The thermal decomposition of nitrates – ‘writing with fire’ 31 A message is written on filter paper with a solution of sodium nitrate and is then dried‚ rendering it invisible. Applying a glowing splint to the start of the message makes the treated paper smoulder and the message is revealed as the glow spreads its way through the treated paper. Lesson organisation The demonstration takes about 10 -15 minutes. It could be a student activity‚ but with a large class it will need a well
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Other nitrogen containing compounds Catecholamine: Dopamine‚ norepinephrine (noradrenaline) and epinephrine (adrenaline) are biologically active amines and are collectively called as Catecholamine. * Dopamine and norepinephrine functions as neurotransmitters. Outside the nervous system‚ norepinephrine and its methylated derivative‚ epinephrine regulates carbohydrate and lipid metabolism. They are released from storage vehicles in the adrenal medulla in response to stress (fright‚ exercise‚ cold
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fact‚ according to Steven and Susan Zumdahl‚ Antoine Lavoisier‚ a French Chemist‚ performed thousands of combustion experiments and measured masses of every single reactant and product‚ including those which were gases (for example‚ Carbon Dioxide‚ Nitrogen‚ Hydrogen‚ and Oxygen). Lavoisier considered measurements to be an essential tool for chemistry. He observed that as the physical and chemical properties of the products and the reactants differed‚ the total mass of the products was always the same
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REPORT ON ‘CASH MANAGEMENT’ In NATIONAL FERTILIZERS LIMITED RESEARCH METHODOLOGY The methodology used for carrying out this project is as follows: ➢ Studying the annual accounts of the company for obtaining related financial data. ➢ Studying the accounting records and arrangements with the consortium of banks‚ Commercial paper‚ working capital demand loan (WCDL)‚ FDRs and short term
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Experimental Determination of the Formula of Magnesium Oxide. Introduction: Magnesium is a mental‚ it is known to react with oxygen. Magnesium reacts vigorously when heated in the presence of air‚ which is why we have chosen high heat in our method to facilitate combustion. This oxidation reaction produces magnesium oxide gaining oxygen from the air. When sharing of electrons occur a chemical bond is made and the atoms combine to form a molecule. So‚ the predicted molecular formula:
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Gravimetric determination of sulphate in fertiliser Question: The proportion of sulphate present in a brand of commercial fertiliser under a range of temperatures. Fertilisers provide plants with a number of sources necessary for them to grow‚ as follows‚ nitrogen‚ phosphorus‚ potassium and finally the one I will be concentrating on Sulfur. To cater for the varying plants‚ you wouldn’t require all these elements to the same extent as the necessities for each plant differ. The composition of different fertilisers
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The Chemistry of Decomposition Decomposition is defined as the biological and chemical changes a body undergoes after death. It is the decay of tissues and structures. There are two types of decomposition: abiotic and biotic. Abiotic decomposition is defined as the degradation of a substance by chemical or physical processes; such as hydrolysis‚ reduction‚ or oxidation. Biotic decomposition is the metabolic breakdown of materials into simpler components by living organisms. This is typically
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absorption losses‚ compared to other metals. The formation of silver nanoparticles is done by depositing of various mass thickness of uniform layer of silver at the rate approximately 2 Å/ s at 1x10−5 Torr. After this‚ the sample were annealed in nitrogen for 50 min at 200 °C. The particle coalesce together to formed island due to surface tension. In this experiment‚ four samples were used‚ a) 1.25 µm SOI Test Cells – The thickness layer of SOI devices is to be 1248 nm for silicon layer and 1000 nm
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a) Identify the major variables that you controlled or measured in this investigation. What type of relationship do these variables have with each other? The variable that we manipulated was the fuel to oxygen ratio and the variable that we observed was how efficiently the fuel burned in each of the mixtures. The efficiency of the combustion depended on the fuel to oxygen ratio. If mixture was fuel lean the combustion reaction would produce less soot and smoke. If the mixture was fuel rich‚ an incomplete
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Oxygen (1770s) [pic] British educator and philosopher Joseph Priestley (1733 – 1804) discovered oxygen in experiments‚ isolated the gas‚ and described its function in combustion and respiration. He also invented soda or carbonated water by dissolving fixed air with water. Unaware of the significance of his discoveries and because of his stubborn refusal to abandon the phlogiston theory‚ he named the new gas “dephlogisticated air.” However‚ it would be the French chemist Antoine Lavoisier (1743
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