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2 components mixture give the tlc shown when 1:1 mixture of hexanes:ethyl acetate is used as the developing solvent which components is more polar and how can you tell? draw a sketch of a possible tlc if acetone was used as the developing solvent
Explain why magnetic metals are found only among the 3d and 4f elements. Why are Sc and Ti, which are also 3d elements, diamagnetic?
Perform the following mathematical operations, and express each result to the correct number of significant figures. 0.19*6.022*10^23
A biochemist is trying to purify the enzyme hexokinase from a bacterium that normally grows in the Arctic Ocean at 5C. In the next lab
A white precipitate formed when the barium hydroxide solution was mixed with the sulphuric acid. *Mass of filter paper=0.96g *Mass of filter paper and precipitate=5.25g
The compound As2I4 is synthesized by reaction of arsenic metal with arsenic triiodide. If a solid cubic block of arsenic (d 5.72 g/cm3) that is 3.03 cm on edge is allowed to react
The values of delta h and delta s for the reaction CaCo3(s) yields CaO(s)+CO2(g) are 177.8kJ and 160.5 J/K respectively. the pressure of CO2 at equilibrium for the process
Raw milk sours in 4.0 hours at 28 degrees celcius but takes 48 hours to sour in a refrigerator at 5 degrees celcius. Calculate the activation energy for the souring of milk?
Write a balanced equation for the reaction of 2-octanol and surphuric acid. what products are formed?
Consider the change in entropy change that occurs when a box of coins that contains a perfectly ordered array of three moles of coins is shaken. Calculate the entropy of the ordered coins, and then calculate the entropy after the box has been shak..
a sample of 0.600 moles of metal M reacts completely with excess of flourine to form 46.8g of MF2. How many moles of F are present in sample of MF2 that forms?
A student standardized her I2 solution by preparing a solution of 0.0450 g of ascorbic acid (vitamin C) in a 100 mL volumetric flask. She titrated several 10.00 mL samples of the Vitamin C solution and found an average of 24.95 mL of I2 solution
In a titration, 25.0 mL of 0.154 M HCl was added to 45.0 mL of 0.213 M ammonia (NH3). What is the pH at this point? (Kb of NH3 = 1.8 × 10-5 )
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