I can't remember if I arranged the paper in the correct order though...:p
Originally posted by Malachitear:Its really something like that? I did what nelexus did and just kinda left it cuz I couldnt figur it out. When you say its correct, is it something simple like the protonated alcohol was considered an intermediate and thus in the rate equation it is represented by H+ and HMF?
Originally posted by Lololgirl:I can't remember if I arranged the paper in the correct order though...:p
Many people stated that paper 3 was very easy and many of them got around 70+/80 (claimed by them). Is it true that we must get >70 marks for the whole of paper 3 to get an A? Thanks.
Originally posted by Lololgirl:Many people stated that paper 3 was very easy and many of them got around 70+/80 (claimed by them). Is it true that we must get >70 marks for the whole of paper 3 to get an A? Thanks.
Kk thanks for clarifying once again !
Hi! I have a question regarding the ideal gas question in paper 3.
Is the actual volume of the HCl gas supposed to be higher or lower than the predicted volume based on pV = nRT? Based on calculations, it seems that the actual volume is lower than the predicted volume. However, I had read that the volume of a real gas should be greater than an ideal gas at high pressures. Mind clarifying any misconceptions/errors I have made? Thanks in advance!
Originally posted by Weihaw08:Hi! I have a question regarding the ideal gas question in paper 3.
Is the actual volume of the HCl gas supposed to be higher or lower than the predicted volume based on pV = nRT? Based on calculations, it seems that the actual volume is lower than the predicted volume. However, I had read that the volume of a real gas should be greater than an ideal gas at high pressures. Mind clarifying any misconceptions/errors I have made? Thanks in advance!
no +- 1% between 75?xD
(If you disagree with any of the answers, post your reasons why.)
1. B
2. D (for hydrocarbons, if "p orbitals" refer strictly to unhybridized p orbitals only) or B (generally, and for hydrocarbons too if "p orbitals" includes hybridized orbitals)
3. C
4. C
5. B
6. D
7. B
8. C
9. A
10. B
11. D
12. C
13. D
14. B
15. D
16. D
17. A
18. C
19. B
20. A
21. B
22. D
23. B
24. A
25. D
26. D
27. D
28. C
29. B
30. A
31. D
32. A
33. C
34. A
35. B
36. A
37. C
38. C
39. A
40. B
.
Originally posted by DUbPie:.
.
shouldnt 33 be A since ideal gas particles has no mass and thus no volume?
Originally posted by Vitalitylx:shouldnt 33 be A since ideal gas particles has no mass and thus no volume?
.
Originally posted by DUbPie:thanks for the reply really appreciate it so is 37/40 a good score?
For Q2,
why can a sigma bond be formed by either an s or p orbital? does an sp3/ sp2 hybridised orbital also imply that theres a p orbital? because my nterpretation of this question is that p orbitals solely refers to unhybridised p orbitals?
Hi, thank you for the suggested answer,
May I know why is qn 1 b not c?
Qn 4, why cannot d? Metallic bonding depends on both delcalised electrons and charge.
39, if alkaline kmno4, wouldn't it not oxidise?
Originally posted by nelexus:For Q2,
why can a sigma bond be formed by either an s or p orbital? does an sp3/ sp2 hybridised orbital also imply that theres a p orbital? because my nterpretation of this question is that p orbitals solely refers to unhybridised p orbitals?
Originally posted by Lamejaneinschool:Hi, thank you for the suggested answer,
May I know why is qn 1 b not c?
Qn 4, why cannot d? Metallic bonding depends on both delcalised electrons and charge.
39, if alkaline kmno4, wouldn't it not oxidise?
Originally posted by UltimaOnline:
Indeed this is a tricky question, and many students struggled with this. Because in the H2 syllabus, every sigma bond is formed by the head-on or end-on overlap of either s orbitals or hybridized (sp, sp2, sp3) orbitals. But going beyond the H2 syllabus, sigma bonds can indeed be formed by the head-on or end-on overlap of p orbitals as well. Chemistry is chemistry (regardless of in or out of syllabus), so the correct answer to this question is still "sigma bonds can be formed by either s or p orbitals".
https://en.wikipedia.org/wiki/Sigma_bond
https://sites.google.com/site/ed350201003/Task
In this case the context is hydrocarbon..so im guess now the s orbital of hydrogen overlap with (unhybridised) p orbital of C to form a C-H bond?