‚ or indoor paints that can be easily and repeatedly washed. Chemist 2: Environmental monitoring This career role as a public servant could involve monitoring
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MARINE POLLUTION By: Naveen Prasad Yerra subbarayudu AGENDA • Introduction • Types of pollution Cause Effects INTRODUCTION • Harmful foreign contaminates entry in to ocean like chemicals‚ particles‚ industrial‚ agricultural and residential waste‚ noise. • Creates a disturbance in the ocean chain • Major portion of marine pollution are land based TYPES OF MARINE POLLUTIONS Pollutants Entering The Oceans 3% 10% 20% Air Pollution Farm Runoff Litter Sewage 5% 20% 10% Offshore
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