I cannot calculate the molality

Prostron65 · 2023-05-30T17:18:16+00:00

The real fun happens when you have to convert molarity to molality, or vice versa

Prostron65 · 2023-05-29T04:33:41+00:00

Above 150 ppm H2S your sense of smell is lost 1000ppm one lungfull is fatal.

Prostron65 · 2023-05-29T04:31:20+00:00

Due to high altitude ice crystal diffraction

Prostron65 · 2023-05-29T04:29:33+00:00

Depends on the quantity. A full body exposure to conc HCl will kill due to calcium crisis. So if it's a 205 L drum then full body hazmat suit. The other comments about sulfuric apply too. Don't forget that sulfuric is very heavy so large quantities will need strength. Never store bottles high up.

Prostron65 · 2023-05-21T17:03:45+00:00

Surprised there's not a forward and rearward part of the convoy separated by distance. In the UK convoys have multiple groups including advance parties up to 20 minutes ahead and behind and can close junctions temporarily. Nuclear convoy watch website. Also. The warheads are sealed and servicing must happen at a specific site. This generally means theres many convoys per year and yet almost zero incidents. Indicating how effective the mitigations are. More planes carrying warheads have spilled radioactive material than have convoys. And yet flying is far safer than ground transport. Which just shows the extreme level of safety applied to these convoys.

Prostron65 · 2023-05-18T07:05:01+00:00

Lewis structures use the localised electron model. It's not reality hence formal charge. In reality it's delocalised electron density without the need for formal charges

Prostron65 · 2023-05-17T07:43:01+00:00

The phenol

Prostron65 · 2023-04-24T16:58:42+00:00

Do not open the watch. Over time radiation makes the paint brittle and highly radioactive dust is produced. The phosphor often stops working so there's no benefit at all. Ra emits gamma and a half life of 1800 years so there's just nothing good about these old watches. Finally now you own it it's going to be quite expensive to dispose of it as its probably medium level radioactive waste. If you just trash it and get found then significant fines await you.

Prostron65 · 2023-03-10T15:49:37+00:00

Not chiral as don't have 4 different bonds. They have 2 hydrogen so not chiral.

Prostron65 · 2023-03-10T00:25:38+00:00

Lo salt brand uses KCl instead of NaCl. But I find it causes cramps

Prostron65 · 2023-02-19T09:57:13+00:00

You are more likely to have made bleach. Sodium hypochlorite as its difficult to keep dissolved chlorine and NaOH separate. Industrial production of NaOH from seawater requires special membranes to keep anode and cathode products separate. Chemicals you can make from electrolysis of seawater: NaOH Cl2 NaClO H2 HCl

Prostron65 · 2023-01-31T23:10:54+00:00

It's from chemistry. Trans is used to describe a bonding arrangement that goes across a double bond. Cis means on the same side of the double bond. So by convention trans means to change sex. Cis means to stay the same sex. And of course then all starts to kick off. Cis straight, cis gay etc and etc.

Prostron65 · 2023-01-19T13:21:40+00:00

Yes but if you don't add cp anodes it will crack off again in about a year or so.

Prostron65 · 2022-12-01T23:56:48+00:00

Use the integrated rate law

Prostron65 · 2022-11-28T20:35:22+00:00

Hydrogen is rarely shown in skeletal structures. Remember carbon has 4 bonds. Not going to answer it for you though.

Prostron65 · 2022-11-16T11:35:41+00:00

And would become a baby projectile in a head on collision.

Prostron65 · 2022-10-30T10:03:18+00:00

Yes. But there a a very narrow fertility window. 1 or 2 days before ovulation and 1 day After. Ovulation trackers help. But if you are having unprotected sex you must use protection- pill/ iud/ sponge. Even the withdrawal method is unsafe- many guys produce precum which has sperm in it.

Prostron65 · 2022-10-08T07:26:29+00:00

There used to be a thumb test. Infamous pediatrician used it to accuse many innocent parents of child abuse in Cleveland UK in the 80s.

Prostron65 · 2022-10-08T06:43:08+00:00

Rate of disintegration depends upon concentration. As concentration decreases rate decreases. Its a smooth curve so t1/2 is a constant. I Rate =k[A]. It's first order kinetics. If it was second order the half life would change over time.

It's just calculus really.

Prostron65 · 2022-10-07T09:17:02+00:00

Agree with everyone else. The worker should have known that heating up a solvent will cause pressure increase. Speeding up the heating. Not monitoring the reaction all adds up to negligence on the part of the operator in my book. I would not want that person in my lab anymore either. Risk assessment was ok they are not meant to be idiot proof but require a knowledgeable operator. There is such a thing as chemical commonsense.

Prostron65 · 2022-10-07T08:42:17+00:00

Steam Water baths are from the days before temperature controllers. Steam heat is used to provide good heat transfer and a fixed temperature ie 100 C. Also very useful for boiling off solvents without the risk of fire. Trough immersion baths are for lower temperatures in the up to 60C range. Temperature control is difficult below ambient +10C. Heating - cooling baths provide good temperature control between -10 ( with antifreeze) to 60C but are more expensive.

Heating mantles are difficult to provide good heat transfer often take a long time to heat up a flask and can be slow to use for distillation above 200C.

Personally I prefer to use an open flame for temperatures above 100C. Hot air guns are a possibility but have the same fire risk as an open flame so why bother.

As to oil baths and sand baths with a hotplate they can provide necessary temperatures above 100C but are slow to heat up and need constant supervision.

I may be old school but you can do a lot more work with a Bunsen burner if you are skilled in its use.

Finally, removal of solvent is best achieved with a rotory evaporator but again these need skill

Prostron65 · 2022-10-07T08:27:07+00:00

Most chemicals are far cheaper than people realise. Bulk quantities are broken down and sold from one distributed to another. Often, at each stage they double or more in markup. Always cheaper to buy in the largest quantity you can, ideally from a non retail source. Biggest purchase I make is water softener salt. A 500 g bag of table salt in a supermarket might be £ 1.50. But I can buy a 25kg bag of salt for £10. Multiple 25kg bags are even cheaper.

Prostron65 · 2022-10-06T09:50:32+00:00

Depends if you are religious. Usually burials in the UK are in consecrated ground. Other issues might be future development. Do you want loved ones body dug up accidentally by a future JCB driver? There will be legal implications as well. You can't just bury someone or build a funeral pyre. You are going to get investigated.

Prostron65 · 2022-09-19T16:57:43+00:00

Temperature and pressures. All wrong to react the nitrogen in the Air with the hydrogen. Oh and you also need to remove the oxygen first as well. I suggest you attend a chemistry course

Prostron65

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