Research A phase change is when a substance changes from one state of matter to another. In my experiment I will be freezing water that will turn into ice and see what chemical reaction does different types of salt have on the ice. Salt melts ice mainly because adding salt lowers the freezing point of the water. Pure water freezes at 32°F (0°C). Water with salt (or any other substance in it) will freeze at some lower temperature. The normal freezing point of water is 0 degrees Celsius‚ so if the
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Available online at www.sciencedirect.com Chinese Chemical Letters 20 (2009) 889–892 www.elsevier.com/locate/cclet Highly selective CO methanation over amorphous Ni–Ru–B/ZrO2 catalyst Qi Hai Liu‚ Xin Fa Dong *‚ Wei Ming Lin School of Chemistry and Chemical Engineering‚ South China University of Technology‚ Guangzhou 510640‚ China Received 15 December 2008 Abstract Amorphous Ni–Ru–B/ZrO2 catalyst was prepared by the means of chemical reduction‚ and selective CO methanation as a strategy
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| Melting point/℃ | Boiling point /℃ | Before adding impurity (salt) | 2 | | After adding impurity (salt) | -10 | 107 | Conclusion: As shown from the result table‚ the temperature of the ice without any impurity is at 2 ℃. Ice is the solid state of water. For ice‚ the melting point is O℃ that means the ice already started to melt at 2℃. However‚ after adding the impurity (salt) to the ice‚ the temperature suddenly decreased to -10℃. This suggests that by adding salt to ice‚ the temperature
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removed. This step was repeated and the water was removed again. CaCl2 pellets were added to DCM solution until it longer clumped. The solution was filtered to separted the CaCl2 pellets from DCM. DCM was used to wash pellets before filtering. To the solid in bottom of flask‚ (3ml) of propanol was added‚ heated and cooled. Filteration was tried once more to gain crystals. Due to nonexistent crystals a melting point could not be performed. Observations: We noticed after adding
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degrees Celsius is reached. After that‚ it expands slightly until it reaches the freezing point‚ and then when it freezes it expands by approximately 9%.Solidification‚ also known as freezing‚ is a phase change of matter that results in production of a solid. Generally‚ this occurs when the temperature of a liquid is lowered below its freezing point. Frozen soda can explosions are not due directly to water expanding as it freezes‚ but to the resulting pressure put on an isolated pocket of C02. A boy in
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atoms may be free to move‚ the delocalisation remains in force until the metal boils. Why are metals malleable and ductile? The malleability and ductility of metals are possible because metallic bonding is the same in all directions throughout the solid. One plane of atoms in a metal can slide past another without encountering any resistance or breaking any bonds. Metals are described as malleable (can be beaten into sheets) and ductile (can be pulled out into wires). This is because of the ability
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Compare and contrast magnetic tapes‚ magnetic disks‚ optical discs‚ Flash RAM‚ and solid-state drives (SSD) in terms of: a. Speed b. Volatility c. Access methods d. Portability e. Cost f. Capacity A magnetic tape is a data storage device which typically stores digital information. The magnetic tape uses digital recording methods and is shaped as a cassette or a cartridge. The tape driver is a device that records the data on to the magnetic tape. Typically‚ the speed of the magnetic depends
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Effect of Temperature on Polymers: Solids on heating eventually melt to form a liquid. With polymers it is not so simple rubber on cooling (in liquid nitrogen) becomes brittle or glassy. Many polymers have a mixture of ordered (crystalline) regions and random (amorphous) regions. In the glassy state‚ the tangled chains in the amorphous region are frozen so movement of chains is not possible the polymer is brittle. If the glassy material is heated‚ the chains reach a temperature at which they
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PrFan Blades Rolls Royce is unique for its patented manufacturing process of its hollow wide-chord titanium fan blades. To make these fan blades light and strong the fan blades are made from titanium 6-4 alloy with a hollow internal “Warren–Girder” structure. This is done using 2 processes namely Superplastic forming and Diffusion bonding. The manufacture process starts with 3 sheets of forged titanium. A material called stop-off is printed onto 2 of the sheets which will stop them from joining
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Recrystallization of Methyl 3-nitrobenzoate Santiago Horta‚ Daniella I School of Chemistry and Biochemistry‚ Georgia Institute of Technology Atlanta‚ GA 30332 Submitted: 18 February 2015 In this experiment‚ the product of a nitration will be purified by recrystallization using a selected solvent. Methyl benzoate is treated with nitric acid and sulfuric acid to obtain methyl 3-benzoate‚ which will be mixed with a solvent that will dissolve the product at its boiling temperature but not at
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