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Chemistry Questions and Answers November 26, 2019

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What would the E (in eV) be for a molecule that had an absorption maximum at 700 nm? Give answer with 3 significant figures.

Triacylglycerol A contains 53% oleic acid, 29% linoleic acid, 9% palmitic acid, 4% stearic acid, 1% myristic acid and lesser amounts of other fatty acids. Triacylglycerol B contains 39% oleic acid, 29% palmitic acid, 24% stearic acid, 2% myristic acid, 2% linoleic acid, and lesser amounts of other fatty acids. Which of the two samples is expected

What is the mole of CO 2+ in a solution made up of 4 mL of 0.002 M solution of CO 2+ and 6 mL of 0.002 M solution of CN?

You have a solution of unknown concentration. You place this solution in your spectrometer and measure that it has an absorbance of 0.4 at 450 nm. The molar absorptivity of your product is 1500 L/moles-cm. Assuming that you measuring the sample in a 1cm path length cell what is the concentration of product in your solution? Report you answer in nM

Write the dissolution reactions of KCl(s) and CaCl2(s) in water.

Snake venom contains the enzyme phospholipase A2. The action of this phospholipase A2 cleaves the fatty acid tail from the position 2 of a phospholipid structure. Select a phospholipid and use it to illustrate the action of phospholipase A2 and discuss the structural ramifications of this reaction on the membrane.

b) Discuss the structural ramifications of this reaction on the membrane when phospholipase A is present at high concentrations. Consider the 3dimensional structures formed by both the reactants and the products and the functions of both of these structures. (10 points)

c) Steroids are used to treat snake bites. What would be the effect of phospholipase A2 on membrane cholesterol Why (5 points)

A 100.0 mL sample of water contains Mg 2+ and Ca 2+ . The first sample is titrated with 15.28 mL of 0.0016 M EDTA in pH 10 ammonium buffer. Another 100.0 mL sample is treated with NaOH to precipitate out the magnesium hydroxide and titrated in pH 13 buffer with 10.43 mL of the same EDTA solution. Calculate the ppm of CaCO 3 and MgCO 3 .