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  1. Metanoia

    Chemistry: Post your doubts here!

    I'm referring to the reply by The Sarcastic Retard. For your queries, you can click on the link on my signature "YouTube Videos for solutions to 9701 MCQ"
  2. Metanoia

    Chemistry: Post your doubts here!

    Perhaps you can explain why you think the equilibrium on the left cell would change if sulfates was added, using any equilibrium equations you think is relevant.
  3. Metanoia

    Chemistry: Post your doubts here!

    Rather than view it in terms of "electron pairs", it is more correct to view it as "electron groups", so there are two electron groups around the carbon atom in CO2. I did a few videos on molecular shapes, hope they might be useful to clear things up for you.
  4. Metanoia

    Chemistry: Post your doubts here!

    order with respect to [CH3CHO] is 1 order with respect to [CH3OH] is 1 You would need answers to part a and b to find order with respect with H+, compare any two experiments and also sub in orders with respect to [CH3CHO] and [CH3OH]. e.g Experiment 1 and 4
  5. Metanoia

    Chemistry: Post your doubts here!

    hmm..this question was addressed here. https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-733#post-942233
  6. Metanoia

    Chemistry: Post your doubts here!

    the H+ is for purpose of balancing the equation MnO4- + 4H+ + 3e ---> MnO2 + 2H2O If you really want reflect that it is non-acidic, you can manipulate the equation as follows. MnO4- + 4H+ +4OH- + 3e ---> MnO2 + 2H2O + 4OH- MnO4- + 4H2O + 3e ---> MnO2 + 2H2O + 4OH- MnO4- + 2H2O + 3e --->...
  7. Metanoia

    Chemistry: Post your doubts here!

    That would be used in alkaline conditions.
  8. Metanoia

    Chemistry: Post your doubts here!

    If you are referring to part a), unfortunately, there isn't any (straightforward) rule to determine if the carbon atoms are co-planar or not. It ultimately depends on if you able to visualize the shape in 3D format and picture the rotation of the single bonds to force the carbon atoms to line...
  9. Metanoia

    Chemistry: Post your doubts here!

    If its zero order, double the concentration will not affect the gradient , the graphs will overlap and be identical. If its second order, doubling the concentration will have 4 times the gradient.
  10. Metanoia

    Chemistry: Post your doubts here!

    You will need both graphs for this. Draw the tangents to both graphs at time = 0 For example.. If the gradient of tangent at double the concentration is TWICE the gradient of the other tangent; then its first order wrt to HCl.
  11. Metanoia

    Chemistry: Post your doubts here!

    CaMg(CO3)2 (s) --> CaO (s) + MgO (s) + 2CO2 (g) Original Mr of CaMg(CO3)2 = 184 Mr "lost" = 2 x Mr of CO2 = 88 % lost in mass = (88/184) x 100%
  12. Metanoia

    Chemistry: Post your doubts here!

    Look for the Bond energy data in the data booklet Cl2 (g) --> 2Cl (g) Divide that value by 2 to get the atomization of chlorine 1/2Cl(g) --> Cl (g)
  13. Metanoia

    Chemistry: Post your doubts here!

    To show that the reaction is first order with respect to the reactant in the y-axis. Draw lines to figure out the half-lives (duration for a concentration to drop to half its value). The convenient ones I've chosen for this question is the time taken to drop from 0.2 M to o.1M, and time taken...
  14. Metanoia

    Chemistry: Post your doubts here!

    Eqn 1 is reduction. Eqn 2 is oxidation. You need to make sure the number of electrons are the same before combining or comparing. Therefore you need to multiply eqn 2 throughout by 2.
  15. Metanoia

    Chemistry: Post your doubts here!

    Yes. That is correct. You can also use O level chemistry to check your answer- in decreasing reactivity of metals, Chromium, Iron and Silver. So the most stable ion is Cr2+ and the most stable metal is Ag. They will require the strongest reducing agent and oxidizing agent respectively to under...
  16. Metanoia

    IGCSE vs GCE O levels

    Some countries do tailor their own O level papers to make them slightly more difficult than other countries.
  17. Metanoia

    Biology; Chemistry; Physics: Post your doubts here!

    In simplest terms, Density : amount of mass per volume e.g. g/cm^3 melting point: temperature at which a substance changes from solid to liquid state boiling point: temperature at which a substance changes from liquid to gaseous state Density and melting points/boiling points do not have...
  18. Metanoia

    Biology; Chemistry; Physics: Post your doubts here!

    Its is not the volume ratio that is 2:1, it is the mole ratio that is 2:1. moles of H2SO4 = 0.0219 x 0.11 = 0.002409 mol moles of NH3 = 0.002409 x 2 = 0.004818 mol mass of NH3 = 0.004818 x 17 = 0.0081906 g conc of NH3 = 0.0081906/0.025 = 3.27624 g/dm^3
  19. Metanoia

    Chemistry: Post your doubts here!

    Part v) answer is 1,5*10-4? I've recalculated and got 4.39 x 10^-5. I'll check later to see if I can spot what went wrong.
  20. Metanoia

    Chemistry: Post your doubts here!

    Oh, I spotted my mistake, I used [OH-] from M(OH3) only instead of the total [OH-], a quick calculation still doesn't get me 1,5*10-4 mol4dm-12. Will relook at it again. Were the other parts correct?
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