Doc Brown's School Science Website
@drphilbrown.bsky.social
Retired chemistry teacher. I write a massive science and photography website at www.docbrown.info also contact via chem55555@hotmail.com
In Brazil, many young people won't drink alcohol because of fear of fake drinks containing toxic methanol and ruins their social lives. BUT, why do we rely on alcohol to enjoy a good social life? For medical reasons I don't drink, my family drink very little if at all, but enjoy a good social life.
October 24, 2025 at 1:22 PM
In Brazil, many young people won't drink alcohol because of fear of fake drinks containing toxic methanol and ruins their social lives. BUT, why do we rely on alcohol to enjoy a good social life? For medical reasons I don't drink, my family drink very little if at all, but enjoy a good social life.
The internet e.g. google AI says 3-ethyl-2-methylpentane has a chiral centre and can form R/S isomers, I say NOT, who is correct?
October 23, 2025 at 7:52 PM
The internet e.g. google AI says 3-ethyl-2-methylpentane has a chiral centre and can form R/S isomers, I say NOT, who is correct?
🚨 The Treasury is threatening our national parks. Dartmoor, the Lake District & wild places could be bulldozed for development. Once gone, they're gone for ever. Join me and sign now to protect them: 38d.gs/rezg
Sign the petition: Save our National Parks
🚨 The Treasury is threatening our national parks. Dartmoor, the Lake District & wild places could be bulldozed for development. Once gone, they're gone for ever. Join me and sign now to protect them:
38d.gs
October 13, 2025 at 6:31 PM
🚨 The Treasury is threatening our national parks. Dartmoor, the Lake District & wild places could be bulldozed for development. Once gone, they're gone for ever. Join me and sign now to protect them: 38d.gs/rezg
80th birthday today, www.docbrown.info/page06/isome... so finally finished an analysis of isomers of C4H8O2, identifying at least 102 constitutional isomers and 154 stereoisomers, enjoyed the exercise, and the reast of the day with cake and friends
102 selected isomers of molecular formula C4H8O2 carboxylic acids & esters aldehydes ketones alkenes diols enols structural isomers carbon chain isomers structural formula skeletal formula of hydroxy...
www.docbrown.info
October 6, 2025 at 8:00 PM
80th birthday today, www.docbrown.info/page06/isome... so finally finished an analysis of isomers of C4H8O2, identifying at least 102 constitutional isomers and 154 stereoisomers, enjoyed the exercise, and the reast of the day with cake and friends
Apologies, something went wrong with C3H6O2 isomers image. It just shows 1-7, typical of what pre-university students should, but lots more isomers in reality!
September 29, 2025 at 6:25 PM
Apologies, something went wrong with C3H6O2 isomers image. It just shows 1-7, typical of what pre-university students should, but lots more isomers in reality!
Reposted by Doc Brown's School Science Website
Intellectual exercise, worked out as many isomers as possible (actual/theoretical) of formula C3H6O2 www.docbrown.info/page06/isome... >=33, very satisfying, x-ref errors on internet (particularly as I'm 80 in a week's time), corrected co-pilot & gemini lately, thanks & apology! You'll love C4H8O2!
September 29, 2025 at 6:09 PM
Intellectual exercise, worked out as many isomers as possible (actual/theoretical) of formula C3H6O2 www.docbrown.info/page06/isome... >=33, very satisfying, x-ref errors on internet (particularly as I'm 80 in a week's time), corrected co-pilot & gemini lately, thanks & apology! You'll love C4H8O2!
Intellectual exercise, worked out as many isomers as possible (actual/theoretical) of formula C3H6O2 www.docbrown.info/page06/isome... >=33, very satisfying, x-ref errors on internet (particularly as I'm 80 in a week's time), corrected co-pilot & gemini lately, thanks & apology! You'll love C4H8O2!
September 29, 2025 at 6:09 PM
Intellectual exercise, worked out as many isomers as possible (actual/theoretical) of formula C3H6O2 www.docbrown.info/page06/isome... >=33, very satisfying, x-ref errors on internet (particularly as I'm 80 in a week's time), corrected co-pilot & gemini lately, thanks & apology! You'll love C4H8O2!
Detailed re-editing page on isomers of C2H4O at docbrown.info/page06/isome... and also selected isomers of C2H4O2 at docbrown.info/page06/isome... , as ever enjoy!
3 structural constitutional isomers of molecular formula C2H4O functional group isomerism skeletal formula names of isomers of C2H4O uses properties applications doc brown's chemistry
docbrown.info
September 10, 2025 at 3:06 PM
Detailed re-editing page on isomers of C2H4O at docbrown.info/page06/isome... and also selected isomers of C2H4O2 at docbrown.info/page06/isome... , as ever enjoy!
www.bbc.co.uk/news/article... What a stupid ignorant US admin Trump is leading, such 'anti-science' moves is quite ignorant in the 21st century, these US guv organisations are/were? some of the best inthe world.
