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Suppose there's a crevice or deep hole in a river and all the minerals in the table above are bouncing along the stream's bottom. Heavy minerals will be deposited in the law areas but less dense material will be carried away by the flowing water. What materials would likely be found concentrated along with magnetite in placer deposits? Placer materials settle in holes or crevices at the bottom of the stream because of their higher density. Why should you care about this? Because many precious ores and metals are concentrated with magnetite along the irregular bottoms of streams- The California Rush was impelled by the discovery of placer gold at Sutter's Mill on the American River associated with 'black sand" (magnetite) deposits.
Which materials might be smelted in furnaces that reach a temperature of only 1100°C? Why should you care about this? Because early furnaces could attain temperatures near 1100oC and that only rarely, some ores could be dumped in a furnace but they'd just get hot and wouldn't melt. They might keep toes warm during a cold night but that was just about all they'd be good for.
If a flux that lowers the temperature of each of the above substances by 3003C, which additional materials can be melted in a furnace whose maximum temperature is Only 1100°C? Why should you care about this? Because it requires much less energy to melt something at a lower temperature. Hence people look for a substance (flux) that will lower the melting temperature of a desired substance.
How can you determine which substances would melt with such a flux? Take a hypothetical example. Suppose your table contained the mineral cuprite (a copper oxide) that has a melting temperature of 1235 °C. Obviously it wouldn't melt in a furnace whose temperature could only reach 1100°C. However, a flux which lowered the temperature of melting by 300T from 1235oC - 300oC a 935°C would melt cuprite in such furnace.
The compounds below cannot be identifed from IR and H NMR spectra alone. Explain. Suggest how other types of spectroscopy might be useful in solving the structure
Consider 2 Al + 6 HCl → 2 AlCl3 + 3 H2 , the reaction of Al with HCl to produce hydrogen gas. This reaction has a yield of 82.5 percent. How much HCl are needed to produce 14.0 L of H2 at 351 K and 1.11 atm
a tube containing hydrogen gas is attached to a device that supplies energy to the atoms. some of the atoms have
Draw the Newman projection formulas for CH3CHBrCH2CH3 and sketch the potential energy versus rotation diagram for a 360o rotation of 2-bromobutane along C2 and C3 carbon atoms.
Depict the correct stereochemical structures of these two compounds of the fumarase-catalyzed reaction. Be sure to comprise all hydrogen atoms as well as show the carboxylates as anions.
How many grams of NaCl would you add to a beaker before adding distilled water (Q.S.) to make 250 mL of an isotonic solution
What volume, in mL, of a hydrogen phosphate solution that is 85.5% hydrogen phosphate, by mass, contains 0.100 mole of hydrogen phosphate. The density of the solution is 1.70 g/mL.
The solubility of sodium chloride in water is 35.7 grams per 100 mL at 0 degrees celsius. What is the maximum amount of sodium chloride that will dissolve in 250 mL of water at 0 degrees celsius?
Nuclear fuel is U-235, an alpha emitter with a half-life of 703 million years. How long would it take for the amount of U-235 to reach one-sixteenth of its initial amount
what mass of hcl is contained in 30.0ml of a solution which is 37.2 mass hcl has a density of 1.19gml.determine what is
why differential pulse polarography is the most sensitive technique among the different modern types of polarography
If 525 mL of gas at 25 degrees is heated to 50 degrees at constant pressure, calculate the new volume of the sample gas.
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