Chemistry p41: How'd it go peeps?

[Autumngirl]

I think it gave less CO_2 because it had a lower carbon composition? I mean, coal is basically carbon and the other fuel has long hydrocarbon chain.
For removal, I said you could pass it over an alkaline solution and (don't ask me why) due to their different condensation points. The second option should have been: "Bubble through limewater", I believe. How about you?
BTW, how did the Na2(SO4) affect the E value? I said it had no effect on any as it is just an spectator ion, but thinking back it probably had the common ion effect with the Ag, hence shifting its eq?

Yeah I wrote that longer hydrocarbons would produce more CO2 during combustion. I wrote about limewater, fractional distillation and squeezed in gas liquid chromatography as well.
Damn those electrochemistry questions! Anyway I wrote no effect for when it was added to the iron half cell because as you said spectator ion. I said it would decrease the Ecell for silver though. Again as you said common ion effect.
Btw what was the Ksp? And how did the polymers properties change when that monomer was added?

 

[randomcod]

Yeah I wrote that longer hydrocarbons would produce more CO2 during combustion. I wrote about limewater, fractional distillation and squeezed in gas liquid chromatography as well.
Damn those electrochemistry questions! Anyway I wrote no effect for when it was added to the iron half cell because as you said spectator ion. I said it would decrease the Ecell for silver though. Again as you said common ion effect.
Btw what was the Ksp? And how did the polymers properties change when that monomer was added?

I actually wrote fractional distillation BUT I changed it because they were not liquids?
Can't remember the Ksp, I remember something like 6.25 x 10 ^-5 or something like that?
And I said that it was more soluble as the -NH2 can form more Hydrogen bonds with water.

 

[Autumngirl]

I actually wrote fractional distillation BUT I changed it because they were not liquids?
Can't remember the Ksp, I remember something like 6.25 x 10 ^-5 or something like that?
And I said that it was more soluble as the -NH2 can form more Hydrogen bonds with water.

Liquify the gases before doing it? Hell, I don't know.
Got the Ksp right then. Oh that's a good point. I wrote about cross links and the polymer being more compact.

 

[randomcod]

Liquify the gases before doing it? Hell, I don't know.
Got the Ksp right then. Oh that's a good point. I wrote about cross links and the polymer being more compact.

Yeah that's right too. I think as long as you mention: solubility, compactness and m.p./b.p. due to more hydrogen bonds, I think you're fine.
Ahh the examiner will smile when he/she reads my crossing out of fractional distillation
What other qs were there which were weird?

 

[Alex10]

Liquify the gases before doing it? Hell, I don't know.
Got the Ksp right then. Oh that's a good point. I wrote about cross links and the polymer being more compact.

Wouldn't it be less compact because there are more branching points?

 

[randomcod]

Wouldn't it be less compact because there are more branching points?

I think Hydrogen bonding, because it is stronger, always makes stuff more compact?

 

[randomcod]

BTW for the third structure of C3Hx, some people drew cyclic propane.
Do you think they'd give me the mark for drawing 2 double bonds? as in CH2=C=CH2?

 

[randomcod]

Yet another q, is heat enough for cracking? Or does it need pressure?

 

[Senorita.K]

for the first question what did you guys write the formula for floride and oxygen where they said 3 atoms of flourine and oxygen...... and what was the structure of this compound?

 

[randomcod]

for the first question what did you guys write the formula for floride and oxygen where they said 3 atoms of flourine and oxygen...... and what was the structure of this compound?

F2O
Like water, v-shaped

 

[Senorita.K]

Yet another q, is heat enough for cracking? Or does it need pressure?

i wrote high temperature and high pressure

 

[Autumngirl]

Yet another q, is heat enough for cracking? Or does it need pressure?

I wrote about an Al2O3 catalyst and high temperature. I didn't know you even needed pressure for cracking.

 

[Autumngirl]

BTW for the third structure of C3Hx, some people drew cyclic propane.
Do you think they'd give me the mark for drawing 2 double bonds? as in CH2=C=CH2?

Well they did say y is variable. What you made fits the conditions they gave. I would give you the mark

 

[Abdel Moniem]

question 1 the formula i suggested AlF3 and Al2O3 i drew out AlFl3 in the dot and cross diagram, bond angle 12o degree's and a shape of a trigonal planar. The type of reaction i suggested was a displacement reaction, and the equation was FCl+KBr-->KCl+FBr, Chlorine will displace the bromine instead of the fluroine because the flourine has a strong pull on the electrons of the F-Cl bond.

 

[randomcod]

^
I'm sorry but I coincide only with the fact that it was a displacement reaction?

 

[Abdel Moniem]

^
I'm sorry but I coincide only with the fact that it was a displacement reaction?

are all my answer's in q1) incorrect?

 

[Abdel Moniem]

looks like i misunderstood the question

 

[Autumngirl]

question 1 the formula i suggested AlF3 and Al2O3 i drew out AlFl3 in the dot and cross diagram, bond angle 12o degree's and a shape of a trigonal planar. The type of reaction i suggested was a displacement reaction, and the equation was FCl+KBr-->KCl+FBr, Chlorine will displace the bromine instead of the fluroine because the flourine has a strong pull on the electrons of the F-Cl bond.

I called it a redox reaction. Cl went from +1 to -1 and br from -1 to +1.

 

[randomcod]

I called it a redox reaction. Cl went from +1 to -1 and br from -1 to +1.

I called it displacement
Did you get the same reaction? And what about the aluminium? I didn't get anything like that on mine

 

[Abdel Moniem]

randomcod i think displacement is accepted that's what happened actually cl will bond to potassium sorry cant be a redox , i am not sure?