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Although their equation is written wrong without the charges displayed, the formula Ag2S uses Ag+ so this is not the mistake

Ag2S (s) < -- > 2Ag+(aq) + S2-(aq) 8.0 x 10^-51 = [Ag+]^2 [S2-] 8.0 x 10^-51 = (2x)^2 (x) 8.0 x 10^-51 = 4x^3 x = 1.2599210498949 x 10^-17 This is the molar solubility of Ag2S. What you did next overcomplicates the subsequent working for the question. This number represents c(Ag2S) c(Ag2S)...

That's unfortunate to hear in terms of what happened in your school and it is unfair. In the end by the teachers doing that the overall band 6 success rate for the school in English will go down as people who got a good rank in the internals will underperform in the externals. Not sure if that...

Not really a comeback in terms of during the HSC year but something for future students currently in Year 11 having problems with English and being worried about it messing up their ATAR. During Year 7 to 10, I never got higher than a B in English at school because I didn't really understand...

The initial part of a uni degree that has the honours attached to it is the same as any other degree. The honours will be in the final year of the degree where you do a big project. The honours year yeah is basically like a full time job but the amount of days you will need to go in will vary...

There's no like formal introduction. You will have to just read the handbook for your degree very carefully, but if you have any questions you can usually contact some organisation inside the uni. Like at UNSW there is the Student Nucleus and each faculty has some kind of office that deals with...

Yeah I feel your future suffering being someone who lived in western sydney (castle hill area) and had to make the commute to UNSW around a similar time of 2 hours each way. It is very long I can't deny that and quite tiring and is the primary reason for my phd I've moved closer to the uni...

All you are required to do at uni is meet the requirements of the program. There is a recommended pathway but it's not the only way to go about doing it. One of my friends did a law / engineering double degree and he finished off all the engineering side of it earlier than the law part so it's...

I have just completed a math minor recently so haven't done all the maths subjects a person undertaking a major would go through but it varies a lot in terms of how interesting it is. But in general sense yes it's same where you understand the concept, practice it and then apply it to harder...

Just don't enrol in any science subjects for now and then make up your mind later. Changing the degree while at uni is not that difficult you just do it through the uni website by submitting some form and they assess/approve it It's not like school where you have to do everything in order. A...

In terms of the 95/100 result for 2 unit that is a fantastic result and shows you are good at maths and can probably pick up concepts well. However, you will need to for sure before you start the degree do the bridging course / learn the content yourself for the extension 1 maths. If you don't...

Pretty easy to be honest. I had a good memory so memorising the content was not too bad. I found there was an effort with making notes and learning the content the first time around but then after that I would just need to read the notes I made to recall the content as it's quite a straight...

No just enjoy the break. The only case I would say it's a good idea to prepare ahead is if you need to catch up on content in subjects you may not have undertaken. For example, to do MATH1131 you will need knowledge of the extension 1 maths content. In that scenario it would be important to do...

Most of your courses are good scaling. Doing like 1 or 2 moderate or lower scaling courses won't have that much on an impact. One thing you may be failing to understand is that although it may scale better attaining a certain mark in that subject will be more difficult than the lower scaling...

You're working is correct so far. The working in that answer is overcomplicating the question. What you have done is the more standard approach to doing it taught in hsc while the other one is for some reason trying to introduce ratios into the K expression which is not needed and a more...

The amount of H+ ions from the water and OH- ions is negligible. It would not really have an effect even if there was one. pH = 7 has a [H+] = 10^-7 mol/L and [OH-] = 10^-7 mol/L. Think about what that means for an acid concentration then if you had 0.1 mol/L acid solution it's going to barely...

I would look a bit more closely into that ANU thing about the 2nd year courses. You will still most likely have to do the first year courses because they are requirements of the degree / pre-requisites for the courses in Year 2 so although you might be familiar with the content generally...

Very few courses need an ATAR that is a 99. Choose the degree based on the field you are interested in. A lot of people get a higher ATAR than what they need for the course but it doesn't mean the ATAR will go to waste. You can still benefit from it by using those high marks to do tutoring...

The answer above by jimmy is correct but it's not a logical way to do the question. Use RICE tables. These are related to equilibrium equations you have already used in module 5/6 and so if you use that it's easy to set out the working logically and relate it to previous concepts you have...

ATAR is not too important. If you are tutoring maths and you got an 80 HSC mark in english, then there is no link between the two. In your advert when you write it there's no need to state every single mark you got for all subjects just list what is relevant to the subject you are trying to...