How many marks would I get for this? (3 Viewers)

[Rawf]

Haha too many equations, know all except solvay process.

Aww. I find al the equations simple to remember just remember the 4 steps!
1. brine purification
Ca2+ + CO3 2- --> CaCO3 (s)
2. NaHCO3 formation (all balances)
NaCl (brine duh!) + CO2 + NH3 + H2O --> NaHCO3 + NH4Cl
3. Na2CO3 formation (burn the nahco3)
2NaHCO3 --> Na2CO3 + H2O + CO2
4. Ammonia recovery
I Cbs to right out the equation for this cause I'm on my phone haha but.. add the CaO from burning CaCO3 to water to form Ca(OH)2
Then react Ca(OH)2 to NH4Cl (formed in step 2) and it'll form ammonia, calcium chloride and water

Pretty straight forward try write them out everyday.. that's how I remembered my battery equations
Goodluck!

 

[ellie95]

Aww. I find al the equations simple to remember just remember the 4 steps!
1. brine purification
Ca2+ + CO3 2- --> CaCO3 (s)
2. NaHCO3 formation (all balances)
NaCl (brine duh!) + CO2 + NH3 + H2O --> NaHCO3 + NH4Cl
3. Na2CO3 formation (burn the nahco3)
2NaHCO3 --> Na2CO3 + H2O + CO2
4. Ammonia recovery
I Cbs to right out the equation for this cause I'm on my phone haha but.. add the CaO from burning CaCO3 to water to form Ca(OH)2
Then react Ca(OH)2 to NH4Cl (formed in step 2) and it'll form ammonia, calcium chloride and water

Pretty straight forward try write them out everyday.. that's how I remembered my battery equations
Goodluck!

Thanks heaps. Can you also give me the equations for dry and battery cell please

 

[someth1ng]

NINJA STEAL THREAD...I dunno how to mark this question myself...2010 HSC

 

[Rawf]

Thanks heaps. Can you also give me the equations for dry and battery cell please

For dry cell:
Electrolyte - NH4Cl/ZnCl2 paste
Anode: Zn(s) --> Zn2+(aq) + 2e-
Cathode: 2MnO2(s) + 2NH4+ --> Mn2O3(s) + H2O (l) + 2NH3 (g)

For silver button cell:
Electrolyte - KOH/Zn(OH)2
Anode: Zn(s) + 2OH-(aq) --> Zn(OH)2(aq) + 2e-
Cathode: AgO(s) + H2O(l) + 2e- --> 2Ag(s) + 2OH-(aq)

View attachment 26606

NINJA STEAL THREAD...I dunno how to mark this question myself...2010 HSC

Not a bad answer. Do you have the success one book? they have suggested answers.. i think that was pretty similar to it (i did it a while ago lolol)
You could also mention that higher BOD can lead to less DO (inverse relationship)

 

[someth1ng]

Not a bad answer. Do you have the success one book? they have suggested answers.. i think that was pretty similar to it (i did it a while ago lolol)
You could also mention that higher BOD can lead to less DO (inverse relationship)

Yeah, that's something nice to put in, thanks mate

 

[ellie95]

For dry cell:
Electrolyte - NH4Cl/ZnCl2 paste
Anode: Zn(s) --> Zn2+(aq) + 2e-
Cathode: 2MnO2(s) + 2NH4+ --> Mn2O3(s) + H2O (l) + 2NH3 (g)

For silver button cell:
Electrolyte - KOH/Zn(OH)2
Anode: Zn(s) + 2OH-(aq) --> Zn(OH)2(aq) + 2e-
Cathode: AgO(s) + H2O(l) + 2e- --> 2Ag(s) + 2OH-(aq)


Not a bad answer. Do you have the success one book? they have suggested answers.. i think that was pretty similar to it (i did it a while ago lolol)
You could also mention that higher BOD can lead to less DO (inverse relationship)

Thanks heaps for giving the equations