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How would the Rf values change if you used pure dichloromethane ( no methanol ) as the mobile phase for the TLC separation of curcumin? What if you used pure methanol ( no dichloromethane)?
At 25 degrees Celsius the rate constant for the decomposition of a pesticide solution is 6.40e-3 min-1. If the starting concentration of pesticide is 0.0314M, what concentration will remain after 62.0min at 25 degrees Celsius
Write balanced equations of toulene, isopropylbenzene, ethylbenzene, t-butylbenzene with bromine in the presence of dichloromethane
Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32 P, how many grams will remain after 98.0 days?
baking soda (NaHCO3) can be made in large quantities by the following reaction: NaCl + NH3 + CO2 + H2O ---> NaHCO3 + NH4Cl If 9.41g of NaCl reacts with excesses of the other reactants and 3.81g of NaHCO3 is isolated, what is the percent yield of t..
Which of the following are ways that catalysts can speed up reactions rates? You must check all answers that apply.
What is the molarity of a 600mL solution prepared by dissolving 6.72 g of sulfuric acid, H2SO4
What is the mechanism of the synthesis of the dye para red from anilin?
Why is sodium bicarbonate used instread of sodium hydroxide for the initial extraction
Describe how you would make 2mL of the solutions that you described in the above using a 1.0 mg/mL solution of hemoglobin and a buffer to dilute it with.
A 74.0-mL sample of 0.13 M HNO2 (Ka = 4.0 × 10-4) is titrated with 0.14 M NaOH. What is the pH after 25.8 mL of NaOH has been added?
A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for this compound
You are fortunate to land a research position with Dr. Xavier Wray. Your first day in the lab the good doctor asks you to make a liter of 0.1 M citrate buffer pH 3.5 that you will need for the big extract procedure he will show you how to do after..
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