Physics, Chemistry and Biology: Post your doubts here!

[❤Nouran❤]

Hello everyone, I need some help, can anyone please give me notes for Physics, Chemistry and Biology, thanks

Here are some I use. Hope they r beneficial

 

[Agent 47]

Here are some I use. Hope they r beneficial

thank you very much sir I really appreciated, god bless you

 

[Agent 47]

mole=volume x concentration
volume=mole x 24


4(c)(i) 0.002 (mol); 0.1 x 0.02dm3 (e.g 20cm3/1000)
4(c)(ii) 0.001 (mol); 0.002/2 (becuz its 2H2O2:1O2 SO 2:1)
4(c)(iii) 0.024 (dm3); 0.001 x 24
4(c)(iv) no change/ no effect; (as catalysts don't affect equilibrium and thus the volume of the reactants-it just speeds up the reaction)
4(c)(v) 0.048 (dm3 ); 0.024 x 2 (as concentration is doubled )-e.g 0.1mol/dm3 x 2 = 0.2 mol/dm3

Hope it helps
Good luck!

Thank you very much sir, for helping me again, god bless you

 

[Agent 47]

hey guys need some help in this question, thanks in advance

 

[Agent 47]

And I had some difficulties in this question too, can someone please help, well thanks in advance

 

[Agent 47]

and how do we do this too, thanks is advance

 

[Agent 47]

and suggestion for this question, well thanks in advance

 

[azfarhassan772]

All the circled questions

 

[azfarhassan772]

Can any share biology as level notes, that are not of z notes

 

[oathbreakerxo]

th

Can any share biology as level notes, that are not of z notes

this is the group for o level... brother you're in the wrong group

 

[Agent 47]

th

this is the group for o level... brother you're in the wrong group

Thanks for the advice but my exams are done, and I am done with IGCSE, joining O levels soon (lol)

 

[Pieeater]

Assalam-o-Alaikum.
Post your Physics, Chemistry and Biology doubts in here and members, along with me will try their best to help you out. Answers for biology igcse save my exams 4.biological molecules

 

[Thato Kapeso]

Here are some I use. Hope they r beneficial

Thank you so much

 

[Unknown202]

Can someone explain what he means by answer ci and cii?

 

[Muhammad Shamoeel]

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[Dantalian1506]

can someone help me find the year and month for biology, Its paper 1 .
Igcse pearson.
i cant find this jaguar anywhere ...
i want the markscheme for it

 

[Madina2410]

Hey , can someone explain the first and second point from this question

 

[AliveDude905]

hey guys
can someone help with this problem?
High pressure will increase the yield of SO3. why the reaction is carried at atmospheric pressure in the contact process?

 

[Hamnah Zahoor]

hey guys
can someone help with this problem?
High pressure will increase the yield of SO3. why the reaction is carried at atmospheric pressure in the contact process?

Even at relatively low pressures, there is a 99.5% conversion of sulphur dioxide into sulphur trioxide. The very small improvement that you could achieve by increasing the pressure isn't worth the expense of producing those high pressures.

 

[Rodrigo Layton]

Assalam-o-Alaikum.
Post your Physics, Chemistry and Biology doubts in here and members, along with me will try their best to help you out.

I wanna be cool in chemistry. What are the best ways?