Biology; Chemistry; Physics: Post your doubts here!

[muaz_ali]

Silver nitrate is an acid or a base ? or what type of compound is it ?

It is a salt that, ofcourse ionic. Made by titration.

 

[Anonymous-BLEH!]

Wind speed and mass

I think its wind and surface area..

how about physical contact on the way down???

 

[Anonymous-BLEH!]

hey does anyone know if 'momentum' is included in the cie o level physics examination?? (momentum = mass*velocity)

 

[muaz_ali]

Why does resistance does not affect the size of induced EMF? anyone?

 

[Lana19984]

Why does resistance does not affect the size of induced EMF? anyone?

https://evantoh23.wordpress.com/2012/11/09/induced-emf-not-affected-by-resistance-of-wir/

 

[Lana19984]

Acid base indicators

Indicators are used to identify acids and bases.

Indicators can be obtained from berries and other fruits.

Plan an experiment to obtain an aqueous solution of an indicator from some berries.???????????????????????????

 

[muaz_ali]

Acid base indicators

Indicators are used to identify acids and bases.

Indicators can be obtained from berries and other fruits.

Plan an experiment to obtain an aqueous solution of an indicator from some berries.???????????????????????????

why would you even?
the last thing with berries you can do is use them as a indicator. That's plain disrespect to food.

 

[Lana19984]

why would you even?
the last thing with berries you can do is use them as a indicator. That's plain disrespect to food.

please do ask IGCSE CHEMISTRY examiners why its a past paper question

 

[Alpha Destro]

At the end of a titration the solution is supposed to be neutral RIGHT?

 

[Anonymous-BLEH!]

momentum!!!??? is it included in physics???

 

[Alpha Destro]

momentum!!!??? is it included in physics???

Nope , that question you have in your mind from that 2014 paper ,its abt inertia not momentum . momentum is NOT in our syllabus.

 

[Anonymous-BLEH!]

Nope , that question you have in your mind from that 2014 paper ,its abt inertia not momentum . momentum is NOT in our syllabus.

okay thanks a lot

 

[Anonymous-BLEH!]

which indicators are included in our syllabus for chemistry??

 

[Anonymous-BLEH!]

list solubility of oxides and hydroxides needed!!

 

[Umna.Asim]

Hi
Okay so I wanna know if there is some table or something to learn the appearances of the metals and their oxides. Because I mess up in that part. Pleas help.

 

[Umna.Asim]

which indicators are included in our syllabus for chemistry??

Phenolphthalein, Methyl Orange, litmus, universal imdicator.
These are usually the main ones, they might tell about the color changes if they use any other indicator.

 

[Alpha Destro]

Can some explain to me what is wrong with the question 11 part g ) 2)
http://maxpapers.com/wp-content/uploads/2012/10/5070_w14_qp_41.pdf
If final temperature is 90 how is it not possible EH!?

 

[Anonymous-BLEH!]

Can some explain to me what is wrong with the question 11 part g ) 2)
http://maxpapers.com/wp-content/uploads/2012/10/5070_w14_qp_41.pdf
If final temperature is 90 how is it not possible EH!?

the student is using a hydrocarbon with 7 carbon atoms so basically the temperature rise would be more than 100.... as a result, it will not fit in the graph and it will be difficult to measure it as well.. at least this is what i think the answer is...

 

[muaz_ali]

(ii) final temperature would exceed the boiling point of water/100°C (1) [1] as said by the markin scheme.

 

[Alpha Destro]

(ii) final temperature would exceed the boiling point of water/100°C (1) [1] as said by the markin scheme.

I think i already said that if final twmp. is 90 how is it not possible, 90*C does not exceed boiling point of water , read the whole question not just the marking scheme GENIUS