Controlled assessment- How concentration affects the rate of reaction between sodium thiosulfate and hydrochloric acid. SA): Strategy Scientific knowledge Sodium thiosulfate (Na2S2O3)‚ also spelled sodium thiosulphate‚ is a colourless crystalline compound that is more familiar as the pentahydrate‚Na2S2O3·5H2O‚ an efflorescent‚ monoclinic crystalline substance also called sodium hyposulfite or “hypo.” Sodium thiosulphate has a melting point of 48 degrees C. It is freely soluble in water. It contains
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Behavioral Problems in Children Dealing with toddlers‚ preschoolers and school-aged children can leave a parent feeling stressed out‚ tired‚ and frustrated. Over the past several years‚ a number of studies have shown a rise in behavior problems among children. Behavioral problems among children‚ parents seem to have a hard time controlling their children. There is a behavioral problem such as physical and verbal aggression‚ disruptive destruction‚ self-injury and noncompliance. Challenging behaviors
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that could be handled out by law. Unitarian approach The Unitarian approach optimizes the benefits for the greatest number of people. This would include establishing a conflict free workplace as possible. This can be accomplished if the managers and worker’s objectives are in agreement with each other. This approach is not feasible in today’s fast growing and complex business world. (Study Mode 2014)
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Solar Energy Essay Fossil fuel comes from the earth‚ from the decomposition of dead living things underground. Fossil fuel is easy to get and is cheap‚ but fossil fuel takes millions of years to form and is not a renewable energy and it contains a large amount of carbon in it. There are some types of fossil fuel like; coal‚ natural gas and petroleum. Fossil Fuel makes electricity‚ motor oils and other things that are used in our daily lives. When fossil fuels are burnt‚ they produce heat‚ which
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Is it characters‚ the storyline‚ or overall message that makes a movie great? There have been numerous movies made‚ but just a few have had a sincere impact on people. A Girl Like Me: The Gwen Araujo Story did just that. It is about a transgender teenage and his amazing journey to self discovery to live life as a woman. It is a true based television movie the premiere in 2006 on Lifetime Movie Network. It is starring JD Pardo as the main character Eddie/Gwen Araujo and Mercedes Ruehl as his mother
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Effects of Water Pollutions Water is important for the existence of life on earth. All organisms require it and aquatic plants and animals live their life in water. Water pollution occurs when you have toxins and pathogens present in water in dangerous amounts than permissible. One of the worst forms of pollution in the ecosystem is water pollution. When you hold a glass of water it may appear to be clean and clear. But the fact is there are millions of microscopic pollutants suspended
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Combustion of Alcohols Purpose: The purpose of this investigation is to use calorimetry to determine the molar enthalpy change in the combustion of each of a series of alcohols. Question: How do the enthalpies of combustion change as the alcohol molecules become larger? Prediction: I predict the bigger the molecule the more the energy will be released. Materials: On lab sheet Procedure: On lab sheet Observation: On other page Analysis: b) i) Ethanol – q=(100g)(4.18J/g/C)(25.5C) q=10659J
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Into thin Air by Jon Krakauer Research Topics Hypoxia “At 29‚028 feet up in the troposphere‚ so little oxygen was reaching my brain that my mental capacity was that of a slow child” (6). Lesser Peaks “To the South‚ where the sky had been perfectly clear just an hour earlier‚ a blanket of clouds now hid Purmori‚ Ama Dablam‚ and other lesser peaks surrounding Everest” (6). Oxygen Tanks “Wanting to conserve what-ever oxygen remained in the tank‚ I asked him to reach inside my backpack and
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WATER QUALITY AND CONTINMINANTION Introduction I. Body Paragraph #1 – Background~ Water quality is decided by assessing three classes of attributes: biological‚ chemical‚ and physical. There are criteria of water quality set for each of these three categories of properties. The standards for drinking water are developed by the Environmental Protection Agency (EPA)‚ World Health Organization (WHO) etc. All municipal (public) water supplies must be measured against these standards. Testing how
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Self Heating Food and Drink Cans Heater meals – originally developed for military use – are ready-made self-heating meal packs. They can be heated in many ways – by pressing a button on the packaging‚ unwrapping and shaking the pack‚ or pouring the contents of one bag into another and waiting for a few minutes – all of which use exothermic chemical reactions. These meals can be used to motivate students to study such reactions relatively safely and without the use of a burner. Plus there is the
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