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Chemistry: Post your doubts here!
Nothing much to it, really. The anode is made of impure copper, the cathode is made of pure copper. The electrolyte is aqueous copper sulfate. After some time the cathode gets bigger in size/heavier in mass because copper was deposited on the cathode. This reaction happens at the anode: Cu... -
AS Chemistry P2 Prep.
Question: When one encounters a problem where we have to draw the dot and cross structure for a compound with more than 2 atoms do we use a different symbol (beside a 'dot' and 'cross') to represent the electrons of the third atom? This is what I did in IGCSEs. But one of my teachers said that a... -
AS Chemistry P2 Prep.
BF3 has a trigonal planar shape. The bond angle in it is 120 degrees. It has three bond pairs and no lone pairs. This seems all but natural considering it's in the same group as aluminium and thus has 3 outer electrons which are used for bonding. 117 degrees (the shape and examples) is not... -
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AS Chemistry P2 Prep.
Not a good idea. Writing both implies you're confused which one. Write any one (preferably dehydration). -
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Chemistry: Post your doubts here!
lol chemistry :rolleyes: What's in red is supposed to be 2e(-). I've added what's in green. Honest mistakes I suppose. :p -
Chemistry: Post your doubts here!
We know Chlorine has two known isotopes Chlorine - 35 and Chlorine - 37. The peak at 35 is because of the (35)^Cl+ particle. The peak at 38 is because of the H(37)^Cl+ particle. (I know, neither the mark scheme nor the examiner's report mention that the particles are supposed to have a positive... -
Chemistry: Post your doubts here!
I think examiners will avoid putting such questions into the paper. Are you aware of any pastpaper question(s) that ask for the bond angle of H2S? -
Chemistry: Post your doubts here!
Well if you want to be scientifically correct, 104.5 is NOT the bond angle it is much lesser due to several factors (size of sulfur atom, electronegativity of sulfur, orbital hybridization). But we don't need to learn that for AS (at least I think we don't). -
Chemistry: Post your doubts here!
Sulfur is in Group VI. It is bonded to two hydrogens. This means Sulfur is left with 2 lone pairs. So the bond angle would be the same as that of water (104.5). -
Chemistry: Post your doubts here!
Because the oxidation of SO2 to SO3 requires a catalyst. -
Chemistry: Post your doubts here!
Oxygen? :eek: I don't think we're allowed to add oxygen. :S -
Agreed 100%. If not a regular check (in all honesty, it's pretty impractical to ask someone to...
Agreed 100%. If not a regular check (in all honesty, it's pretty impractical to ask someone to get themselves checked for cancer) we all at least need to know the early signs. (PS: Some cancers are infectious)- Jaf
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As much as cancer is hyped over in the West, there is very little concern over it comparatively...
As much as cancer is hyped over in the West, there is very little concern over it comparatively in the East. Support groups are non-existent, average public awareness is 0. 'This girl had cancer. She'll never get married or all her children will have cancer too' - is the type of sick mentality...- Jaf
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Chemistry: Post your doubts here!
I'm getting: PbO2 + 4H^(+) + SO4^(2-) + 2e- ------> PbSO4 + 2H2O This is a perfectly balanced half equation. But the problem with this equation is that it doesn't make sense. Sulfuric acid is a dibasic acid. This means one mole of H2SO4 will give 2 moles of H+ and one moles of sulfate ions... -
Urgently Everyone! We are dead! :(
^The majority of the UK gives Edexcel exams. Nonetheless, there's reason to believe that the article is meant for all UK examinations in general. -
How are you so sure CIE examiners will view your profile? :p
How are you so sure CIE examiners will view your profile? :p- Jaf
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Cheating in Alevels???
Exactly. It was probably a 'false' warning; kind of like what teachers do to students so that the students fear them (something like I'll ask so-and-so to reduce your marks but they don't do it actually). :p Ask your 'friend' ;) to chill.