Chemistry: Post your doubts here!

[Madina2410]

hello , can anyone please construct a Hess Cycle for me based on this

 

[romeopoomore]

View attachment 65271
hello , can anyone please construct a Hess Cycle for me based on this

 

[Madina2410]

👏🏻 👏🏻
👏🏻 god bless you .

 

[Madina2410]

But the problem is , isn’t the entalphy change is only needed for C2H2. Here it gives C2H2 and H2

 

[romeopoomore]

👏🏻 👏🏻

👏🏻 god bless you .

Thank You . May He Bless you too

 

[romeopoomore]

But the problem is , isn’t the entalphy change is only needed for C2H2. Here it gives C2H2 and H2

In the Transformation of carbon and hydrogen to ethyne we need 2 moles of Carbon and 1 mole of hydrogen . The other mole of hydrogen is not used in the reaction and hence the change in enthalpy of that step is zero . I hope you can see in the picture

 

[Madina2410]

In the Transformation of carbon and hydrogen to ethyne we need 2 moles of Carbon and 1 mole of hydrogen . The other mole of hydrogen is not used in the reaction and hence the change in enthalpy of that step is zero . I hope you can see in the picture

thank you so much 🙏

 

[romeopoomore]

You are welcome

 

[Madina2410]

Is there any easy was to calculate isomers ? It gets so confusing. And , can anyone explain stereoisomerism ( like for the geometric one, should there be 2 same group to depict the cis and trans , or the hydrogen can be considered) ?

 

[romeopoomore]

 

[romeopoomore]

Is there any easy was to calculate isomers ? It gets so confusing. And , can anyone explain stereoisomerism ( like for the geometric one, should there be 2 same group to depict the cis and trans , or the hydrogen can be considered) ?

 

[romeopoomore]

Is there any easy was to calculate isomers ? It gets so confusing. And , can anyone explain stereoisomerism ( like for the geometric one, should there be 2 same group to depict the cis and trans , or the hydrogen can be considered) ?

Those are really helpful

 

[SzeHui]

Hi I need help for this question. Thank you !

 

[Madina2410]

can someone explain the options please ..
Thanks

 

[Filth1212]

Can someone please tell why the answer is 1 and 2 only

 

[Madina2410]

can someone please help me with this !!!!

 

[ptet.chemistry]

Hi guys, I am Mr Onn, a chemistry teacher based in Brunei. I teach A Level Chemistry based on the Cambridge International curriculum but between the different A Level examination bodies, the contents are not too different overall.



I have made some tutorial videos on tackling multiple choice questions, which can be tricky sometimes. In these hour length videos, you can skip to the relevant question(s) of interest with the chapter marker in the video description section on YouTube.



Check out my channel on YouTube. Do subscribe and like the videos to receive more great content in the future. I have plans to cover IGCSE and Ordinary Level (Cambridge International) papers too in the future.

ptet chemistry

I am Mr Onn, a chemist and a teacher. I graduated from University of Oxford, with a first class honours in Master of Chemistry (MChem), funded by the Brunei ...

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Cheers.

 

[Poseidon Potter]

Hi guys! Does anyone know how to access save my exam mark schemes for free? I really need them for practice in Chemistry (0620), Physics (0625), and Maths (0580), and my parents refused to buy them for me. Can you please help me? I will be eternally in debt if you forward them or suggest links at [email protected] Thanking you in anticipation!!

 

[Hamnah Zahoor]

Hi guys! Does anyone know how to access save my exam mark schemes for free? I really need them for practice in Chemistry (0620), Physics (0625), and Maths (0580), and my parents refused to buy them for me. Can you please help me? I will be eternally in debt if you forward them or suggest links at [email protected] Thanking you in anticipation!!

Past Papers | IGCSE | Physics 0625

pastpapers.co

just type the search words in google and you will find them all

 

[Hamnah Zahoor]

Chemistry (0620

Past Papers | IGCSE | Chemistry 0620

pastpapers.co