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Pani-rosa [81]
3 years ago
5

A solid and a liquid are shaken together in a test tube to produce a milky mixture that eventually separates into a clear liquid

and a white solid. which of the following best describes the mixture?
Chemistry
2 answers:
Vikentia [17]3 years ago
8 0

Answer:

milk and chele

Explanation:

lina2011 [118]3 years ago
6 0

the mixture is insoluble because it's heterogeneous mixture and they separate easily and it's mixed throughout so it's insoluble

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The activation energy for proline isomerization of a peptide depends on the identity of the preceding residue and obeys Arrheniu
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Answer:

Activation energy of phenylalanine-proline peptide is 66 kJ/mol.

Explanation:

According to Arrhenius equation-     k=Ae^{\frac{-E_{a}}{RT}}    , where k is rate constant, A is pre-exponential factor, E_{a} is activation energy, R is gas constant and T is temperature in kelvin scale.

As A is identical for both peptide therefore-

                                   \frac{k_{ala-pro}}{k_{phe-pro}}=e^\frac{[E_{a}^{phe-pro}-E_{a}^{ala-pro}]}{RT}

Here \frac{k_{ala-pro}}{k_{phe-pro}}=\frac{0.05}{0.005} , T = 298 K , R = 8.314 J/(mol.K) and E_{a}^{ala-pro}=60kJ/mol

So, \frac{0.05}{0.005}=e^{\frac{[E_{a}^{phe-pro}-(60000J/mol)]}{8.314J.mol^{-1}.K^{-1}\times 298K}}

   \Rightarrow E_{a}^{phe-pro}=65705J/mol=66kJ/mol (rounded off to two significant digit)

So, activation energy of phenylalanine-proline peptide is 66 kJ/mol

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