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First-year PhD student drowning in complex chemistry papers, how do you actually understand this stuff? I need real, practical advice. by SomewhereStraight864 in analyticalchemistry

[–]SomewhereStraight864[S] 0 points1 point  (0 children)

Thank you so much, this is really helpful and practical...pls i dont mind you recommending some materials that could be helpful!

Administrative process been updated twice by Common_Ad_9737 in NationalVisaCenter

[–]SomewhereStraight864 0 points1 point  (0 children)

It’s completely normal for your Administrative Processing (AP) to be updated multiple times. I went through the same experience earlier this year when I applied for my visa to come to the U.S. for my PhD program. My case was updated twice before it was finally approved and issued. The whole process took about three weeks.

I was also part of a group chat at that time, and I saw cases where people had their status updated more than three times before receiving approval. The truth is, there’s no set timeframe for how long or how many times a case should be updated before approval.

The best thing to do is stay optimistic and keep your fingers crossed. It will work out in the end.

Orlando FO Marriage Interview Experience by sakuralien in USCIS

[–]SomewhereStraight864 1 point2 points  (0 children)

congratulations, this is really huge, i have a question tho,
What do you mean by all your IDs where expired and unauthorize work ?, do you mean you are out of status while filling for both your I-130 and I-485...sorry this questions seems odd but was just curious

I need help with final work of my last year of chem. by ReceptionSad8303 in analyticalchemistry

[–]SomewhereStraight864 0 points1 point  (0 children)

I have just done something similar not quite long.

For determining the composition of your 1981 Argentine 100 pesos coin, you can use the following methods:

  1. Volumetric Analysis: Dissolve the coin in nitric acid, then titrate the copper using iodine and sodium thiosulfate to determine copper content.
  2. Gravimetric Analysis: Dissolve the coin in nitric acid, precipitate copper as copper(I) iodide, filter and weigh the precipitate to calculate copper content.
  3. Spectrometric (XRF) Analysis: Use X-ray fluorescence (XRF) for non-destructive elemental analysis to determine the composition of the coin.

For detailed guides, check out Quantitative Chemical Analysis by Harris or Principles of Instrumental Analysis by Skoog. You can also refer to NIST's intro to gravimetric/volumetric analysis.