Suggested Answers - Illuminati

[WhoTookMyUsername]

Time it takes for it to dissolve is more of an average rate though. You cant interval the time it takes something to dissolve every 10 seconds or so whereas you can measure the volume of CO2 every seconds to find some indication of rate.

But for the purposes of the question it was simply related rates, (relative to other) so surely they wouldn't be that tight D:?
Also didn't say instantaneous RoR

[oneoneoneone]

Time it takes for it to dissolve is more of an average rate though. You cant interval the time it takes something to dissolve every 10 seconds or so whereas you can measure the volume of CO2 every seconds to find some indication of rate.

But for the purposes of the question it was simply related rates, (relative to other) so surely they wouldn't be that tight D:?
Also didn't say instantaneous RoR

Thats true. I hope they accept your answer then

[kmp34]

Time it takes for it to dissolve is more of an average rate though. You cant interval the time it takes something to dissolve every 10 seconds or so whereas you can measure the volume of CO2 every seconds to find some indication of rate.

But for the purposes of the question it was simply related rates, (relative to other) so surely they wouldn't be that tight D:?
Also didn't say instantaneous RoR

Thats true. I hope they accept your answer then

How does this relate to Ka?
and the 2 in front of the H3O+ because 2 protons are donate; suppose there should have been 2 H2O's as well though right?

[WhoTookMyUsername]

lol i actually got the dissociation question wrong. Not that i can even see what i did wrong...
maybe it wasn't as easy as i thought xD

[baddin]

Also q4. bi) and bii) don't they round up to 8.4*10^-4 M

[sh00my]

Another way in minimising the production of acid rain is by recyling the expelled so2 gas. This is both cost effective and environmentally friendly.

For anyone who's interested

[Suvyran]

If I lost 4 marks in the mid-year and 3-4 in today's paper and did well in my SACs what study score can I expect (I know it depends but I just want a rough estimate)? Thanks.

[thetimeis]

MC Question 14? Isnt energy absorbed by calorimeter the total heat of reaction, i.e, the sum of the energy changes? Happy for an explanation.

[baddin]

If I lost 4 marks in the mid-year and 3-4 in today's paper and did well in my SACs what study score can I expect (I know it depends but I just want a rough estimate)? Thanks.

Maybe 41-43

[Tonychet2]

for the first question would i get mark if:

i wrote collect the amounts of caco3 from the two experiments after a certain amount of time and the one that weighs less had a faster rate of reaction?

also for sulfuric acid (probably lost 2 marks here)

i wrote mining of sulfide ores is unsustainable and processing of sulfuric acid creates greenhouses gases? part b

part c i wrote : some bs about government implementing carbon tax to reduce the amount of sulfuric acid created therefore less greenhouses gases are produced from processing? (lol)

[sh00my]

If I lost 4 marks in the mid-year and 3-4 in today's paper and did well in my SACs what study score can I expect (I know it depends but I just want a rough estimate)? Thanks.

Good efforts, I would think that would get you anywhere from 44 and above.

[Tonychet2]

If I lost 4 marks in the mid-year and 3-4 in today's paper and did well in my SACs what study score can I expect (I know it depends but I just want a rough estimate)? Thanks.

like 45-48 easy

[charmanderp]

Time it takes for it to dissolve is more of an average rate though. You cant interval the time it takes something to dissolve every 10 seconds or so whereas you can measure the volume of CO2 every seconds to find some indication of rate.

But for the purposes of the question it was simply related rates, (relative to other) so surely they wouldn't be that tight D:?
Also didn't say instantaneous RoR

Thats true. I hope they accept your answer then

How does this relate to Ka?
and the 2 in front of the H3O+ because 2 protons are donate; suppose there should have been 2 H2O's as well though right?

There wasn't meant to be a two in front of the H3O+ in the equation that you wrote down.

[charmanderp]

delta H = -2E/n = 1.41 x 10^3 kJ/mol

Value for delta H needs to be negative.

[charmanderp]

Also q4. bi) and bii) don't they round up to 8.4*10^-4 M

I got 8.4 too, but wasn't it to the power of -5? My memory fails me.

Also, what would 7 dropped on the midyear and 1 dropped today get me, with 100% SACs?