• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. Metanoia

    Chemistry: Post your doubts here!

    Actually, since the limiting reactant here is zinc (solid), it so would be more correct to use "mass or moles" being the same between the two experiments rather than "concentration" The is no change in the 1) particle size of solid reactant (zinc) 2) concentration of the aqueous reactant...
  2. Metanoia

    Chemistry: Post your doubts here!

    Qn is asking for bond energy, not bond angle. I believe it should be C-Cl, but better check the data booklet to be sure.
  3. Metanoia

    Chemistry: Post your doubts here!

    Q3. I don't have the data booklet at hand now, but you can look it up and add the 1st and 2nd IE of Al. Then see which of the 4 options give then same total value as Al. Q10. D: Combustion of CH4 to CO2 and H2O is exothermic, so is the formation of N2 due to forming of triple bonds. Q29...
  4. Metanoia

    Chemistry: Post your doubts here!

    I'm new to this forum, suppose I want to attach a diagram to explain some of the questions, do I need to host the image elsewhere or can I upload directly from my hard drive?
  5. Metanoia

    Chemistry: Post your doubts here!

    In direction of oxidation, Primary alcohol functional group --> aldehyde function group --> acid functional group secondary alcohol functional group --> ketone functional group Q40. 1. (Correct) 1st compound aldehyde functional group is oxidised to 2nd compound acid group 2. (Correct) 2nd...
  6. Metanoia

    Chemistry: Post your doubts here!

    Q15. Check that the oxidation state of silver before and after the reaction is +1, it means that it is neither oxidized or reduced. This effectively eliminates options B, C and D. silver chloride is insoluble and the silver complex formed is soluble. Q9. less electropositve means less easily...
  7. Metanoia

    Chemistry: Post your doubts here!

    From a quick look , it seem that ans is B (1 and 2 is correct)? It might be faster if you can post the corresponding answers for your selected questions. For propane, two possible radicals can be formed. The unpaired electron could be on the 1st ( CH2CH2CH3) or 2nd carbon (CH3CHCH3) So we can...
  8. Metanoia

    Chemistry: Post your doubts here!

    A quick way to do this question is to express it as mass fraction of TiO2 and multiply by the mass of the ore. (Mr of TiO2/Mr of FeTiO3) x 19 tonnes
  9. Metanoia

    Chemistry: Post your doubts here!

    w07qp1 Q37 1. (Correct) CaO + ND4Cl --> CaCl2 + D2O + ND3 2. (Correct) CH3CN + NaOD + D2O --> CaCOONa + ND3 3. (wrong) NaOD + NDH3Cl --> NaCl + D2O + NH3 or NaCl + DHO + NDH2
  10. Metanoia

    Chemistry: Post your doubts here!

    Yes, that is a valid general guideline. Just be careful that in this question, C and D ( including A and B) are both primary. Though its a common mistake among students to view D as tertiary due to the skeletal structure used.
  11. Metanoia

    Chemistry: Post your doubts here!

    For elimination, the Cl is removed together with H from a "next door" carbon. Note that there are no H on the "next door" carbon for option D.
  12. Metanoia

    Chemistry: Post your doubts here!

    Yes, based on the half equation, your statement that 2 mol of SO3 2- loses 4 mol of e is true, just that it's not relevant to this particular question. If my previous presentation is not clear, I'll put the reasoning in step by step statement form. 0.025 mol of sulfite reacts with 0.05 mol...
  13. Metanoia

    Chemistry: Post your doubts here!

    Qn 9 : moles of SO3 2- : moles of electrons : moles of metal 0.0025 : : 0. 005 1 : : 2 1 : 2 : 2 2 mol of metal gained 2 mol of electrons 1...
  14. Metanoia

    Chemistry: Post your doubts here!

    You are right in that in is option D and not C, but the approach is a bit risky. Hmm...are you comparing the 2nd hump of option C vs the 2nd hump of option D? That would be a dangerous approach. At most we should be comparing the 1) 1st hump of option C vs 2nd hump of option C or 2) 1st...
  15. Metanoia

    Chemistry: Post your doubts here!

    Oh, thats right, i apologised. Option A is actually C-F bond broken. For option C, it is the C-Cl bond broken. So its is option C, but using the explanation I mentioned in post #9124
  16. Metanoia

    Chemistry: Post your doubts here!

    Oh, I'm surprised. What is the supplied answer?
  17. Metanoia

    Chemistry: Post your doubts here!

    I'm sorry, but the explanation is not correct. If we look carefully, the activation energy of the 1st step is more than the activation energy of the 2nd step for both options C and D. The correct approach is to realise there are two humps (2 step reaction), so either C or D. Then we need to...
  18. Metanoia

    Chemistry: Post your doubts here!

    Ans is A. Based on bond energy C-Cl would be broken. C-F and C-H bond would not be broken.
  19. Metanoia

    Mathematics: Post your doubts here!

    Procedure (explanation in brackets) 1. Weigh the mixture 2. Add excess sulfuric acid to the mixture (to dissolve the Copper (II) oxide) 3. Filter the mixture (separate solid carbon and copper solution) 4. Rinse the carbon residue with water and dry 5. Weigh the dry carbon 6. % mass of carbon =...
Top