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How is kostenecki synthesis of flavonoid used to identify and optimise flavonoid?
Photochemical chlorination of 2,2,4-trimethylpentane gives four isomeric monochlorides. Write the structural formulas for these for isomers. 1. Isomer with a primary chloride and the methyls at the lowest numbering
A 0.1276-g sample of a monoprotic acid (molar mass=1.10x10^2) was dissolved in 25.0 mL of water and titrated with .0633 M NaOH. After 10.0mL of base had been added, the pH was determined to be 5.77. What is the Ka for the acid
Consider what happens when a sample of the explosive TNT is detonated. (a) Is the detonation a spontaneous process (b) What is the sign of q for this process
The electrons in the neutral carbon atom are redistributed so that there are three lone electrons in the three 2p orbitals and one lone electron in the 2s orbital.
a 0.650 g steel sample containing mn was dissolved in acid anddiluted to 250 ml. a 50 ml aliquot was treated with kio4
Question- The number of polypeptides that can be formed from n amino acids is n!, n factorial, which is 1 • 2 • 3 • ... • n. How many polypeptides could b e formed from 4 amino acids? From 5? From 6?
The effective nuclear charge is approximated as the total nuclear charge minus the number of core electrons. Thus, effectively, core electrons decrease the nuclear charge felt by the valence electrons because they are between the nucleus and the v..
Use the Henderson-Hasselbalch equation to calculate the pH of a solution that is 14.5 g of HF and 23.0 g of NaF in 125 mL of solution.
If the pressure of 4.90L of an ideal gas in a flexible container is decreased to one-third of its original pressure, as well as its absolute temperature is reduced by one-half. Explain what is the final volume of the gas
The mass of the Earth's Moon is 7.35 x 10^22 kg. what is the mass expressed in megagrams , Mg?
Consider a solution formed by mixing 67.0 mL of 0.100 M H2SO4, 32.0 mL of 0.100 M HOCl, 25.0 mL of 0.200 M NaOH, 25.0 mL of 0.100 M Ca(OH)2, and 10.0 mL of 0.150 M KOH. Calculate the pH of this solution.
sample of this compound is combusted in excess oxygen and the products are 2.492 g of CO2 and 0.6495 g of H20. Determine the empirical formula of the active ingredient.
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