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ive got its an electrochemical cell (galvanic) with pT and Ag eletrodes in KCl; all in a porous plastic membrane filter. Oxygen diffuses through the pores into the KCl and electrolysis takes place and amount(electrolysis) is directly proportional to concentration oxygen. Is the electrolysis the...

Sketch y=2sinx for -pi<=x<=pi without integrating, evaluate the area bounded by the curve y=2sinx for -pi<=x<=pi and the x axis so the answers did from 0 to pi/2 and multiplied by 4. how come we dont do the 2xintegral(0-pi)? because i dont understand why we can do this without an integral if we...

when given a diagram to recommend the transmission mediums. Just say its like for a farm. The answers to a question had fire optics because of the 2km distance and interference etc. But a farm wouldnt be able to afford these as its like 30,000 a kilometer or something. Would you use common sense...

experiment: place a raw chicken bone in a sample of each of acid, water, fire; to remove calcium to test the flexibility of bones after these conditions have taken affect on the raw bones. Accuracy: as it is not quantitative is there no accuracy to this? or would it be measuring the exact volume...

in fuel cells the incoming stream of O2 is split into 2O<-- free radicals what are the valency's of these? is it 2- for each so 2O2-?

"GasChromotography is used to separate complex mixtures of different molecules based on their physical properties, such as polarity and boiling point." i think im confused as to what is a physical and chemical property? is chemical only for how they react and physical is other stuff? could...

Show that the sum of the following series: root12 + root6 + root3.... is 2root6(root2 + 1) how do we do this without knowing how many terms there are? does it have something to do with the fact its getting smaller? and graphing y= 1/(x-3) how do we go about doing this?

when do you know when to split up an integral under a curver and then find the volumes of these two integrals and add them, rather than just taking the whole integral? and those exact ratio's. are they in radians or degrees lol maths is hard

So a sequential file uses delimiters and a sentinel value to show when its the eof. a question from 2006 trial 2006. We are reading a sequential file which has an array of records on it. Records in the array are sorted on surname of students. Now, i was under the impression that a sequential...

what are the steps to solving a ppm question. do we just get everything in mg/l? did any one's teachers teach them any hints????? tips that studfff

how many ppm can it test i know it does the .001 of some and does it test SO42- because i think i wrote down for acidic environment evidence of oxides of S and N are in small amounts 0.001ppm and aas can be used to detect them is this an expection to the "Cations only" rule? and to clarify...

is it just a device which is like a portable aas?

when we are asked to multiply 2 2's compliment numbers do we just do its outright because a number expresed in 2's compliment is equal it what it is not in 2's comp so say we had to multiply the 4-bit number of -5 decimal with -2 decimal 5(dec) = 0101(base 2) = 1011(2's comp) so this...

so as the exponent could be neg or pos i.e. (-1 for 1x10^-1 i.e. 0.1) or (1 for 1x10^1 i.e. 10) there has to be away to when way to move the decimal point along the real number (i.e. if it is a large number or a small number) I get this is because we represent numbers in scientific notation and...

2003 trial exam 22 d a number of staff are experiencing poor performance when using a LAN with 50 connected PC's. Jack (net admin) discovers that all these users are directly connected to a single hub and on this hub the data collision light is virtuall always on Identify network topology used...

10 of us are going up from 6-12th will any1 else be there lol

2007 22a the sulphur content in diesel fuel. i cant understand the answers i can see ppm for that year is 50ppm i dont understand why they do: "sulphur content in tank fuel = 50/1,000,000 x 60 = 3.0g" and with this part what equation are they using to do this i.e. how do they know the molar...

when doing calculations what decimal place? i read in the answers you should do your calculations to the same number of decimal points as the question has given. They do this, but they seem to round off/keep the moles as an entirety? what are your views????????

what are they thanks heaps maybe also give an example for one in Hamlet and Ros so i understand thanks

in galvanic cell's. (ill use question 5 HSC 2005 as my example) so the Al oxidises: 2Al-->2Al3+ + 6e- then the copper reduces 3Cu2+ + 6e- --> 3Cu my problem: so when this al oxidises, the al3+ ions will move through the salt bridge towards the beaker containing the cu (i.e. the cathode) to...