Fired CDC director Dr Susan Monarez says RFK 'weaponising public health'
The White House removes Dr Susan Monarez from her job running the US Centers for Disease Control and Prevention.
www.bbc.co.uk
August 28, 2025 at 12:55 PM
www.bbc.co.uk/news/article... What a stupid ignorant US admin Trump is leading, such 'anti-science' moves is quite ignorant in the 21st century, these US guv organisations are/were? some of the best inthe world.
Well now, no bird feeding today! It isn't just squirells that cause problems !!!
August 19, 2025 at 3:38 PM
Well now, no bird feeding today! It isn't just squirells that cause problems !!!
Soon off to Ireland again and a taste ofwhat is to come - the loop walk of Inishnee, 6 km and well waymarked, beautiful from start to finish. www.docbrown.info/docspics/iri...
beautiful scenic Inishnee Loop Walk (Inis Ni, Inis Nee island) harbour old church Connemara, Western Co. Galway, Ireland tourist information Irish holidays good interesting places must visit free imag...
www.docbrown.info
May 30, 2025 at 7:15 AM
Soon off to Ireland again and a taste ofwhat is to come - the loop walk of Inishnee, 6 km and well waymarked, beautiful from start to finish. www.docbrown.info/docspics/iri...
Major re-editing of permanent dipole - permanent dipole intermolecular bonding www.docbrown.info/page07/equil... lots of examples, but omitted hydrogen bonding - this is being covered in great detail on another page.
May 20, 2025 at 5:03 PM
Major re-editing of permanent dipole - permanent dipole intermolecular bonding www.docbrown.info/page07/equil... lots of examples, but omitted hydrogen bonding - this is being covered in great detail on another page.
Updated version of detailed notes on instantaneous dipole - induced dipole forces contribution to intermolecular bonding (London dispersion forces) www.docbrown.info/page07/equil... lots of different examples with diagrams, as well as mpts, bpts, delta H state changes, included viscosity.
viscosity instantaneous dipole – induced dipole intermolecular forces intermolecular bonding London dispersion forces examples explained with diagrams melting/boiling points Doc Brown's advanced level...
The different types of intermolecular force (intermolecular bond) are described, explained and discussed with examples i.e. Instantaneous dipole - induced dipole interaction (London forces, dispersive...
www.docbrown.info
May 15, 2025 at 8:38 PM
Updated version of detailed notes on instantaneous dipole - induced dipole forces contribution to intermolecular bonding (London dispersion forces) www.docbrown.info/page07/equil... lots of different examples with diagrams, as well as mpts, bpts, delta H state changes, included viscosity.
An introduction to intermolecular bonding and Van der Waals forces, also discussed dipole moments, polarizability and electronegativity and polar bonds .
www.docbrown.info/page07/equil...
www.docbrown.info/page07/equil...
May 8, 2025 at 4:46 PM
An introduction to intermolecular bonding and Van der Waals forces, also discussed dipole moments, polarizability and electronegativity and polar bonds .
www.docbrown.info/page07/equil...
www.docbrown.info/page07/equil...
New index of all my notes on intermolecular bonding, but 3 pages still undergoing major re-editing.
www.docbrown.info/page07/equil...
www.docbrown.info/page07/equil...
INDEX of notes intermolecular bonding intermolecular forces doc brown's AQA Edexcel OCR advanced level chemistry notes for A level courses
The different types of intermolecular force (intermolecular bond) are described, explained and discussed with examples i.e. Instantaneous dipole - induced dipole interaction (London forces, dispersive...
www.docbrown.info
May 8, 2025 at 4:38 PM
New index of all my notes on intermolecular bonding, but 3 pages still undergoing major re-editing.
www.docbrown.info/page07/equil...
www.docbrown.info/page07/equil...
Updated notes on vapor pressure www.docbrown.info/page07/equil... Despite its importance seems to have been downgraded by UK A level specifications.
Saturated vapour pressure curves for liquids, variation with temperature, vapour pressure graphs and boiling point for water ethanol benzene ethanoic acid tetrachloromethane doc brown's advanced level...
The liquid-gas phase equilibria situation is discussed and the vapour pressures of selected liquids are compared and discussed and the relationship between boiling point and ambient pressure.
www.docbrown.info
May 2, 2025 at 8:31 AM
Updated notes on vapor pressure www.docbrown.info/page07/equil... Despite its importance seems to have been downgraded by UK A level specifications.
www.gov.scot/publications... lack of uptake of secondary science teachers in Scotland, nothing changes in the 21st century! Probably the same in England?
