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The numbers in the table are the reduction potentials. The more positive means it is more likely to be reduced. If you flip the reduction potentials around you get the oxidation potentials. Again the more positive, the more likely it is to be oxidised. On a reduction potential chart, The more...

thank you. i don't have the solution but i did the same thing so i guess it would be right.

When excess barium chloride solution was added to a solution by dissolving 2.51g of commercial lawn food in 250ml water, 1.03g barium sulfate was formed. The percentage sulfur in the lawn food is?

thanks..i'm such an idiot i was calculating con of chloride

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2012exams/pdf_doc/2012-hsc-exam-chemistry.pdf how do you do the last multiple choice question. I approached it in two methods, and got it right on one account (by selecting the nearest answer) and wrong on another account. What is the...

The way you write it should correspond to what is happening It should be written as Fe3+, Fe2+ if iron is going to be reduced.

Is this even possible? Both species are being oxidised?

re: HSC Chemistry Marathon Archive A few drops of methyl orange indicator were added to 10ml of water in a beaker. The mixture appeared yellow. Drops of dilute acetic acid were then added until the mixture just turned red. Identify the change that can be made to turn the indicator colour back...

you lost me here. AAS of oxides? not sure if that is even possible. is it?

the only reason i got this question correct is that i did a past paper question the morning of the exam which was based on this principle.

Re: HSC 2013 2U Marathon thanks

Re: HSC 2013 2U Marathon is it in the 10th hour? i'm so bad at visualising. Can someone help me with this question: Find the exact area enclosed by the curve y=sinx and the line y=1/2 for 0 < x < 2pi

Re: HSC 2013 2U Marathon how did you get the perpendicular height for the cone? dw i got it.

Re: HSC 2013 2U Marathon The answer is 125 root(35) pi / 648 cm^3

Re: HSC 2013 2U Marathon A sector of a circle with radius 5cm and an angle of pi/3 subtended at the centre is cut out of cardboard. It is then curved around to form a cone. Find its exact volume.

Re: HSC 2013 2U Marathon Differentiate: x Times (49-x^2)^1/2

Re: HSC 2013 2U Marathon yes it's 16. but i'm getting frustrates cause i used substitution and then subbed 0.45 (b) into two different equations to get a, and got 2 different values. So if anyone did it the long way i would appreciate if they could show me how they did it.

Re: HSC 2013 2U Marathon can someone pleaseeee show working for finding a with substitution as well as 50th term.

Re: HSC 2013 2U Marathon 3, it's from an independent paper which ripped it off maths in focus.

Re: HSC 2013 2U Marathon can someone explain how you got a and 50th term, i solved the two Sn questions simultanously, and got 0.45 but when i sub into the two different equations i end up with 2 diffrent values for a which is wrong.