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chemistry
may 2021
18

Chemistry Questions and Answers May 18, 2021

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Calculate the grams of barium chloride dihydrate required to prepare 2.00L of barium chloride 0.1080 M. Then describe how you prepared the solution. After, calculate the % (w/v) of Ba 2+ in the solution.

For a selfcomplementary DNA oligonucleotide, the melting temperature is monitored as a function of total strand concentration T(K) Strand 315 318 321 5.00 X 9.00 X 1.50 X Concentration (M) 105 105 104 324 2.70 X 10 327 4.00 X 104 329 8.20 X 104 332 1.40 X 103 Determine the enthalpy and entropy changes associated with the melting of this DNA

What changes do you think take place as the color changes upon the addition of phenol, pyrogallol or catechol and guaiac solution to the potato extract?

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