Predictions for Chemistry 2014 HSC? (1 Viewer)

[enigma_1]

Do I put a square bracket [ ]n around the 3 monomers? Or the middle one

Around all 3 of them

 

[faisalabdul16]

Everyone know how to draw cellulose?

 

[QZP]

Alternating b-glucose monomers

 

[QZP]

Urgent industrial Q: how do we model the first part of the Solvay process? (Co2 bubbled through ammoniated brine)

 

[emilios]

Urgent industrial Q: how do we model the first part of the Solvay process? (Co2 bubbled through ammoniated brine)

mix 10ml of concentrated ammonia (30%) with 10ml brine in a 100ml beaker. add 10g of ammonium chloride and mix thoroughly until no dissolves. decant the clear solution into a conical flask. add dry ice to the flask and allow it to sublime. should get some NaHCO3 precipitate

 

[IR]

You know how the half-cells are equilibrium reactions?

<img src="http://latex.codecogs.com/gif.latex?Cu^{2+}+2e^{-}\rightleftharpoons&space;Cu" title="Cu^{2+}+2e^{-}\rightleftharpoons Cu" />

That wouldn't happen in Galvanic cell. It a straight one way direction unless energy from another external circuit eg. a generator or a battery is supplied.

 

[IR]

mix 10ml of concentrated ammonia (30%) with 10ml brine in a 100ml beaker. add 10g of ammonium chloride and mix thoroughly until no dissolves. decant the clear solution into a conical flask. add dry ice to the flask and allow it to sublime. should get some NaHCO3 precipitate

Since its from ahmed's notes, it must be right ^. Also I dont get how you got the CO3- ion from nowhere?

 

[emilios]

Since its from ahmed's notes, it must be right ^. Also I dont get how you got the CO3- ion from nowhere?

it's a HCO3- ion. dry ice is CO2.

CO2 + H2O <---> H2CO3
H2CO3 + NH3 <---> HCO3- + NH4+

 

[IR]

it's a HCO3- ion. dry ice is CO2.

CO2 + H2O <---> H2CO3
H2CO3 + NH3 <---> HCO3- + NH4+

Thanks

 

[Queenroot]

He even has root in his name, what more could you want?

yeah tbh

 

[Squar3root]

yeah tbh

that bump tho