Predictions for Chemistry 2014 HSC? (6 Viewers)

[enigma_1]

You should know it. SCN is a polyatomic ion you've seen in chem monitoring (the deducing ions prac). It was used in the confirmatory rests for one of the iron ions forgot which one.

Oh yeah That's right, coz the formula is KSCN

and K is K+ so SCN must be -1

 

[enigma_1]

yeah my bad calculated initial pH wrong lol

it's fine

 

[QZP]

You should know it. SCN is a polyatomic ion you've seen in chem monitoring (the deducing ions prac). It was used in the confirmatory rests for one of the iron ions forgot which one.

wtf i just know we added the KSCN solution to it... not necessarily have to know equations

 

[QZP]

Oh yeah That's right, coz the formula is KSCN

and K is K+ so SCN must be -1

nice. ill remember it like this hahaha

 

[enigma_1]

nice. ill remember it like this hahaha

ahah just figured out now too

 

[iStudent]

wtf i just know we added the KSCN solution to it... not necessarily have to know equations

Well the charge of it is -1 so there you have it

 

[faisalabdul16]

c1v1=c2v2

0.1 x 0.001 = c2 x 0.1

c2 = 0.001mol/L

c2v2 = c3v3

0.001 x 0.01 = c3 x 0.1

c3 = 0.0001mol/L

ph =-log (0.0001) = 4

oh gosh that's so messy, is it even right?

LaTeX hehehehe

 

[enigma_1]

LaTeX hehehehe

ahaha dis one, trying to annoy the sh*t outta me hahaha

#on my phone

 

[QZP]

I have conflict ideas on this one (the equation - so please provide one):
Explain the impact of an increase in pressure and an increase in temperature on the
solubility of carbon dioxide in water. Include a relevant equation in your answer. (3)

 

[iStudent]

*in the equation, Cr2+ should be Cr3+

 

[SuchSmallHands]

Bubble the evolved gas through water and add AgNO3, a white precipitate which blackens in sunlight indicates the presence of Cl-. (I don't do industrial, that's just from core knowledge, you might need to do something totally different. Can an industrial person please confirm?)

Anyone who does industrial on here? There were millions of you a few pages back haha

 

[faisalabdul16]

I have conflict ideas on this one (the equation - so please provide one):
Explain the impact of an increase in pressure and an increase in temperature on the
solubility of carbon dioxide in water. Include a relevant equation in your answer. (3)

It's exo, forgot to put it in.
Increasing temp = solubility of carbon dioxide decrease.
Increasing pressure = solubility of carbon dioxide increase
Using LCP

 

[enigma_1]

I have conflict ideas on this one (the equation - so please provide one):
Explain the impact of an increase in pressure and an increase in temperature on the
solubility of carbon dioxide in water. Include a relevant equation in your answer. (3)

wut

dude are you like doubting your abilities or something..?

CO2(g) + H2O(l) <-------> H2CO3(aq) delta H < O exothermic

 

[Hi there444]

I have conflict ideas on this one (the equation - so please provide one):
Explain the impact of an increase in pressure and an increase in temperature on the
solubility of carbon dioxide in water. Include a relevant equation in your answer. (3)

_/_/_

 

[Hi there444]

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Hope that can be read

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[SuchSmallHands]

I have conflict ideas on this one (the equation - so please provide one):
Explain the impact of an increase in pressure and an increase in temperature on the
solubility of carbon dioxide in water. Include a relevant equation in your answer. (3)

Equation: CO2 + H20 <---> H2CO3
Impact:
Temperature - increase will favour reactants (? can't really remember but I think most gasses have exothermic dissolution?)
Pressure - increase will favour products

 

[QZP]

LOL gg im dead band 4. I was thinking of CO2(g) <--> CO2(aq) is this even true?

 

[Hi there444]

Anyone who does industrial on here? There were millions of you a few pages back haha

Yes that's right.

_/_/_

 

[enigma_1]

_/_/_

w0t is that?

 

[iStudent]

*in the equation, Cr2+ should be Cr3+

What is the oxidation state of molybdenum in the ion [Mo2O4(SCN)6] 4-
the numbers in the brackets are supposed to be below. 4- is the total charge

.