Biology; Chemistry; Physics: Post your doubts here!

[bogus]

Can you please explain this question as well?

 

[smiling star]

What is a circuit breaker and what is meant by circuit breaker settings?
I'm so confused in this
Please someone post up any notes or links in connection with this topic, thanks:')

 

[smiling star]

View attachment 58756Can you please explain this question as well?

According to the reactivity series, check that out.

 

[Error Syntax]

View attachment 58756Can you please explain this question as well?

This question is of course related to the reactivity series but what the question is asking is that define the reactivity of these elements depending upon its OXIDE stability , CO2 , AL2O3 and Fe2O3. According to the reactivity series Aluminium oxide can only be broken through electrolysis. which makes it quite reactive , still on the other hand Iron oxide can reduced or broken by heating with Carbon / Carbon monoxide/hydrogen. Carbon on the other hand is quite reactive towards oxygen as if have seen through reactions such as carbon monoxide and carbon dioxide CO and CO2 and they are not that easily broken. So according the information i have provided above the answer is A. Carbon rules over most of the elements when we talk about Oxygen due to its formation with it. Hope you understood.

 

[bogus]

This question is of course related to the reactivity series but what the question is asking is that define the reactivity of these elements depending upon its OXIDE stability , CO2 , AL2O3 and Fe2O3. According to the reactivity series Aluminium oxide can only be broken through electrolysis. which makes it quite reactive , still on the other hand Iron oxide can reduced or broken by heating with Carbon / Carbon monoxide/hydrogen. Carbon on the other hand is quite reactive towards oxygen as if have seen through reactions such as carbon monoxide and carbon dioxide CO and CO2 and they are not that easily broken. So according the information i have provided above the answer is C. Carbon rules over most of the elements when we talk about Oxygen due to its formation with it. Hope you understood.

Yeah. Thanks A LOT!

 

[smiling star]

Are the steps of cell division same thing as cell cycle

 

[kevindu]

can the general fornulae of alcohols be written as CnH2n+2O

 

[bogus]

can the general fornulae of alcohols be written as CnH2n+2O[/QUOTE
No. You can use it to help yourself though.

 

[bogus]

u

Are the steps of cell division same thing as cell cycle

uhh....what?

 

[bogus]

It's no longer a part of our syllabus if I am not wrong...

What is a circuit breaker and what is meant by circuit breaker settings?
I'm so confused in this
Please someone post up any notes or links in connection with this topic, thanks:')

 

[Miral Lovato]

Hi, are there any other books (or websites) from where i can do more practice questions for physics and chemistry, other than those redspot past papers, i want to do more to confirm my preparation.

 

[Error Syntax]

Hi, are there any other books (or websites) from where i can do more practice questions for physics and chemistry, other than those redspot past papers, i want to do more to confirm my preparation.

You can use IGCSE PAPERS mostly of the Extended part ... they are good for practice and I mostly recommend them. you can get them at GCE GUIDE and each invariant is a whole lot different.

 

[Miral Lovato]

You can use IGCSE PAPERS mostly of the Extended part ... they are good for practice and I mostly recommend them. you can get them at GCE GUIDE and each invariant is a whole lot different.

okay thanks.

 

[smiling star]

Simone pls explain why the hell we use glass beads in a fractional ting column it's so confusing I don't understand
And can anybody give me notes for crystallization pls pls

 

[smiling star]

Hi, are there any other books (or websites) from where i can do more practice questions for physics and chemistry, other than those redspot past papers, i want to do more to confirm my preparation.

Um for math add math go for the variants as many as you can
For Chem if suggest fundamental chemistry qs and worksheets from simple Chemconcepts site
For physics and bio long man workbook would suffice
Don't worry past papers are enough bye I'm surprised you're done with them so quick Ma Sha Allah I haven't even completed my syllabus yet :/

 

[Shreyas Bhutra]

Some more sites for books(igcse) except GCE guide

 

[Error Syntax]

Simone pls explain why the hell we use glass beads in a fractional ting column it's so confusing I don't understand
And can anybody give me notes for crystallization pls pls

We mostly use glass beads because they are nonreactive and they are inert. It is to prevent the liquid from reacting with the column to produce another compound.

 

[delta.charlie321]

A small cylinder of compressed helium gas is used to inflate balloons for a celebration.

(b) The helium in the cylinder has a volume of 6.0 × 10–3 m3 (0.0060 m3) and is at a pressure of 2.75 × 106 Pa.

(i) The pressure of helium in each balloon is 1.1 × 105 Pa. The volume of helium in an inflated balloon is 3.0 × 10–3 (0.0030 m3). The temperature of the helium does not change.

Calculate the number of balloons that were inflated.

I know how the calculation is done for this question using p1v1=p2v2 but my question is how can you equate the pressure and the volume of both systems if the mass of helium in both system is not equal?

 

[Miral Lovato]

Um for math add math go for the variants as many as you can
For Chem if suggest fundamental chemistry qs and worksheets from simple Chemconcepts site
For physics and bio long man workbook would suffice
Don't worry past papers are enough bye I'm surprised you're done with them so quick Ma Sha Allah I haven't even completed my syllabus yet :/

okayy thanks im doing it private thats why i have completed my syllabus about a year ago

 

[smiling star]

Can any body provide me notes or a link to any resourceful site for radioactivity In physics?
I'd be very thankful