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patricialovett4393

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13--> (a) A cottage is a small closed place and burning of propane decrease the amount of oxygen in that small place continuously. Burning of propane produce a toxic gas called carbon monoxide whose continuous inhalation during sleep can kill a person. So, the cottager died due to continuous inhalation of toxic carbon monoxide gas gas during sleep. (b) We have all seen clouds of black smoke emanating from the exhaust stacks of heavy duty diesel trucks especially when the truck is under high load or hard acceleration. The black smoke is composed primarily of elemental carbon from incomplete combustion of diesel fuel and traces of engine lubricant. The exhaust of a typical diesel engine contains elemental carbon (soot), semi-volatile organic hydrocarbons, sulfates (primarily sulfuric acid), and water vapor. Elemental carbon which is black is formed for a wide range of reasons when the diesel fuel charge in the combustion cylinder is incompletely combusted. Incomplete combustion occurs and soot is formed when there is an overabundance of fuel (both diesel fuel and lube oil), insufficient residence time in the combustion zone, and/or non-availability of sufficient oxidants. (c)A Bunsen burner flame produces energy from burning gas. > If the air hole is open the flame burns in plenty of oxygen. Combustion is complete and a blue flame is seen. This means there is more energy released. > If the air hole is closed there is a shortage of oxygen. Combustion is incomplete and less energy is transferred. A blue flame from a Bunsen burner transfers more energy than a yellow Bunsen flame as complete combustion gives a blue flame. Incomplete combustion gives a yellow flame and so less energy is released. When combustion is incomplete, a yellow flame is seen. This is because a yellow flame produces a lot of soot. Carbon monoxide, soot and water vapour are produced as well as carbon dioxide. Before adjustment of bunseen burner , air hole was not completely opened and producing yellow flame due to incomplete combustion in less supply of oxygen but after adjusting bunseen burner, air hole is completely opened and produce blue flame due to complete combustion in excess supply of oxygen.
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