Biology; Chemistry; Physics: Post your doubts here!

[khizer shahab]

22-C as the oxide of X is a catalyst so from the periodic table its Mn
23-A i guess coz grp 1 metals have low densities

thnaks for 22 but..............23's answer in marking scheme is D ..!! but WHY?

 

[A star]

22-C as the oxide of X is a catalyst so from the periodic table its Mn
23-A i guess coz grp 1 metals have low densities

u stole my ans

 

[bogus]

i am sure about the method but dunt write it in titration cuz all ms include the repeating point

i know its just that u dont know about cie . They can give u anything?

 

[A star]

thnaks for 22 but..............23's answer in marking scheme is D ..!! but WHY?

sodium is least dense and one of the least melting points

 

[A star]

sodium is least dense and one of the least melting points

+ even diamond iron melts at 1500

 

[malay]

u stole my ans

well..daz my luv for chem

 

[A star]

well..daz my luv for chem

lolz hmm lets see on 13th

 

[malay]

lolz hmm lets see on 13th

Q..13th ko kia ha???

 

[ISFSAT]

Q..13th ko kia ha???

Result.............

 

[malay]

Result.............

k m positive

 

[malay]

rules related to isomers and their structure...any idea???

 

[khizer shahab]

28-D as all the others are base or alkalis
do tell da right ans...

correct and thanks

 

[areeba fatima]

Explain how pathways with lower activation energies account for the increase in speeds of reactions?

 

[khizer shahab]

rules related to isomers and their structure...any idea???

a hydrogen atom at carbon can slide to side from bottom or to top , isomer is made in such a way that even if they slide they cannot make the same position !!

hoped understand !!

 

[Translucent231]

no A

The air diffuses out of the pot and the Hydrogen diffuses into the pot, since H2 has a very low Mr, It will diffuse faster into the pot thus increasing the pressure exerted on the water (because there are a lot of particles there), the air will continue diffusing out slowly and later both air and H2 will be evenly spread out which will cause the water level to return to normal.

 

[khizer shahab]

Explain how pathways with lower activation energies account for the increase in speeds of reactions?

needs lower energy therefore the time required to gain energy becomes less thus reaction speeds up !!

 

[areeba fatima]

needs lower energy therefore the time required to gain energy becomes less thus reaction speeds up !!

Thank you...i was thinking the same

 

[kitecrystal]

q8,12,26,40​

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[khizer shahab]

q8,12,26

8 A

 

[kitecrystal]

what is difference b\w condensation and addition polymers?