AgCl to form instead of the desired solid PbCl2. The mixture was then centrifuged in order to let the solid particles of the three ions to fall to the bottom. Another drop of HCl was added to test if the reaction had been completed. If the solution were to turn milky white again then it would’ve signaled an incomplete reaction between the cations and HCl. The next objective was to separate the lead(II) ion from the mixture. The test tube with all three solids precipitated at the bottom was heated
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determined by observing its crystals and finding its melting point. The melting point is usually expressed as a range. The first number is the temperature at which melting is first observed and the second number is the temperature at which the solid is completely melted. Pure substances will have a higher melting point and a narrower melting point range closer to the literature value versus impure substances which will have a lower melting point and a larger range. The literature melting
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MME 3210 Materials Processing Techniques Laboratory Assignment – Sand Casting of an Aluminium 13wt% Silicon Alloy 1) Process Attributes Waste shown yellow* Waste shown yellow* After taking part in the sand casting laboratory session it was made clear that the process possessed many advantages and disadvantage‚ both from the process itself and from the final part produced. Observing the process step by step it was noted that the tasks carried out by the operator were not very difficult
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were to be answered in experiment 2. The equation of this reaction is as follows (and is the same as that found in experiment 2):  During this experiment‚ we used recrystallization methods in order to help in the purification of the unknown solid‚ as well as drying and vacuum filtration. We then ground the unknown and combined it with different chemicals (such as acetanilide or phenacetin) and used the melting point ranges to determine the identity. We used the Mel-Temp method in order to measure
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by ionic bonds. Most ionic compounds are crystalline solids at room temperature. An ionic compound consists of a three-dimensional lattice (network) of ions held together by ionic bonds‚ which extend throughout the whole crystal structure. Ionic Compounds have high melting and boiling points because of the electrostatic bonds throughout their crystal lattice. Electrons are held firmly in ions so they are bad conductors of electricity when solid. When molten‚ the ion vibration and causes breaks in
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element alloy is far greater than R‚ hence the name high entropy alloys has been given(Since‚ high entropy alloys usually has at least 5 elements). Stability: High entropy alloys derive their strength by formation of random solid solution with a simple structure. But solid solution is not always formed. Sometimes the alloy can
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Yield Data The reaction of 0.139 grams of trans-cinnamic acid‚ 0.8 mL of glacial acetic acid‚ and 1.0 mL of 1.0 M of Bromine in acetic acid was recrystallized to form a solid‚ clear‚ crystal- like product. The melting was taken from the recrystallized product to determine what had been obtained. The melting point was found to be 130.5°C-133.7°C. Concluding that the product formed from the addition of bromine was a mixture of the erythro-2‚ 3-dibromo-3-phenylpropanoic acid‚ which has a known melting
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lowered‚ is due to the fact that the mixture of the two components has caused the structure of the solid to change and become less organized (not as strong). Therefore causing the mixture to melt at a lower temperature. The melting point is broadened because the mixture has more than one component present; which means it will take a longer period of time to melt‚ because there will be more than one solid structure to break down‚ therefore broadening the melting point of the mixture. Compared to the
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process with technical specifications‚ types and more. Oil Filter Press Filter Presses are used to filter the extracted oil from all kinds of Disc vacuum filter impure substances. They are used for clarification of oil as well as collection of solids or precipitates. Filter presses are used to filter and purify all types of liquids from impurities. Filtered oil is considered to be completely pure and fresh and good for health benefits. After the filtration process of oil is done‚ refining
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Abstract Christy Light Period 2 “Comparing the Coolant Effects of Dry Ice and Ice” What we learned in this lab is how to compare the abilities of dry ice and solid water to act as heat absorbers. This mean that we had to compare which substance had the better result of absorbing more heat. We also learned to determine which substance was the most cost effective. We also learned how to determine the amount of heat each substance absorbed and compare which one absorbed the most heat. The first
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