Bob Worley

Here is the video of the glistening crystals of lead iodide. The glistening crystals are formed during formation (as they are so thin) and by the bombardment with surrounding water molecules. #ChatChemistry, #ITeachChem @cleapss.bsky.social
#chemistry #greenchemistry @rsc-eic.bsky.social

Tiny speck of Pb(NO₃)₂ was introduced on the left (you can still see the remains) in a 1 cm diameter of water; I waited 10 seconds and put a tiny speck of KI from the right.

What a fantastic lead iodide precipitate by diffusion I obtained yesterday. The sparkling changes were beautiful.

We are comparing the diffusion speeds of halogens along damp starch/iodide paper. This activity is conducted in Petri dishes on the bench. The final section shows iodine result and uses 1 tiny ball of iodine.
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Thanks. The purple vapour is visible evaporation. Other solids evaporate, such as ice in a freezer and camphor and menthol at room temperature. I hope you have made a note of this.

Confusion abounds as to whether iodine sublimes or evaporates at 1 atm. In fact, it melts and flows. A little microscale triumph. See tinyurl.com/2nw2hram

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This is separating activated carbon from an aqueous suspension.

You can watch this method of filtering on youtu.be/6rSu-blfRZo. This is separating activated carbon from an aqueous suspension. Carbon was used to remove a dye.

Atmospheric chemistry is difficult for schools, but microscale techniques can help with evidence for ozone and hydroxyl radicals. Here are the videos referred to in the picture.
youtu.be/mlQRDuKm63w 
www.youtube.com/watch?v=U_PA...
www.youtube.com/watch?v=9jNh...
#ITeachchem

And there was I, thinking you sat down and watched these videos with pen in hand eager for all the information

if you go to 13 seconds in the video, there is a QR code to a supplier. I hope that helps

Here is a diffusing precipitate of silver iodide on a thermochromic plastic sheet so that the endothermic dissolving and the exothermic precipitation are seen.
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bsky.app/profile/cerg...

Watch highly coloured ions MnO₄⁻ & Cu(NH₃)₄²⁺ diffuse in a droplet of water using 2 different paths caused by presence of a magnet during electrolysis. Evidence of charged particles (ions). www.youtube.com/watch?v=qMta... and www.youtube.com/watch?v=w9oM...
#ITeachchem #RealTimeChem #chatchemistry

Using microscale techniques in school chemistry to show how carbon in CO₂ can be captured and imprisoned, but I had to let it go to show it worked! Video on www.youtube.com/watch?v=Tstu...
bsky.app/profile/did:...

YouTube video by Bob Worley IronIII thiocyanate complex

Watch for the effect of a magnet on the iron/thiocyanate complex. Paramagnetism at work.
www.youtube.com/watch?v=qipp...
#ITeachchem #RealTimeChem #chatchemistry @sfed-rsc.bsky.social

0.25 cm³ of 1M copper sulfate is added to the iron staples and 2 cm³ of 1.5M sulfuric acid It is heated for 10 minutes. Can also use steel paper clips. This is the personal spirit burner (ethanol biofuel) hotplate.

Using filter paper in small-scale chem does not work. Filtering the reaction mixture through cotton wool in a Pasteur pipette. Copper particles and bits of iron are separated from the iron(II) sulfate solution..

Heating the filtered solution for 10 minutes on my personal spirit-burner, bio-fuel, hotplate.

Then leave to cool. The crystals form slowly, which might take longer than a lesson, but the results are very beautiful.

Helplines asked #CLEAPSS for an alternative to CuO/H₂SO₄ neutralisation reaction salt making for students to make salts. Not easy, but using ed/ox metal/acid reactions uses the same skills. This is iron(II) sulfate made from staples.
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Making 1-5% soap solutions in 7:3 propan-2-ol/water. Filtered to get a colourless liquid. Laser light reflection indicates it is colloidal. Is the twinkling effect caused by collisions with water molecules?
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Evaporation with Thermochromic plastic and 2 kitchen thermometers. Visualise the flow of energy in an open endothermic process at room temperature—an evidence-based small-scale approach using easily available modern materials. #ChatChemistry #ITeachChem @sfed-rsc.bsky.social @cerg.bsky.social

Students encounter a precipitate every day as they wash with soap & make scum. @cleapss.bsky.social has had this method for 20 years as traditional methods were risky but now introduce a personal hotplate. Students stay still. #ChatChemistry #ITeachStudents @sfed-rsc.bsky.social @cerg.bsky.social

It works better with bottle top crucible. See Cleapss website. Do a comparison of methods if you want.

Five go to Thailand

This is the link to www.rsc.org/news-events/... for an account of the chemistry education trip to Thailand. @bogwoppitfee.bsky.social #ChatChemistry, #ITeachChem @cleapss.bsky.social @associationscied.bsky.social @roysocchem.bsky.social @beyondben.bsky.social , @unitednationsbk.bsky.social

It is all about energy. I think chemists are rather scared of the topic. We invent octet rules to explain and ditch it. We are awe of physics teaching.

With the correct equipment on silica, you get this for Parker and Octopus Fountain Pen Ink. But inflation means schools are increasingly unable to afford this equipment. The effect is stunning using the solvent mixture butan-1-ol/ethanol/water in the ratio of 3:1:1 and a drop of conc ammonia.

Many helpline calls regarding aspirin syn come to @cleapss.bsky.social. The cost of the TLC slide is rising more than inflation for schools. Can use iodine to see the chromatogram. The hotplate design comes from teachers in Thailand. Applying #GreenChemistry principles. #ChatChemistry #ITeachChem

YouTube video by Bob Worley Silver nitrate reacting with copper wire

www.youtube.com/watch?v=bj1B... This is copper wire into 0.06 AgNO3 on a plastic surface under a USB microscope. Mobuke phone are good now. ooops!

Thanks. You can look at these slides and always contact me #ChatChemistry

YouTube video by Bob Worley The reacion between nitrogen monoxide and oxygen.

See www.youtube.com/watch?v=p_MU... to see how to make NO gas in a syringe.

YouTube video by Bob Worley Advanced catalytic cracking

You can use the same approach to make prepene from propan2-ol and alkenes from polythese. See this. www.youtube.com/watch?v=ENyC... where I do a bromine titration of the cracked gases.

Newish approach to an old experiment as white phosphorus is no longer available. Red phosphorus is. It was the first use of bottle top in school chemistry as an inexpensive alternative to the crucible. @cleapss.bsky.social subscribers see PS67l Burning phosphorus in air
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We tried this after a Helpline call. "Is this still OK to do". Of course it is. It is also on edu.rsc.org/exhibition-c...
Our catalyst got so hot it vaporised. Clean the copper foil in acid beforehand and the reaction lasts nearly an hour.
#ChatChemistry, #ITeachChem @cleapss.bsky.social

Rehearse any demos or student practical activitites so you look confident using chemicals and manipulating equipment "on stage". Because that is what you are but remember, you are NOT a children's TV entertainer.

I hope the new teachers & technicians explore the resources of @CLEAPSS on science.cleapss.org.uk. They can phone or email to get expert advice on any practical activities, safety, storage disposal, recipes, etc. We are not just the safety police! Enter "cracking" into the search engine.