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In the dehydration experiment, several ml of saturated sodium chloride is used to transfer crude product after the initial distillation. Why is saturated sodium chloride, rather than pure water, used for this experiment.
The activation energy for a particular reaction is 95 kJ/mol. By what factor will the rate constant increase when the temperature is increased from 50 oC to 62 oC?
which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6 At 23C
A stock solution is prepared by adding 21 mL of 1 M AlCl3 to enough water to make 76 mL. What is the Cl- concentration of 40 mL of the stock solution?
Copper(II) iodate precipitates from iodate solution. The formula of the precipitate is CU(IO3)2. A saturated solution of this substance was made in 0.01 M KIO3.
that the reaction was endothermic. If the enthalpy of reaction is negative, then we say that energy was released or that the reaction was exothermic. Most chemical reactions are exothermic.
Find the pH and volume (mL) of 0.447 M HNO3 needed to reach the equivalence point(s) in titrations of each of the following
propose a mechanism for the conversion of glucose 6-phosphate into fructose 6-phosphate by phosphoglucose isomerase based on the mechanism
Calculate the molarity of the 25.0 mL sample of 0.100 acetic acid which was diluted with 25.00 mL H2O
The amount of calcium in a 15.0-g sample was determined by converting the calcium to calcium oxalate, CaC2O4. The CaC2O4 weighed 12.8 g. What is the percent of calcium in the original sample
As a technician in a large pharmaceutical research firm, you need to produce 350.mL of 1.00 M potassium phosphate buffer solution of pH = 6.87. The pKa of H2PO4- is 7.21.
A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 0.700fg (where a femtogram, fg, is 10?15g) and is swimming at a velocity of v = 2.00?m/s , with an uncertainty in the velocity of 8.00 %
When optically active propylene oxide is used, the 1,2-diol obtained from the acid hydrolysis has a optical rotation opposite from the Alkaline hydrolysis. Write the mechanism of each hydrolysis that is likely to explain these facts.
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