CHEM AND BIO HELP AND TIPS HERE

[holtadit]

Another quickie..


would Gold react with conc. H2SO4 ?? I think so.

[Amr Fouad]

Another quickie..


would Gold react with conc. H2SO4 ?? I think so.

No it would not...Any metal below copper in the reactivity series, including copper itself, would not react with an acid as they are extremely nonreactive...and it doesnt matter whether the acid is concentrated or not....However, dont confuse metals with their oxides..Copper oxide can react with acids..

[Amr Fouad]

Excellent explanation. I completely understood.


+rep

glad i helped 

[Amr Fouad]

thanks amr

anytime...Sorry for answering the question  ..i know u rock at chemistry..but i just wanted to help

[saleemsamer]

hey nid
do u have a good resource for the topic of The Mole Concept.
these qs in the exam drive me crazy.
Also The equilibrium concept
thx in advance

[nid404]

anytime...Sorry for answering the question  ..i know u rock at chemistry..but i just wanted to help

lol...I need help...I have to many questions to answer.. Happy to get a helping hand

[nid404]

hey nid
do u have a good resource for the topic of The Mole Concept.
these qs in the exam drive me crazy.
Also The equilibrium concept
thx in advance

check the attachment 
This should be enough

[Dark Prince]

1.) I think your refering to the electrolysis of conc. NaCl. The membrane allows Na+ ions to move to the right of the  cell to meet OH- ions
2.) Its both. In an exam you give any as your answer. The Zn displaces Cu from its salt at the same time losing 2 electrons to Cu2+ to form    Cu metal.
3.) ill be back...

Why doesnt the OH ions move towards anode while da Na ions move 2ward cathode.......How does da membrane only allows Na 2 pass thru..?

[DEGO]

Why doesnt the OH ions move towards anode while da Na ions move 2ward cathode.......How does da membrane only allows Na 2 pass thru..?

membrane allow small particles and ions only  which is hte NA ions thts all

[DEGO]

Hi, iwant 2 ask a few Qs

1. what is de main function of porus membrane in a membrane cell (electrolysis)
2. Is this a redox or displacement reaction....Zn + CuSO4 -- ZnSO4 +Cu  ?
3. How does afuel cell worf (hydrogen nd O2)?

3)the combustion of hydrogen(by oxygen) produce energy +water 
2H2-4e=4H+    (oxidation)
4H+  + O2  + 4e  = 2h2o  (reduction)
so the overall is 
2h2+ o2  = 2H2O

[khaled bugs]

needhelp plzzz on bio nervous system espicially source of relay nuerons and all the nuerons

[DEGO]

needhelp plzzz on bio nervous system espicially source of relay nuerons and all the nuerons

check dr.mervat u ll find it khaled

[nid404]

http://www.medtropolis.com/VBody.asp

check this khaled

[holtadit]

In the Daniel Cell there is an electrolyte of Copper Sulphate (blue in colour ??).

When the cell starts up does the blue colour of the electrolyte fade until it becomes colourless and the cell stops working ?

[DEGO]

In the Daniel Cell there is an electrolyte of Copper Sulphate (blue in colour ??).

When the cell starts up does the blue colour of the electrolyte fade until it becomes colourless and the cell stops working ?

what are the electrodes??? the answer depends on this