Biology; Chemistry; Physics: Post your doubts here!

[Ahmedfj]

never mind its the cleaning process of the aluminium ore!

hey wats froth flotation ??

 

[Spidey21]

hey wats froth flotation ??

thats bio isnt it?
fermentation k baad froth ban jate hai..
wo jab float karte hai to usko froth floatation bolte hain
i guess!!

 

[Spidey21]

hey wats froth flotation ??

my previous thread is EPICLY WRONG!
this is what i got!!
Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in several processing industries. Historically this was first used in the mining industry.

 

[syed1995]

thats bio isnt it?
fermentation k baad froth ban jate hai..
wo jab float karte hai to usko froth floatation bolte hain
i guess!!

Delta H = ?

 

[Spidey21]

Delta H = ?

change in H which is heat...also known as Enthalpy change!!

 

[syed1995]

my previous thread is EPICLY WRONG!
this is what i got!!
Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in several processing industries. Historically this was first used in the mining industry.

which thread ?

 

[Spidey21]

which thread ?

sorry post!!

 

[syed1995]

change in H which is heat...also known as Enthalpy change!!

no the formulae .. negative when exo positive when endo ?

 

[syed1995]

no the formulae .. negative when exo positive when endo ?

I meant the opposite .. lol

 

[Ahmedfj]

no the formulae .. negative when exo positive when endo ?

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_w11_qp_11.pdf

mcq 1 answer plus explanation please ASAP !!!!

 

[syed1995]

http://www.xtremepapers.com/papers/...l O Level/Chemistry (5070)/5070_w11_qp_11.pdf

mcq 1 answer plus explanation please ASAP !!!!

C .. is it correct ?

 

[Ahmedfj]

C .. is it correct ?

B hai yaar

 

[syed1995]

B hai yaar

Iska asal answer wesay .. Rinse with Distilled Water then with the solution (acid hoga) .. Kabhi tap water say nai dhootay .. aur Alkali say sawal hi paida nai hota .. tu akela logical answer B bucha ...

 

[Ahmedfj]

Iska asal answer wesay .. Rinse with Distilled Water then with the solution (acid hoga) .. Kabhi tap water say nai dhootay .. aur Alkali say sawal hi paida nai hota .. tu akela logical answer B bucha ...

u said k tap water se nahi dhotay tou B mai tou tap water se he dho rahay hain

 

[syed1995]

pta nai .. kia logic lgayi hai inhoone yahan .. but baqi saray incorrect hain .. because use of Distilled water is a must before adding the solution!

Spidey21 around?

 

[Ahmedfj]

pta nai .. kia logic lgayi hai inhoone yahan .. but baqi saray incorrect hain .. because use of Distilled water is a must before adding the solution!

Spidey21 around?

1st one shuld be right coz flask mai alkali daalna hai so first distilled water and then alkali

 

[secret lover]

chemistry help!!! nov/oct 2006 question 5(d) paper 3...plz IMPORTANT!!!!!!!!!!!!!

 

[syed1995]

1st one shuld be right coz flask mai alkali daalna hai so first distilled water and then alkali

wrong answer aayega phir .. anyways mein samjha burette saaf kar rahay hain!!! ye tu flask saaf horaha hai

B hi sahi answer hoga ..

Tap water say karo gay pahlay .. phir distilled water say ..

Agar ending mein Acid daal diya .. tu Alkali already react hojayega thora sa .. aur kam acid chahiye hoga reaction kay liye .. aur incorrect results aayeingay ..

Agar ending mein Alkali daal diya .. tu Alkali ka amount barh jaayega .. aur ziyada acid chahiyee hoga reaction kay liye .. aur incorrect results aayeingay!!!

 

[syed1995]

chemistry help!!! nov/oct 2006 question 5(d) paper 3...plz IMPORTANT!!!!!!!!!!!!!

CaOH wala ??

(i) Calcium Hydroxide + Hydrochloric Acid --> Calcium Chloride + Water
(ii) H+ + OH- --> H2O

 

[syed1995]

iam talkin abt chemistry IGCSE

You are in O Levels thread ..