hypervalent_iodine

6 minutes ago, StringJunky said:

@Phi for All I don't care that I have 12000 posts, I want them got rid of now. If you don't I'll empty SFN of cheese nips. 

When one posts one should accept it's there forever and even if they were deleted, it is still kept under various government retention Acts or Decrees for some specified minimum time in the servers.

You’d have to find them all first.

I think you have still neglected to include context as some of those questions are not answerable as-is. 

Briefly:
As written, your answer to 1 (a) i doesn’t make sense, or it is just incorrect. It doesn’t specify indium nitrate or metal, but I would read that to mean elemental indium. I assume there is more context here. Also, it is more correct to say it is in group 13 (group 3 is still accepted), but that does not mean the oxidation state is going to be 3+. In⁺ is also possible, for example. 
 

I would also add that saying hydrogen is reduced is not the best wording. Better to specify H+.

8 minutes ago, iNow said:

Blike IINM

Correct. 

They are listed in the staff directory as an admin and the mods and admin all know who he is, but that doesn’t always mean we can get in touch easily. Honestly, it wouldn’t be SFN if we didn’t let the domain lapse every few years. 

Is RP chromatography a possibility? I normally use C18 cartridges on an MPLC unit for any of my peptide work and haven’t had an issue. I would also normally use 20% piperidine in DMF for Fmoc removal, but this is for SPPS so possibly not as easy in solution phase. The other option, which might be a bit much if this is just a single amide bond you’re making or your starting material is precious, is to load it onto a resin and do the synthesis that way.

2 hours ago, iNow said:

Who cares? It’s the internet. For all we know, they’re genetically modified kittens who learned to type.

All that matters is WHAT gets posted, not WHO posted it. 

Thank you, and I’ll say I worked very hard on teaching them how to type / finding an appropriately sized key board, so it’s nice to have my work recognised.

6 hours ago, beecee said:

Your point is actually spot on. My intentions in starting this thread was to highlight extreme weather events  happening far more often, and the climate change connection.. 

Yes, there is/was a difference. Plus the overall effect of this system, going beyond Brisbane makes it probably the worst. This system has moved down the coast, into NSW and flooded towns like Lismore and Grafton, and at this moment is battering Sydney and the south coast. 4 dead so far but it is expected to go higher.

A point I wholeheartedly agree with. There is a lot of literature in the crisis management space that discusses this and treats the increase in frequency and severity due to climate change as a given. The way that plays out in policy is interesting. 

As a side note, the floods in 2011 didn’t just hit Brisbane either, they impacted roughly 75% of QLD all told. We won’t really be able to know how the damages and costs compare until it’s finished battering the NSW coast, but I would guess you are right that the net effect including NSW (especially Sydney) might tip the net cost over what happened in 2011. It also looks like we’re getting severe thunder storms and giant hail tomorrow up here, so fingers crossed we get through round 2 relatively in tact. 

6 hours ago, beecee said:

In 2011, we had catastrophic floods that were seen as one in a hundred year event: 11 years later we have these floods that are even worse according to the peak river levels. Some redefining needed with the influence of climate change methinks. 

The rainfall totals for this current event have been staggering to say the least.

From 9am Thursday to 9am Monday three stations recorded over a metre of rain:

- 1637mm at Mount Glorious, QLD - 1180mm at Pomona, QLD- 1094mm at Bracken Ridge 

Brisbane has absolutely smashed its three-day rainfall record with 677mm, by recording over 200mm each day for three days in a row

Before this week it had never even had two consecutive days over 200mm and had only ever recorded eight in total.


The mean annual rainfall for Brisbane is 1011.5mm and it recorded 741mm in just the four days from 9am Thursday and 9am Monday.


Speaking of records, Weatherzone is reporting Dunoon in NSW recorded the second-highest daily rainfall total in NSW when 775mm fell in just the 24 hours to 9am Monday.


If you are not sick of stats yet, Doon Doon in NSW picked up a whopping 1040mm of rain in just the 48 hours to 9am Tuesday. That is over a metre of rain in just two days.

https://www.farmonlineweather.com.au/news/how-unusual-is-all-this-rain-were-having-the-answer-very/536372

And as this weather event has moved south, today is Sydney's turn, not that El Nino has not already given us our wettest summer ever!

I don’t want to detract from your main point too much, but I have lived in Brisbane through both. The 2011 ones were way worse, but also quite different. Those ones came after months of non-stop rain. They didn’t manage the dams properly and sent a tidal wave down the river when it got to the point where they had no option but to release water. The damage and flood levels were considerably higher in 2011. The house I lived in at the time was thankfully on a hill that became an island for a few days and we were without power for four days, but we were lucky. Even before this weekend there were properties that had not yet recovered from 2011, largely thanks to insurance companies who refused to pay out and people being forced into bankruptcy. These floods came quickly and surpassed predictions, which did mean that people that probably should have evacuated did not. There were a surprising number of deaths, but if I had to guess I’d say the suddenness of it all was at least partly to blame. Properties and areas that didn’t have good drainage suffered badly, but 2011 was still worse. 

My assumption is that it is asking you for the masses of each individually to make up a litre of solution with those concentrations and that the first number is meant to be in M. The last bit is an assumption though so I would check that. How much is also kind of vague and not stated but the only way I can think to answer it (it isn’t even really a question it’s just a statement) with that information is with masses.

