Physics, Chemistry and Biology: Post your doubts here!

[DANISH182]

The reactant(substance) in a reaction which is in a limited supple hence limiting the time of the reaction. For example, a plant has very low water.. When all the water will be used up by the plant,there will be no more..right? So photosynthesis will automatically stop.
So in this case WATER is a limiting reactant ..Hope this helps you

but how to calculate it with moles

 

[Sariya Khan]

but how to calculate it with moles

Provide me with a question so that I can help you. as I gave my Chemistry exam last year!

 

[ThePacifics]

Can anyone tell me if we have Cyclic Hydrocarbons in this years Chemistry 0620 syllabus?

 

[XxChampXx]

Provide me with a question so that I can help you. as I gave my Chemistry exam last year!

Is it hard to get an A*?

 

[Sariya Khan]

Is it hard to get an A*?

Not really but you have to exert yourself enough to know all the concepts!

 

[Bah...]

Take a look at these notes (https://www.xtremepapers.com/community/threads/all-things-u-need-to-know-about-chemistry-p6.33395/)
they'll will help you for revision and after revising the things try solving the past papers and time yourself.

I didn't get a chance to reply earlier. Thank u soooo much! <3

 

[Saad the Paki]

Can anyone tell me if we have Cyclic Hydrocarbons in this years Chemistry 0620 syllabus?

Well they have never been in the syllabus..
However questions related to it might be asked

 

[Saad the Paki]

Will Concentrated HCl and Dilute HCl have the same pH?

 

[shingiechingz@8]

how do we test that something is Amphoteric ?

 

[shingiechingz@8]

Will Concentrated HCl and Dilute HCl have the same pH?

yes they do have the same pH
what differs is the number of solute dissolved in 1dm3 of a solvent(water). In simpler terms they differ in concentration

 

[shingiechingz@8]

guys need help with question #3(a)(ii)

 

[Sariya Khan]

how do we test that something is Amphoteric ?

It will react with acid as well as base !

 

[masterex567]

guys need help with question #3(a)(ii)

the diagram shows cyclobutane.
So they want an isomer, you can draw the structure of 1-butane for example.

 

[skyangel]

need to convert kg to newton should I divide 60kg to 10 to convert it in newton

Its alright In Sha Allah it won't happen again.

 

[XxChampXx]

need to convert kg to newton should I divide 60kg to 10 to convert it in newton

1 kg is 10 newtons. Thus, 60 kg is 600 newtons so you have to multiply the mass by 10.

 

[Saad the Paki]

yes they do have the same pH
what differs is the number of solute dissolved in 1dm3 of a solvent(water). In simpler terms they differ in concentration

But...but...my book says differently....
I mean obviously if UI gives different colours that means different pH

 

[Saad the Paki]

no i dont think so

So every1 has different opinions ..
R u sure

 

[Abdurrahmanmuhammed]

So every1 has different opinions ..
R u sure

Lol no they have the same ph i deleted that comment

 

[Abdurrahmanmuhammed]

Lol no they have the same ph i deleted that comment

but i still doubt it cause dil hcl will have lesser concentration of H+ ions

 

[ThePacifics]

thnks

Well they have never been in the syllabus..
However questions related to it might be asked

... i know but in 2013 past papers there r some detailed questions about it... which are not mentioned in cambridge books... anyways thanks