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Do you guys reckon it was OK to put CFC's such as CF3Cl for pollutants in the stratosphere? Eg using Cl* free radicals etc.

yep I got similar.

I believe 12 D is correct yes

Destroyed it (hopefully) got everything except for the pH question because I confused myself (should get 1/3 for it) raw ~92+

Fuck yes. Pretty sure I got 100% in multiple choice (went over w/ teacher after exam) Here are answers I got in order. B D A C B C C D B B B D D A C A C C A A Can we get a consensus on what was the correct 100% answers? Fairly sure the above is right.

not all nighter, but stupid memorising water purification CRAP! eh.

10%+

The idea of geostationary orbit is that at that distance the period will be 24 hours. The Tower B is in geostationary orbit. Thus its period at the top is 24 hours Thus if the tower disappeared and the ball remained (in other terms 'dropping' the ball), the ball will still have a period of 24...

Yea, so mass decreases slightly when it is pulled off, then goes back to normal/previous as the solenoid "goes away" as there is no more influence. Its just attraction and then the absence of the solenoid.

That's a good point, the question isn't very specific on what it means "best". however, for a one mark question, that extra analysis etc shouldn't really be valid, further making me think it was B just because you 1) chose and approx wavelength. 2) use the equations to sub it in. it got you...

~85+ felt pretty good except fucked a few questions.

Here are what I believe to be the correct answers (after consulting w/ teacher and fellow classmates) 1. D 2. A 3. C 4. B 5. C 6. C 7. B 8. A 9. B 10. D 11. C (I got D but it is C eh) 12. A 13. B 14. D 15. D (though in truth no statement is really correct) 16. C 17. B 18. C...

The post above has been falsehood and fiction. Can we get back on topic?

Yes, the absolute and apparent magnitude is necessary for calculating distances via the modulus equation.

Thats what I did, and then talked about formation of elements in outer layers of supernova (higher mass than Fe) I really hope I mentioned that it was an eclipsing binary system :|

What did you guys think of the Astrophysics section? Hard easy etc? The life sequence of the star (flow diagram) was pretty easy. In the last question (binary system) I got: Star B was white dwarf Star A was main sequence Also determined brightness ratio Also determined distance (using...

It is B.

Yes and No. When describing lives of stars, you need to determine the SM differences between white dwarfs, neutron stars and black holes, but don't need to name the limit. More so for useful information! (Now you know WHY the limits are what they are!)

see my worked solution in my above posted (the edit)

Is the answer A? Just working it out then and I got A. (simple maths calculations) EDIT: I forgot to molecular weight of Copper Carbonate. The correct answer should be B. Calculations: 10ppm for 0.400 absorbance ?ppm for 0.500 absorbance Therefore 10/0.4 = 25 25*0.5 = 12.5 As it is...