What reactions have you learnt about so far that might fit? Can you identify where the fragment on the left appears in the product?

While this thread is closed and (I think) being the only person who identifies as female in this thread, I just wanted to provide a little food for thought. Of all the women in my life with whom I am close to, I can't think of a single one who hasn't been sexually assaulted or raped by a man at some point in her life. I cannot say the same about the men I know wrt to false accusations. Anecdotal I know, but something to think about. 

I think it’s also important to note that we don’t always agree on a particular course of action such as banning every time it is suggested and will make compromises that everyone can agree to regularly. Conferring with one another isn’t merely an exercise in box ticking. 

2 hours ago, Klaynos said:

I agree. Having friends who were on short term contracts for 20 years makes me somewhat cynical. 

What, you don’t like rolling 3 month contracts completely contingent on obtaining a portion of the ever-dwindling pools of grant money available? Weird. 

After some further discussion, staff have updated the above to now read:

Quote

Attached documents should be for support material only; material for discussion must be posted. Documents must also be accompanied by a summary, at minimum. Owing to security concerns, documents must be in a format not as vulnerable to security issues (PDF yes, microsoft word or rich text format, no).

You mean by their chemical shifts etc? There are many resources online that will go through it. 

Daniel Waxman has been banned as a sock puppet of drumbo.

Sometimes I think about removing it, but I just can't bring myself to pull the trigger. 

9 hours ago, zapatos said:

She literally had no idea how to apply, where to apply, how to fill out applications, and could get no help from those in her family as they were just as clueless.

This is a very good point! I am currently reading a lot in relation to some new (and generally awful) reforms to our higher education sector that were just passed here in Australia. In some of the submissions to parliament, it was highlighted that one the key factors leading to under representation of Indigenous people in universities is that they often don't know what they have available to them. As such, the prospect of enrolling and relocating seems financially daunting and confusing. It is also one of the things that can lead to low levels of retention. Students who live in more metropolitan areas (and more likely to be white) are much more exposed to university life, either through linkages in their school or because someone in their family has been, etc. 

On 9/30/2020 at 2:57 AM, NerdShift said:

Thanks for your reply.

Yes i know about the Aufbau principle, but as I've expressed in my first post, Zn, Cd and Hg are exceptions (also ₂₄Cr, ₄₂Mo & ₇₄W);

For example when an atom has 20 electrons (Ca), its 4s is filled while the 3d is empty, and in an atom with 21 electrons, the 21th e belongs to 3d; so we expect the next atoms to have a filled 4s subshell while their 3d is not filled yet, but when we reach Z=24 (Cr), we'll realize that its electron configuration is:

₂₄Cr: [Ar] 3d⁵ 4s¹ (instead of [Ar] 3d⁴ 4s²)

And this is also true for ₂₉Cu; which has a filled 3d but a half filled 4s:

₂₉Cu: [Ar] 3d¹⁰ 4s¹

(I think it might happen due to the more stability of filled & half filled subshells...)

So, I really expect the 30th electron to go to the 4s subshell and fill it, as we see in Zn's electron configuration:

₃₀Zn: [Ar] 3d¹⁰ 4s²

Thus, if the last electron of Zn (30th) belongs to s subshell, why does zinc belong to the d-block?!

(I know about the blocks;

How elements are separated to s p d f blocks, according to my high school book:

If the last electron of an atom belongs to a special subshell, the atom would be in the corresponding block.

(I know it might be simplified, that's a high school book afterall.)

So I feel a contrast between the subshell to which the 30th electron belongs, and the definition of blocks.

Please let me know if I am wrong

& Sorry for non scientific terminology or grammatical mistakes, I am not a native English speaker you know

 

Yes, sorry, I was writing on my phone so I didn't have time for a full reply. 

The two exceptions you mention are actually a little misleading. I believe that in reality, they do fill the 4s orbital first, then as electrons start filling up the 3d orbitals one of the 4s electrons moves into the 3d to give 3d⁵4s¹ / 3d¹⁰4s¹. It is not a case of only putting one electron into the 4 s and then filling up the 3d orbitals, which is maybe where you are confused with Zn. The reasons for this come down to stability, as you mentioned. It is more favourable to have a completely full or half full set of d orbitals. 

Actually, the 4s is filled before the 3d. I suggest looking at the Aufbau principle to help with this, but you can also figure out out by looking at the periodic table if you know where the s, p, d and f blocks are.

I was more talking about the coverage of the article. However, they discounted the possibility of SO2 because in order to observe the results they got, it would need to be a bit hotter (about double) than what is measured in the upper clouds. Surely the simpler explanation is that they detected SO2 that was a bit hot, as opposed to phosphine? 

I’ll admit this isn’t an area I know much about but the results seem a bit (a lot?) overstated. They aren’t even completely sure it’s phosphine. I read somewhere that the rotational transition they measured could also be within the same region that SO2 might absorb on a planet with H2SO4 clouds. Is this accurate?

On 7/25/2020 at 8:20 PM, swansont said:

IDoNotCare has been suspended for multiple rules violations, including abusive posts and soapboxing

Exciting update! IDoNotCare had now been permanently banned for similar offences. 

Staff have recently decided to update the text of Rule 7:

essereio has been permanently banned for repeated violations of rule 2.1. 

It is a 14 year old thread, so it’s not totally surprising most of the links no longer work.