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You do not need to know about the calculations used to justify the ultraviolet catastrophe but you can mention it as the reason why classical physics was inadequate in explaining blackbody radiation. E=hf is a simplified version of what Planck derived. But the key to E=hf is firstly the...

This is probably a late reply, but i guess its good for revision I dont get the first one, where is light bulb, before or after the transformer cos if n increases, doesnt I decrease? For 2) P=VI but V=RI there fore P=I2R Therefore assuming power is conserved with an efficient transformer I2R =...

The syllabus asks that you be able to No, technically you dont even have to know about rockets if you pick Esnault Pelterie he experimented with liquid fuels, built the first all metal-monoplane, designed the first joystick and invented the aileron. But i would suggest you pick someone more...

F= (Gm1m2)/R I agree with what helper said, a good theory must be able to do two things i) Be proven experimentally ii) Make accurate predictions about phenomena 3 marks? 1- identify an experiment which validates this claim (i dont know of any... i think cavendish would be hard to come by esp...

Im given year 11 mathematics im sure you would've done work on parabolas? 1st tip to note when you do projectile motion questions (as in 3U hsc maths and 4U) is graphing or sketching is always helpful. 2nd that formula as u might notice is a parabola in it self "s" is the y intercept, "t" is the...

^^^ Haha WTF hygroscopic... sounds... scary. lol I'm not so sure about the explanation, i think it intended it to be open ended like thats why they increase is 0.1 pH is fairly small. I really liked Trebla's solution, creative haha i think they would've marked that correctly. But i think i...

Firstly, props to insane-username that was the most f*cking cool proof ive ever seen in chemistry rofl, as if you the quadratic formula to find concentration haha. umm I guess its easier to explain amphiprotic first Amphiprotic substances (NaHCO3) which act as either a proton donator (acid) or...

Hey Maddy, as the others have mentioned it does not affect amount of moles, but the concentration. The burette and pipette must be rinsed with a portion of the solution because they are measuring quantities of the solution. A film of water remaining on the inside surface would effectively lower...

Yeh its clear that the answers are wrong. -log[0.02] = 1.69 (i.e. 1.7) they've mistyped it for sure And its a bad question from the start because as marty said its diprotic meaning there are two equations for the ionisation of H2SO4 i) H2SO4 + H2O --> H3O(+) + HSO4(-) ii) HSO4- + H2O <-->...

Brenton said it all, don't forget to specifically mention that they cannot react with the electrolyte solutions because it disrupts the galvanic cell's processes.

There is only one polystyrene. But commercially there are two predominating types. i) Polystyrene used in tool handles or car batter cases. Properties:- Hardest (out of PVC, LDPE and HDPE) due to large stiffening side group (phenyl side group) - Does not have C-Cl bonds so it is not vulnerable...

Well based on the fact that this is "Production of Materials" I would assume your talking about the Porous barrier in galvanic cells. Basically in galvanic cells redox occur (i.e. transfer of electrons) As electrons transfer to the cathode side two things happen: i) The cathode solution has its...

Hey, fortunately, i came across a similar question in a catholic trials question so heres my 2 cents. Apart from looking at chemical properties O3 has a greater boiling/melting point than O2 This can be explained in that O3 has a coordinate covalent bond. Moreover this ozone is in resonance...

Hey um, theres another thread for this same question, but heres how i depic the marking criteria Describe- identify characteristics and features? soo... 1 mark- describing methods (technologies) used to obtain the data these included (at the time 1970s) ground based UV spectrometers as well as...

Hey i agree wrxsti but i think it is wise that you do know examples but not "needed". When markers examine 6-8 marks questions, often they will mark not only on the criteria but the clarity or what you depict as your depth of understanding, examples will add to this apparent "depth of...

chemistry of art=quanta to quarks

if youre worried about specifics, just know that usually if they do do a specific itll be either australian, or one which has easy to remember quotes, or obvious ones, like they did abraham lincoln, "government by the people or i duno whatever" thats already a couple techniques u could pull of...

WTF IN THE WILD WAS THE ONLY THING WORTH LEARNING IN ENGLISH 2u! no way.... idiots... why not rid us of imaginary journeys... its ridiculous

thanks c.star and rofl to my pst reply to a student of 2005 (as some of my friends pointed out)

THANK YOU DAMNATION IF YOUR STILLN READING HERE... omg yes! lol