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Chemistry with Dr H
Приєднався 26 січ 2014
Preparation for A level 4 Joined up Thinking
Preparation for A level 4 Joined up Thinking
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Відео
Preparation for A level 3 - Moles calculations
Переглядів 16Місяць тому
Preparation for A level 3 - Moles calculations
Preparation for A level 2 Bonding and Struture
Переглядів 22Місяць тому
Preparation for A level 2 Bonding and Struture
Preparation for A level 1 Atomic Structure and the Periodic Table
Переглядів 29Місяць тому
This is the first of four videos that focus on some key GCSE ideas that you must be 100% confident about before you start your A level Chemistry course.
International Dawn Chorus 2020, from Bruisyard, Suffolk, UK
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International Dawn Chorus 2020, from Bruisyard, Suffolk, UK
Botswana Singaba Hamba
Переглядів 3104 роки тому
A selection of photos from the Framlingham College trip to Botswana, July 2019, with musical accompaniment.
AQA GCSE Chemistry Electrolysis part 2 - Required Practical
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This video is about the main application of electrolysis in the GCSE specification - extraction of aluminium, and then goes on to discuss some typical exam questions on electrolysis. See Part 1 for an explanation of the theory behind electrolysis.
AQA GCSE Chemistry Electrolysis part 1 -Required practical
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This video covers all the theory behind electrolysis at GCSE level. See Part 2 for the most important application of electrolysis that you need to know, as well as how to answer some exam questions.
GCSE Required Practical: Rates of Reaction Part 1 - analysing graphs
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GCSE Required Practical: Rates of Reaction Part 1 - analysing graphs
GCSE Required Practical: Rates of Reaction Part 1 - the experiment
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GCSE Required Practical: Rates of Reaction Part 1 - the experiment
AQA GCSE Required Practical - Energy Changes
Переглядів 3,9 тис.6 років тому
Revision of the basic experiment and some examples of the sort of questions you might be asked in an exam.
AQA GCSE Required Practical - Rates of reaction Pt 2
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The disappearing cross experiment and how to answer the typical questions you get asked at GCSE.
AQA GCSE required practical - Chromatography
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This video includes the technique itself, and how to answer likely GCSE questions on Chromatography.
A Level Chemistry Mechanisms - electrophilic addition
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A Level Chemistry Mechanisms - electrophilic addition
GCSE Chemistry Reacting masses calculations
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GCSE Chemistry Reacting masses calculations
GCSE Chemistry Making an insoluble salt by Precipitation
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GCSE Chemistry Making an insoluble salt by Precipitation
Making a salt from an alkali + acid
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Making a salt from an alkali acid
AQA GCSE Required Practical - Making a salt from an insoluble base
Переглядів 95 тис.10 років тому
AQA GCSE Required Practical - Making a salt from an insoluble base
GCSE REquired Practical - How to do a titration
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GCSE REquired Practical - How to do a titration
Bond energies and enthalpy changes - GCSE and A level
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Bond energies and enthalpy changes - GCSE and A level
nice
Thanks alot. Your video is so helpful
Best demonstration! 🌷❤️
This is so boring
No-one forced you to watch it, did they? If you already understand it, brilliant, and if you don't, well, some people enjoy learning and understanding stuff.
The corrosive warning liquid is definitely NOT Water!
Super!
thank you sir🫡
this is cognito i swear
U hlakile
LOVE THIS VIDEO ❤❤❤❤
Very brave not wearing gloves
Love the vid, but aren’t the endo/exo directions reversed here? You apply thermal energy, so in order for the solution to cool down, shouldn’t it go in the exothermic direction? Exothermic means to release thermal energy. Isn’t that how it would cool down…and Vice versa, if it’s cooled it needs thermal energy so it should go in the endothermic direction?
Releasing thermal energy means that the surroundings (which include the water that the chemicals are dissolved in) warms up. So if a reaction goes in the exothermic direction, the surroundings warm up. Endothermic reactions take in thermal energy (and, importantly, change it into chemical energy, which we cannot actually measure) from the surroundings, so the surroundings cool down. So if I heat up a reversible reaction, it tries to oppose that - thermal energy is taken from the solution I am heating and converted into chemical energy - that is an andothermic reaction.
@@richardhiggins6471 We are in agreement. At least to me, we’re saying the same thing. I think the frame of reference regarding the expressions “it tries to cool down” and, “it tries to warm up” is the cause of confusion. What the “it” is is the crux of the issue. I took the “it” to mean the reaction and not the environment…so if the reaction is trying to “cool down”, it would do so by moving in the direction that would release energy, thus exhibit an exothermic process. Do I have this wrong?
Nice demonstration 👍🙏
I really love this video. Thanks a lot sir!
❤❤❤❤❤ Amazing
What is the liquid that evaporates from the solution
Just water.
Yet another cracking vid
colour change tho 😮💨
omg say smth else stop repeating excess
What a GREAT video! I had such a hard time reading the concept and seeing this makes it so clear. Thank you!
Does this apply only if there is enough limiting reactant available to form more product? Or does the principle itself imply that there is always available reactant because there is always product being decomposed? In a sense, making the concept of "limiting" reactant null?
When there is a reversible reaction in equilibrium, you don't have to worry about the concept of limiting reactant as the reaction won't go to completion anyway.
❤
Great , concise video with nice demo. 👍
this is awesome can we have the weekly uploads though
Thank ya!
Could you name the used reagents, please?
Hydrogen peroxide, potassium sodium tartrate (also known as Rochelle's salt) and cobalt chloride catalyst. I cannot recall the exact concentrations.
ua-cam.com/video/aENiiZblKpc/v-deo.html
Thank you, sir! Sadly, our teacher didn't show us the chatelier principle irl, so it was hard to understand the concept. You've saved a life!
Thanks a lot.
You are welcome.
Yeah
thank you soooo much i've been looking for an explanation!! :)
thanks! im helping my brother out but I had no clue what it's principle was! Thanks man <3
This is so helpful and actually helped me understand the concept better! Thank you so much!!!
Sorry. My friend wrote f you
so glad i stumbled across this, in y11 my chem teacher is so bad and this is perfect to finally understand
damnn i didnt know his name is prounced so fancy. my teacher says it as 'lee-chat-lee-ar". I've been deceived
how to make alkaline solution from pure gold which precipitates (insoluble) in h2so4, please???????? Please shere that info.
thank you!
how to make meth tutorial
this guy is a genius. its like he is a examiner thank you very much. better than freesicnelesson for sure
Thanks for your kind cmments. Good luck with the revision.
grade 9 students taking end of year exams soon what are the most common questions for grade 9 test questions
thank you. i finally understood.
BRILLIANT!!
You didn't put it on safety flame
Best video ever!
Ok I like it picasso
coooollll!
great
Great video! It is a bit misleading at the very end though. As mentioned, reactions will shift the exothermic direction when cooled and the endothermic direction when heated, but this does NOT always mean it will shift left for exo and right for endo. This one does because the forward reaction is endothermic.
so pretty!!
Thank you!