just found a gem channel

@ronhipschman

14 күн бұрын

Thanks! Glad you're enjoying them!

Thomas Midgley destroying the ozone layer strikes me as being somewhat forgivable since nobody could have anticipated that. But his pushing of tetraethyl lead was unforgivable. The hazards of absorbing lead had been known for thousands of years, and he damned well knew it.

Right on, Ron! The exotic elements are fun, but it's good to get one about the more familiar ones. As you mentioned lead has a sweet taste. Those flaking paint chips were like candy to children. Always have your garden soil tested for lead. The tetraethyl from car exhaust can still be found, especially near walls and rain runoff channels. I was still buying leaded gasoline in 1987, as there was a huge stockpile of it leftover from the '70s.

@ronhipschman

9 күн бұрын

All great points. The video was getting a bit lengthy, however. Thanks for amplifying additional material here in the comments. Ron

If I did my arithmetic properly there is an error at 4:05 where 4,720,000 metric tons is said to be a cube 7.5 meters on a side. It's a cube 74.9 meters on a side - off by a factor of 10 in the linear dimension.

@ronhipschman

15 күн бұрын

@jonahansen, Thank you. I re-did the calculations and you are absolutely correct. Unfortunately, KZread does not allow editing videos, and I would lose all the credit it's gotten. Instead, I have added an important note to the video description correcting the error with a big thank you to you and your sharp eyes (and calculator!) Thanks, Ron

@jonahansen

14 күн бұрын

@@ronhipschman No problem. It just seemed off to me, that's why I checked it out. I like your videos very much. Thanks!

I have to wonder at that chart on how elements are produced that lead's production from supernovae seems to decrease then increase. I wonder if that reflects that it is a decay product of thorium and uranium, which are produced in supernovae. I don't remember if you mentioned it, but if you look at a stained glass window, the individual pieces of glass are have gray boundaries. That boundary is lead metal which serves to hold the glass in place. (Or was until we started banning lead.) And, of course, lead can protect Superman from the deadly rays from green kryptonite, and protect our modesty from his x-ray vision. All of which goes, I guess, to show some elements can be contained in a twenty-minute video and others strain to be contained in a 43 minute video. Excellent video.

@ronhipschman

9 күн бұрын

I didn't mention stained-glass windows. Thank you for adding it to the comments! Ron

Lead was also used in roofing which is where I came in contact with it. Dad was a carpenter.

@ronhipschman

9 күн бұрын

Another application I was unaware of. Thanks for adding! Ron

@sydhenderson6753

Күн бұрын

@@ronhipschman It's probably been replaced by now as an environmental hazard.

Ironic that the stuff that makes up the "lead" in pencils is in the same group (group 14) as actual lead. Sad that after lead it's farewell to the stable elements :(

@ronhipschman

15 күн бұрын

I'm not sure I see irony there - just coincidence. (Please explain if I missed something important...) Yes, moving into the radioactive elements will make things more difficult (and the videos much shorter, and probably less visual!) I'm not sure how I should handle that. There are really only a few left (Po, Rn, Ra, Th, U, Pu, and Am) that really have any application or that we've made visible quantities. I may have to do group videos. Any suggestions? Ron

@sydhenderson6753

12 күн бұрын

@@ronhipschman Bismuth also since for all practical purposes it's stable and is quite useful (mostly as a replacement for lead).

The irony is that carbon in the form of graphite is called “lead” when used in pencils which again is in the same group of the periodic table (group 14) as carbon. I don't know of any more details I can point out other than carbon in the form of graphite being called lead, another element of group 14. 🤷‍♂️

@sydhenderson6753

12 күн бұрын

The element molybdenum's name comes from the Greek word for lead since one of its compounds resembles lead and graphite. This must cause problems for Greek chemists. (The words are molybdainio for molybdenum and molybdos for lead.)

@CliffSedge-nu5fv

Күн бұрын

As writing elements, Pb is called white lead, and C is called black lead.

very interesting video! 😇

@ronhipschman

9 күн бұрын

Thank you! 😃

great vid

@ronhipschman

8 күн бұрын

Thanks!

2:19 - Can you confirm that this is the literal translation from the original texts, or is this just the King James version of the bible where there are known "modernizations" of analogies?

@ronhipschman

14 күн бұрын

Sorry, I'm not a biblical scholar. I just looked this up on-line somewhere and trusted it. If you have additional insights, I'd love to hear them. Ron

@ronhipschman

14 күн бұрын

Here's an interesting comparison: biblia.com/bible/nasb95/exodus/15/10 Ron

airplane feul is leaded still

@ronhipschman

15 күн бұрын

@brickchains1 Thank you for that. I had found that factlet too, I just forgot to add it. This video was completely out of hand with its length. Ron

@brickchains1

14 күн бұрын

@@ronhipschman I LOVE YOUR VIDS I LOVE CHEMISTRS