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Re: HSC Chemistry Marathon 2016 NEXT QUESTION: A student decided to set up a galvanic cell containing the Zn(s)|Zn2+(aq) redox couple to power his gaming device. Which other redox couple should be used so that the student's galvanic cell will have the largest possible voltage? In your...

Once you've written all of your points to back up your opinion. Simply write a judgement like for say "This statement is invalid". I don't think you have to explain why it's invalid since you have already written a lot of points on why it's invalid above. This is just an example

OK I GOT IT, thank you guys!

Re: HSC Chemistry Marathon 2016 NEXT QUESTION: A galvanic cell was set up as so: Cu(s)|CuSO4(aq)||AgNO3(aq)|Ag(s) (a) Explain the purpose of a salt bridge in this cell. (2) (b) Write down the net ionic equation of this cell and calculate the voltage it should produce. (2) (c) When this...

Re: HSC Chemistry Marathon 2016 I think you should talk more about how the whole processes absorbs and returns the same amount of CO2(g) in the atmosphere. Anyways, I'll just write what theyve here: Bioethanol is produced by the fermentation of plant glucose, initially formed from CO2(g) and...

3/4! Marking criteria says to don't forget to make a judgement of the statement at the end

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Re: HSC Chemistry Marathon 2016 Correct! 4/4 NEXT QUESTION: "The carbon dioxide released from combustion of bio-ethanol is balanced by carbon dioxide captured through photosynthesis. Therefore combustion of bio-ethanol does not increase the total amount of carbon dioxide in the atmosphere...

I still don't get how to do it ??/?

Re: HSC Chemistry Marathon 2016 Petroleum is a non-renewable fossil fuel, and supplies are being rapidly depleted due to heavy demands for petrochemicals for a variety of uses such as fuels, plastics, lubricants, solvents etc. The demand is increasing as world's populations increases...

Can anyone help me with this complex question please? The complex numbers z = x+iy and w=u+iv are such that w = z+2/z. (a) Express w in the form of u +iv (b) Hence, find and describe the locus of w if z moves along the unit circle. I did (a) already and is stuck on (b). Answer I got for...

I saw this question from Syd Grammar's old trial paper and thought was a great question: "The Earth exerts the exact same gravitational force on the Sun as the Sun does on the Earth due to Newtons 3rd Law". Assess the above statement (4 marks)

Re: HSC Chemistry Marathon 2016 Oh wow that's perfect!

If you like Maths, then I say stick with it and push yourself, aim high and then you won't have these worries about the future

New Question: Using the values given in the first question, determine the position of a geostationary orbit above Jupiter (perhaps a jovostationary orbit?) Rearranging Kepler's Third Law to find 'r' with values: T = 9 hours, 56 minutes = 35760 seconds M = 317.8 x 6.0 x 10^24 Therefore r =...

Re: HSC Chemistry Marathon 2016 Polyvinyl chloride is used in raincoats and shower curtains because PVC is water-resistant due to its structure containing many non-polar C-C & C-H bond. Its water-resistant nature combined with its rigid and toughness (as a result of chain stiffening) is used in...

V = 2.pi.r / T = (2.pi.x (69911 x 10^3)) / (35760 seconds) V = 12,283.6 m/s Centripetal acceleration = v^2 / r = (12,283.6)^2 / (69911 x 10^3) a = 2.15829 m/s^2 Gravitational acceleration = GM/r^2 = (6.67x10^-11 x 317.8 x 6.0 x 10^24) / (69911 x 10^3)^2 = 26.0219 m/s^2 Net acceleration due...

Mass is the absolute measurement of the amount of matter the object posses (scalar quantity). Whereas weight is the force acting on a mass in a gravitational field and is a vector quantity.