Some Fine Tuning

[danielf]

When the question says complete combustion, do we show a full arrow (rather than the reversible ones)? Also, are the last two sulfuric acid reactions reversible or do they go to completion? Insight says completion but my teacher says reversible???
And another question:
Insight 2008 M/C Q4:
Which of the following changes will always ensure an increase in the rate of a chemical reaction?
I: Adding a catalyst, II: IncreasingTemp, III:Increasing conc, IV: Increase surface area of reactant
My answer was (D): All four of them but the answer says it is only the first three then offers no decent explanation for my surface area wtfness. Plz help...

[bec]

I could be wrong with these things, but I'd say:
- Complete comubstion means complete reaction, so full arrow
- First sulfuric acid reaction is virtually complete (full arrow) and the next two need double arrows
- The key word here is always . (I got this Q wrong the first time too)...Not all reactants even have surface areas (if they are gases, for example), and also, if the surface area of a reactant is increased but not amount of contact reactant particles have with each other, the amount of collisions/rate of reaction will remain unchanged. So even though increases surface area usually increases ROR, it doesn't always...

Hope this helps

[onlyfknhuman]

Burner -  one arrow
Converter - double arrow
Absorption Tower - one arrow
Diluter - one arrow

Im 100 percent this is the case, as the 1st 3rd and 4th reactions are almost complete reactions.

[bec]

Burner -  one arrow
Converter - double arrow
Absorption Tower - one arrow
Diluter - one arrow

Im 100 percent this is the case, as the 1st 3rd and 4th reactions are almost complete reactions.

Sorry sorry I misinterpreted, I was thinking danielf meant ionization of sulfuric acid (and wrongly put it as triprotic acid anyway haha)

So yep, in the formation of sulfuric acid, the only reaction in equilibrium is:

[onlyfknhuman]

Burner -  one arrow
Converter - double arrow
Absorption Tower - one arrow
Diluter - one arrow

Im 100 percent this is the case, as the 1st 3rd and 4th reactions are almost complete reactions.

Sorry sorry I misinterpreted, I was thinking danielf meant ionization of sulfuric acid (and wrongly put it as triprotic acid anyway haha)

So yep, in the formation of sulfuric acid, the only reaction in equilibrium is:

haha dont need to be sorry

[j.el-halabi]

When the question says complete combustion, do we show a full arrow (rather than the reversible ones)? Also, are the last two sulfuric acid reactions reversible or do they go to completion? Insight says completion but my teacher says reversible???
And another question:
Insight 2008 M/C Q4:
Which of the following changes will always ensure an increase in the rate of a chemical reaction?
I: Adding a catalyst, II: IncreasingTemp, III:Increasing conc, IV: Increase surface area of reactant
My answer was (D): All four of them but the answer says it is only the first three then offers no decent explanation for my surface area wtfness. Plz help...

increasing the surface area of the reactant doesnt ALWAYS ensure an increase in the rate of a chemical reaction; this only occurs when you have 2 or more reactants and this is not always the case. You may in some cases have one reactant forming the product: EG, CO2(aq)---> CO2(g) Etc

[danielf]

thanks heaps everyone thats really helpful