From the time of the Ancient Romans‚ through the Middle Ages‚ and until the late nineteenth century‚ it was generally accepted that life arose spontaneously from non-living matter. Such "spontaneous generation" appeared to occur primarily in decaying matter. For example‚ a seventeenth century idea for the spontaneous generation of mice required placing sweaty underwear and husks of wheat in an open-mouthed jar. Then‚ waiting for about 21 days‚ during which time it was said that the sweat from the underwear
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that only flies can produce more flies. Over time‚ the control jars were filled with maggots and flies. However‚ the experimental jars were free of insects. Demonstrates the maggots only appear if flies land on meat. (Eggs are laid) Disproves Spontaneous Generation. John Needham Meath Broth is boiled for several minutes to sterilize it. Broth is poured into two jars. One is sealed‚ the control‚ is left unsealed. Needham hypothesis that if life arises only from life‚ the heated broth
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The impacts on ’Spontaneous Consumer’ have resulted in the trend on Auckland Theatre Company. Impacts such as raising demands in the sales of tickets at the last minute. As inferred from the case study‚ “on average‚ 25-30 per cent of a season is booked in advance by subscribes. This may create loss of sales revenue from the particular group of ’Spontaneous Consumers’. However‚ Auckland Theatre Company may extend their registration dates to cater to this particular group’s needs. Extended registration
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Professor Department of Aerospace Engineering IIT Kanpur 13th July‚ 2012 ABSTRACT Numerical Studies of Microcombustion in a Micro-channel There are a lot of methods that converts chemical energy to thermal energy like fuel cells. But combustion is the most important one to obtain thermal energy from various fuels including hydrogen‚ natural gas‚ fuel oils because of its more energy output. Microcombustion is a potential energy source for small devices like unmanned vehicles and micro
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[ print page ] 04.05 Chemical Reactions: Combustion: Lab Worksheet and Rubric Before You Begin: You may either copy and paste this document into a word processing program of your choice or print this page. Procedure: 1. Iron (IIII) and copper (II) sulfate solution Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction. 2. Lead (II) nitrate and potassium iodide solutions Pour about 2.0 mL of lead (II) nitrate into
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Addition of carbon Combustion is the rapid burning of fossil fuels. Stored carbon in coal‚ oil and natural gas returns to the atmosphere when these fossil fuels are burnt and during natural combustion occurrences such as volcanic eruptions. Fossil Fuels such as coal are constructed when a living organism dies and decomposers‚ ie Fungi and microbes are unable to decompose it. After the organic material is untouched for millions of years‚ it eventually turns into fossil fuels. Petroleum‚ coal and
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EXPLOSIVES AND AIR BAGS a) Explosion reactions occur so quickly and are hard to control. Also explosion reactions usually release large amounts of heat and hot gases. Other reactions can be controlled by factors like temperature and concentration‚ but explosion reactions are hard to control. b) A certain amount of explosives is put in the end of the tube and then the cannonball is put on top. Then a match or lighter is used to ignite the explosives as the fire reacts with the explosives it blasts
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Combustion Of Alcohols Planning This investigation involves burning alcohol in the air. Key science- Chemistry by Eileen Ramsden says that " an alcohol is a series of organic‚ homologous compounds‚ with the general formula Cn H2n+1OH". The alcohol reacts with the oxygen in the air to form the products water and carbon dioxide: Cn H2n+1OH +(n+n/2)-1O2 ? nH2O + nCO2 The structure of the molecules in this reaction is: H H | | H - C - C - O- H + 3[O=O] ? 1/2[O=C=O] + 3[H-O-H] | | H H This reaction
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Describe the characteristics and explain the causes‚ of tsunamis. (8 marks) A Tsunami is a large and potentially destructive sea wave often produced by a submarine earthquake‚ subsidence or an underwater volcanic eruption. They occur when a large volume of water is displaced in the ocean. The characteristics of tsunamis differ slightly from normal sea waves. For one‚ they often have extremely long wave lengths‚ in deep water an initial wavelength can be up to 100km. Their amplitude contrasts with
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History of Explosives and Blasting In the US and Canada alone‚ blasters use more than 6 billion pounds of explosives and 75 million detonators per year. Coal mining accounts for two-thirds of consumed explosives of which more than 80% of it is ANFO. Today‚ sophisticated explosive materials and new technologies are being utilized to improve the quality of life for all of us. Computers are used to: drill‚ log and monitor blastholes — automate blending and delivery with bulk trucks — determine bench
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