Chemistry: Post your doubts here!

[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.



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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!!

Physics 0625 | IGCSE | PastPapers - PastPapers.Co

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

 

[Hamnah Zahoor]

Chemistry (0620

Chemistry 0620 | IGCSE | PastPapers - PastPapers.Co

Browse CAIE IGCSE Chemistry 0620 past papers, mark schemes, and examiner reports. Download PDF resources for free.

pastpapers.co

 

[mustafa5255]

Re: All Chemistry help here!! Stuck somewhere? Ask here!

Assalamoalaikum!!

first post updated!

Please help!

 

[Hamnah Zahoor]

Please help!

is option A correct answer?

 

[Madina2410]

can someone explain why the answer is 60 instead of 30?

 

[Hamnah Zahoor]

View attachment 65305
can someone explain why the answer is 60 instead of 30?

At this temperature water also exist as gas so also add up the volume of water.