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An emerald gemstone is an impure form of the mineral beryl, Be3Al2Si16O18. What is the percentage of silicon in the mineral?
Organic chemistry solution - First question wants the product of certain oxidation reaction of chromic acid with a secondary alcohol and primary alcohol.
the electron in the n=5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
a couple drops of phenophalein indicator and then was titrated with 8.1mL of NaOH until it turned pink. what is the concentration of NaOH?
Explain why caffeine can be extracted from tea leaves into hot water, and how you extracted the aqueous solution and isolated crude caffeine
If 10.0mL of acetic acid, CH3COOH, is diluted with water to a total volume of 200.0mL, what is the percent by volume of acetic acid in the solution.
What are the factors that can influence the rate of a chemical reaction? 2- Why do the rates of most chemical reactions slow down over time?
calculate the potential of a platinium electrode immersed in a solution prepared by mixing 25.00ml of 0.0918 M SnCl2
A 5.00 L flask at 279 K contains a mixture of He and O2 with a total pressure of 1.00 atm. If the mole fraction of O2 is 0.40, what is the mass fraction of O2?
The structure for methyl orange in acid solution is not as simple as protonation of the amine nitrogen. In fact, protonation of one of the azo nitrogens occurs resulting in a new, conjugated system.
The Ksp of AgCl at 25 oC is 1.6 x 10-10. Consider a solution that is 1.0 x 10-3 M CaCl2 and 1.0 x 10-7 M AgNO3. 1. Ksp and a precipitate will not form.
Compute the typical thermal energy of a water molecule at normal conditions: (kB T) and compare it to the answer of the previous problem
If the molecular weight of a molecule is 180, how many grams would be required to make 100 milliliters of a 2 molar solution
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