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Is plane of symmetry a necessary and sufficient condition for optical inactivity in coordination compounds?

In organic chemistry, we have to check for all three types of symmetry in a compound to check its chirality, ie, plane, alternate axis and centre of symmetry. But in coordination compounds, do we need to check all the symmetries to check its chirality? The ligands are supposed to be achiral. The difference between the […]

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Why is the compound isooctane an exception to the word ‘iso’?

Iso-octane is an organic compound having formula (CH3)3CCH2CH(CH3)2. Its IUPAC name is 2,2,4-Trimethylpentane. ‘Strictly speaking, if the standard meaning of ‘iso’ is followed, the name isooctane should be reserved for the isomer 2-methylheptane.’ But it is not the case. Why isn’t that? https://en.wikipedia.org/wiki/2,2,4-Trimethylpentane I have searched many organic chemistry books but haven’t found appropriate reason. […]

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Apple User Help

Why is accountsd using so much of my CPU? Conversely, why are my computer’s fans overheating so quickly and often? [duplicate]

I have a somewhat new MacBook Pro running Catalina, and very recently I began having a fan issue. No matter what I did, my fans seemed to be running at full power, and I can’t for the life of me figure out why. I checked my Activity Monitor, and it keeps saying accountsd is using […]

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Apple User Help

Why is accountsd using so much of my CPU? Conversely, why are my computer’s fans overheating so quickly and often?

I have a somewhat new MacBook Pro running Catalina, and very recently I began having a fan issue. No matter what I did, my fans seemed to be running at full power, and I can’t for the life of me figure out why. I checked my Activity Monitor, and it keeps saying accountsd is using […]

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Hybridization of orbitals and forming of bonds in the NO_2 (nitrogen-di-oxide) molecule

is what I drew, I considered Nitrogen atom hybridizing it’s orbitals and then ending up having 3 "sp^2" orbitals and the Oxygen with 2 "sp" orbitals. The thing which bothers me is when people draw a radical (single electron) over the Nitrogen atom after there is bond formation between Nitrogen and 2 Oxygen atoms. Lets […]

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Human brain mechanism in comparison to computers

Can it be said that the human brain works like a computer based on the data it receives? Is the outcome of processes that take place in the human brain something more than that? More than accumulation of some information and then do something according to that information? More than working on the basis of […]

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Apple User Help

Why can macOS have two files with same name?

I found there are two files with same names but one with extended attribute while the other not: -rw-r–r– 1 nanxiao staff 351K Sep 28 12:29 db_chunks.csv -rw-r–r–@ 1 nanxiao staff 351K Sep 28 09:55 db_chunks.csv So when I open db_chunks.csv, which file is actually operated? What is the relationship with these two files? P.S., […]

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User Help Web Pro

How to generate sitemap for angular web application

I am developing a website using MEAN stack technology. So I want to create a sitemap for all urls present in webpage and also video and image sitemap. Website is dynamic and there will surely be more links in future and more images and audios as well. So can you help me in creating a […]

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What made “activated red phosphorus” so long to be discovered?

[WP = white phosphorus ; RP = red phosphorus ; ARP = activated red phosphorus] Tom from Extraction & Ire did a video two years ago(2018) on converting WP to RP by keeping the former in sunlight for several days. He chose chloroform solvent to dissolve WP in a glass vial. The solution started to […]

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Apple User Help

Recurring system.log process: “com.apple.dpd: Service exited with abnormal code: 75” – Catalina 10.15.7

I’ve been trying to remove this weird recurring process that happens every second in my system.log: Sep 27 23:45:12 User-iMac com.apple.xpc.launchd[1] (com.apple.dpd[1749]): Service exited with abnormal code: 75 Sep 27 23:45:12 User-iMac com.apple.xpc.launchd[1] (com.apple.dpd): Service only ran for 0 seconds. Pushing respawn out by 1 seconds. It’ll also randomly throw this SIGKILL message: Sep 27 […]