Search results

  1. K

    Is this the same organic side chain?

    Ah! Okay, But I'm just an international baccalaureate student if you know what that is, would they expect so much?!
  2. K

    Is this the same organic side chain?

    Attached is the image of the desired structure, my question is based on what is pictured as (CH3)2HC- I represented this group as C3H7 which does seem like the logical equivalent, but just being safe here. Am I right? Thank you!
  3. K

    Acids and Bases calculation problems

    Aah Borek! My old friend! ;) Well I know the logic doesn't apply because the answer book says it doesn't but the first para answered by question. However this is so silly because I cannot tell with any certainty which rule I should follow when!?
  4. K

    Acids and Bases calculation problems

    Homework Statement Data for Question B: (initial)[CH3COOH] = 0.500 mol dm–3 and) eqm [CH3COOH] = 0.200 mol dm–3; (initial)[CH3COO–] = 0.300 mol dm–3 and) eqm [CH3COO–] = 0.300 mol dm–3; The Attempt at a Solution Question A) " FInd the pH of a mixture of 50.0 cm3 of 0.100 mol...
  5. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    I appreciate that!, But unfortunately i'm just a 12th grader and I don't have that kind of stuff.
  6. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Oh god, alas, another experiment down the drain.. Thank you!
  7. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Sorry, before I go ahead, Is the reaction reversible? I seem to have made a stupid assumption that I can talk about the equilibrium shifting to remove excess reactants when it mayn't be a reversible reaction. How do I know if it is one? THanks Borek
  8. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Hi So the reaction is below: Sodium thiosulfate + HCl = Sulfur + NaCl+ Water+ SO2 So if I wanted to say 'Increasing the conc. of Sodium thiosulfate has shifted the equilibrium to the left (reactants) and thus the system works to break down excess reactants and create more product by...
  9. K

    How to determine zinc in a plant.

    Talk about luck haha! My mum's been teaching german for 15 years, however, A complexing agent I did come across was zincon, which was holy costly!! Yes, so sorry for the late up date. But I'm going with AAS since I can't find a complexing agent other than zincon for zinc.
  10. K

    How to determine zinc in a plant.

    Sorry, that's beyond me! :O I'm just a 17 year old guy! Please sympathize with me, this is tough enough with so much chemistry that's waay about my level!
  11. K

    How to determine zinc in a plant.

    Urgent: Some complexing agents for zinc. Hi, I am to extract Zinc from plant tissue, with 0.1N HCl. But since its colorless I cannot determine the concentration(using the colorimeter) of zinc without adding a chemical that forms a complex with zinc and has a color.
  12. K

    How to determine zinc in a plant.

    How would you extract zinc from a plant? Hi! So I basically need to find out how I'm supposed to extract zinc from a plant and its methodology and chemicals required. How do I do this? I found one article that is rather incomplete, it just says zinc was extracted using 0.1N HCl and not...
  13. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Well, turns out I won't need to flip the sign. However I have hardly varied my independant variable hence I must perform the experiment with 0.025 M, 0.05M, 0.1M, 0.2M, 0.4M masses of the chemicals. That will indicate efficiency in a better manner, you know may be I could calculate the average...
  14. K

    How to determine zinc in a plant.

    Woops! ignore my ignorance, I was just told that, well doesn't the AAS give you the concentration directly? Gosh, just pointless maches *argh* CHANGE: AAS or COLORIMETER
  15. K

    How to determine zinc in a plant.

    Which would you prefer? I'm calculating the amount of zinc absorbed by a particular plant (yes, in theory it does accumulate zinc- B.Juncea).
  16. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    I hope I can drop the formality. But Dude! measuring the initial temperature would mean measuring the temperature of water at room temperature? Oh and I was told I had the wrong answer because 0.025 mols does NOT represent 1 mol obviously and so my units in actuality weren't kJ/mol but...
  17. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Hmm, I think I went wrong when I was told to take 0.025 moles and 50 cm3 without any damn reason. Okay, I measured the temperatures only after I added water, that's the reason the values are negative. but in that case the enthalpy won't be negative when it IS an exothermic reaction.
  18. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Okay my bad, first off can you suggest how you would carry out this experiment? Here are the reactions for the hydration of CuSO4: 1)CuSO4(s) + Aq -----> CuSO4(aq) ∆H reaction What I got for ∆H reaction= -2kJ/mol Theoretical: -66.5 kJ/mol 2)CuSO4(s) -----> CuSO4.5H20(s) ∆H reaction...
  19. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Hi! Thanks for your interest in this this post :D! So two reactions I performed were: A) Adding 50 cm3 water to 0.025 moles CuS04 and measuring ΔT. B) Adding 50 cm3 water to 0.025 moles CuS04.5H2O and measuring ΔT. Well turns out the calculations were wrong, since I apparently didn't get...
  20. K

    Do Hess's Law equations have to be balanced

    1. Research Question: How effectively can experimental values estimate the heat of hydration of Copper (II) Sulfate as compared to theoretical values found using Hess’s law? 2. 3. In the image above I have ΔH20 and ΔHreaction(not labelled) and intend to experimentally find out ΔH...
  21. K

    Why does all the excess BE go to the radiated particle?

    I appreciate both the reply, but sadly I don't understand either, could you address the question directly without jumping into other complicated things! Thanks, I'm truly sorry for the inconvenience. :)
  22. K

    Why does all the excess BE go to the radiated particle?

    Did you type that out yourself? Cool, Thanks! I got most of it but the end was above me, and anyway its sufficient if you answer the doubt in words, since I'm not doing Physics in much detail.
  23. K

    Why does all the excess BE go to the radiated particle?

    Well all textbooks probably state something like this 'A Nucleus loses energy by radiation' I'm cool with that statement except the fact that all the excess BE or energy is lost only to the eg.alpha particle! and no mention of some being given to the new nucleus! Look at this for example: Mass...
  24. K

    Why does decay increase Binding energy ?

    Yeah I think I got it guys! sambristol's reply hold true for me, since I'm not studying too hi-fi physics, but it is right, right? "to go to a higher BE(binding energy) an atom has to lose enrgy'' now it makes sense since, as higher BE is actually more negative! :D PLEASE tell me if I'm right...
  25. K

    Why does decay increase Binding energy ?

    Can someone explain this excerpt from my textbook please? "IF nucleus A was made from its constituents (Binding energy) and it released 400MeV, but making nucleus B(product) releases 405MeV. Therefore if A changes to B, 5 MeV of energy must be released. This excess energy is given to the...
  26. K

    Nuclear Physics sum query

    (NOT HOMEWORK)Hey guys the question in the text book goes like this: Q) It is found that alpha particles with a KE of 7.7MeV bounce back off an aluminium target. If the charge of an aluminium nucleus is +2.1*10^-18C, calculate the velocity of the alpha particles(mass 6.7*10^-27kg)...
  27. K

    What is Q in kQq/r ?

    Thanks for the help, isn't this forum for everyone by the way? not just PhDs right?
  28. K

    What is Q in kQq/r ?

    What is Q in kQq/r ?? Hey guys the textbook says Q is (+Ze) and q is (+2e) the later is 2 times the positive equivalent of an electron's charge. Though the former I'm unable to make any sense of, what is Ze?? Thanks Cheers!!
Top