Teacher Workforce Planning Advisory Group: initial teacher education intake figures 2024
Teacher Workforce Planning: initial teacher education intake figures 2024
www.gov.scot
April 20, 2025 at 11:25 AM
www.gov.scot/publications... lack of uptake of secondary science teachers in Scotland, nothing changes in the 21st century! Probably the same in England?
A useful climate change project bbc.co.uk/news/science... because seaweed is a useful raw material BUT bbc.co.uk/news/article... is another stupid project that 'costs the earth' and will not affect CO2 levels to any great extent - what are government advisors thinking? Your thoughts?
Climate change: Can an enormous seaweed farm help curb it?
A British businessman believes it could suck a billion tonnes of carbon out of the atmosphere annually.
bbc.co.uk
April 18, 2025 at 8:45 AM
A useful climate change project bbc.co.uk/news/science... because seaweed is a useful raw material BUT bbc.co.uk/news/article... is another stupid project that 'costs the earth' and will not affect CO2 levels to any great extent - what are government advisors thinking? Your thoughts?
A useful climate change project bbc.co.uk/news/science... because seaweed is a useful raw material BUT bbc.co.uk/news/article... is another stupid project 'costing the earth' and will not affect CO2 levels to any great extent - what are government grant (millions) advisors thinking? Your thoughts?
April 18, 2025 at 8:43 AM
A useful climate change project bbc.co.uk/news/science... because seaweed is a useful raw material BUT bbc.co.uk/news/article... is another stupid project 'costing the earth' and will not affect CO2 levels to any great extent - what are government grant (millions) advisors thinking? Your thoughts?
I know your not a scientist but what do you think of some of these climate change projects? www.bbc.co.uk/news/article... is another stupid project that 'costs the earth' and won't affect CO2 levels to any great extent - what are government advisors thinking? Money better better invested in people!
April 18, 2025 at 8:30 AM
I know your not a scientist but what do you think of some of these climate change projects? www.bbc.co.uk/news/article... is another stupid project that 'costs the earth' and won't affect CO2 levels to any great extent - what are government advisors thinking? Money better better invested in people!
A useful climate change project www.bbc.co.uk/news/science... because seaweed is a useful raw material BUT www.bbc.co.uk/news/article... is another stupid project that 'costs the earth' and will not affect CO2 levels to any great extent - what are government advisors thinking?
Climate change: Can an enormous seaweed farm help curb it?
A British businessman believes it could suck a billion tonnes of carbon out of the atmosphere annually.
www.bbc.co.uk
April 18, 2025 at 8:24 AM
A useful climate change project www.bbc.co.uk/news/science... because seaweed is a useful raw material BUT www.bbc.co.uk/news/article... is another stupid project that 'costs the earth' and will not affect CO2 levels to any great extent - what are government advisors thinking?
Analysed >50 molecules/ions using VSEPR theory www.docbrown.info/page06/molec... enjoy, feedback from you or your students, both + or - is very welcome, now time to follow the European football tonight. Last night Liverpool got away with the biggest robbery since the UK Great Train robbery in 1963.
March 6, 2025 at 6:09 PM
Analysed >50 molecules/ions using VSEPR theory www.docbrown.info/page06/molec... enjoy, feedback from you or your students, both + or - is very welcome, now time to follow the European football tonight. Last night Liverpool got away with the biggest robbery since the UK Great Train robbery in 1963.
I feel better for those delta H re-edits re-edits and note that King Charles III welcomed President Zelenskyy who was not required to wear a suit. I should point out that throughout most of World War II Winston Churchill was often dressed in a plain 'military service' uniform.
March 2, 2025 at 8:42 PM
I feel better for those delta H re-edits re-edits and note that King Charles III welcomed President Zelenskyy who was not required to wear a suit. I should point out that throughout most of World War II Winston Churchill was often dressed in a plain 'military service' uniform.
also re-edited page on how to calculate enthalpy of reaction using a Hess's Law cycle and bond enthalpies docbrown.info/page07/delta... and show how to apply corrections using enthalpies of evaporation/condensation to get results close to official accurate bomb calorimer values.
March 2, 2025 at 8:32 PM
also re-edited page on how to calculate enthalpy of reaction using a Hess's Law cycle and bond enthalpies docbrown.info/page07/delta... and show how to apply corrections using enthalpies of evaporation/condensation to get results close to official accurate bomb calorimer values.
Calmed down now, so re-edit of simple experiment to determine the enthalpy of combustion of an alcohol docbrown.info/page06/alcoh... comparison with accurate calorimetric values and reasons for errors. Alcohol and isomeric ether delta H combustion compared.
March 2, 2025 at 8:20 PM
Calmed down now, so re-edit of simple experiment to determine the enthalpy of combustion of an alcohol docbrown.info/page06/alcoh... comparison with accurate calorimetric values and reasons for errors. Alcohol and isomeric ether delta H combustion compared.