Biology; Chemistry; Physics: Post your doubts here!

[legion]

No ! .. nor are any other Ionic/Covalent compounds .. the only diatomic elements are those elements which end in -gen ( that's how i remember it)

-Halogens
-Nitrogen N2
-Oxygen O2
-Hydrogen H2

The compounds containing these elements are not diatomic either .. only these elements exist in diatomic form.

Like Potassium exists as K in nature , similarly Nitrogen and other diatomic elements occur in N2 form instead of N.


Depends on the way which that word is used really .. Diatomic can also mean a compound containg 2 atoms .. in which case what you have written will be correct , but i don't think the question which snowboard asked would be about that.


PS: I have edited my post to change it , thanks glamgurl for pointing it out

umm thanks. i didnt know this -gen rule.. thankee

 

[syed1995]

umm thanks. i didnt know this -gen rule.. thankee

well i don't know if any such rule exists or not .. but that's the way i remember the names of these elements

 

[legion]

well i don't know if any such rule exists or not .. but that's the way i remember the names of these elements

hmmm okie.

 

[daredevil]

as we go deep its does become difficult!!!!so this why i asked.

Suit urself ... i find it pretty interesting btw so i have learnt it

 

[Birdie Honey]

Suit urself ... i find it pretty interesting btw so i have learnt it

okay!!

 

[Vogue]

http://www.xtremepapers.com/CIE/Cambridge O Levels/5054 - Physics/5054_s11_qp_41.pdf
Question 3 part a of phy atp may june 11, qp 41
PLEASE help!​

 

[multixamza01]

http://www.xtremepapers.com/CIE/Cambridge O Levels/5054 - Physics/5054_s11_qp_41.pdf​

Question 3 part a of phy atp may june 11, qp 41​

PLEASE help!​

Attach the newton meter with the block by a string. let the block remain in it's positon and allow the newtonmeter to hang by the edge of the table. Use different waits on the newton meter i.e 0.1 N, 0.5 N, 1 N, 5 N and measure the distance the block moves for each. The weight that produces the slightest moment is the minimum force required to move the block.

 

[scouserlfc]

so if the question doesn't specify whether the solution is dilute or concentrated , we assume it to be concentrated . Is that right?

Yes we do ! ! i got to know this from one of my friends who goes to a well known teacher of chemistry so its 100% correct

No we always assume that it is dilute , we only consider it to be concentrated if it's mentioned that it's concentrated.

No if it says aqueous u will use the concentrated selective discharge to identify the elements on each electrode

 

[scouserlfc]

Those aren't in the book....if you can pls

What book do u have it should be there it might not be under a seperate heading but mixed with other stuff

 

[aleezay]

Biology s02 n s03 marking schemes anybdyyyyy?

 

[snowbrood]

well can anyone answer this question my teacher gave me this as a challenge?? Q A cylindrical steel shaft of radius 2cm and long is turned upside down on a lathe to one half its radius for a distance of 20cm from one end find the distance of its centre of gravity from the thicker end.?

 

[legion]

sounds like a maths question to me .. wrong thread dude ..

sounds physics....

 

[sweetiepie]

For Notes check here

http://www.xtremepapers.com/community/threads/olevel-notes-center.11138/

 

[hassan100]

Yes we do ! ! i got to know this from one of my friends who goes to a well known teacher of chemistry so its 100% correct



No if it says aqueous u will use the concentrated selective discharge to identify the elements on each electrode

yeah you are ryte if it is not mentioned then alwayz consider it as concentrated, it was confirmed in a cmabridge workshop

 

[SalmanPakRocks]

yeah you are ryte if it is not mentioned then alwayz consider it as concentrated, it was confirmed in a cmabridge workshop

If the solution is concentrated than the word 'concentrated' is mentioned.

 

[snowbrood]

well can anyone answer this question my teacher gave me this as a challenge?? Q A cylindrical steel shaft of radius 2cm and long is turned upside down on a lathe to one half its radius for a distance of 20cm from one end find the distance of its centre of gravity from the thicker end.?

anyone that could help me with my question?

 

[scouserlfc]

If the solution is concentrated than the word 'concentrated' is mentioned.

yeah it is mentioned but here we are talking abt if it just says aqueous solution then selective discharge occurs of anions like in concentrated media ! !

anyone that could help me with my question?

difficult question

 

[multixamza01]

Biology s02 n s03 marking schemes anybdyyyyy?

marking schemes were published after 2004. before s2004 CIE kept them secret.

 

[scouserlfc]

marking schemes were published after 2004. before s2004 CIE kept them secret.

really i remember seeing the ms for 2002 and 2003 before the papers were removed to accomodate the recent papers !

 

[SalmanPakRocks]

@ ALL: Marking Schemes were made before 2004 and infact even in the 90's. Yet CIE didn't find appropriate to publish them then. If you want them, just buy them from the CIE. (Isn't that costly either)