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  1. Metanoia

    Chemistry: Post your doubts here!

    To add Br2 to an alkene, the two Br atoms must end up on carbons next to each other.
  2. Metanoia

    Chemistry: Post your doubts here!

    Q5. The molecule is not symmetrical, you have to view it in its 3D shape, it is tetrahedral. Q6. MgCl2 dissolves, SiCl4 hydrolyses. Q23. Each carbon has 4 single bonds, they are tetrahedral shape around each carbon. Q36. NH3 accepts a H+ to form NH4+, it is a proton acceptor (base) Q39...
  3. Metanoia

    Chemistry: Post your doubts here!

    Q10. Graphite is made up of sheets of hexagonal rings, the angle among the carbon atoms are 120 degrees. Q18. A. (Wrong) Br2 is non-polar molecule (ID-ID intermolecular attractions), should be soluble in non-polar solvents. B. (Correct) Br2 molecule mass is 80 x 2 = 160, which is heavier than...
  4. Metanoia

    Chemistry: Post your doubts here!

    Reactions require the CN- and I- nucleophiles to attack the (CH3CHCH3)+ carbocation. CN- is a stronger nucleophile and so attacks the carbocation at a faster rate.
  5. Metanoia

    Chemistry: Post your doubts here!

    Q1. CxHy + O2 --> CO2 + H2O from info, 10 cm3 of CxHy reacts with 50 cm3 of O2 to produce 30 cm3 of CO2 1CxHy + 5O2 --> 3CO2 + ?H2O Comparing both sides of equation, balancing carbon : x =3 balancing oxygen : 10 = 6 + ? , therefore ? = 4 1CxHy + 5O2 --> 3CO2 + 4H2O Finally, balancing H...
  6. Metanoia

    Chemistry: Post your doubts here!

    See if posts #9228 and #9239 on page 462 helps.
  7. Metanoia

    Chemistry: Post your doubts here!

    uote="FarahMJ, post: 816020, member: 43405"]Help with this please, ans is C [q
  8. Metanoia

    Chemistry: Post your doubts here!

    Maybe a final point... The reason why one would want to reflux alcohol with dichromate in the first place is that they wish to obtain acid instead of aldehyde. So whatever "yield of product" mentioned later, the product should be understood to be acid. Even if some aldehyde is indeed formed...
  9. Metanoia

    Chemistry: Post your doubts here!

    The interpretation is at the end of the reflux procedure, only acid is left. It could just be as likely that no alcohol is left in the mixture. Only excess dichromate, water and carboxyllic acid.
  10. Metanoia

    Chemistry: Post your doubts here!

    Well, for MCQ, it doesn't really matter. Like i said, its just for discussion purpose, maybe will make a difference if its a theory paper where we need to design experiment procedure.
  11. Metanoia

    Chemistry: Post your doubts here!

    Which is my point of concern. Cause the acid should the higher point compared to alcohol. The only sense i can make it it is they collect the alcohol distillate first, then collect the acid.
  12. Metanoia

    Chemistry: Post your doubts here!

    For discussion's sake, when the question says the product is collected by distillation. What do you think the distillate is?
  13. Metanoia

    Chemistry: Post your doubts here!

    Honestly, I do see some flaws in the question set. I believe they intend for students to interpret in this manner. 1st part of experiment: Reflux to oxidize alcohol to acid. 2nd part of experiment: Distillation to separate mixture of alcohol and acid.
  14. Metanoia

    Chemistry: Post your doubts here!

    s04qp1 Use the 4 options and trial and error. Before dehydration, the C=C bonds were actually CH-COH. Check which of the 4 could possibly give us a tertiary alcohol (resistant to oxidation) before dehydration. In this case, it was D.
  15. Metanoia

    Chemistry: Post your doubts here!

    Could I confirm the date of the chemistry paper?
  16. Metanoia

    Chemistry: Post your doubts here!

    Q4. The top number is mass number (proton + neutron), to find the protons, you need to refer to Periodic Table A. Bi : 83 protons, 126 neutrons B. Pb : 82 protons, 126 neutrons C. Po : 84 protons, 126 neutrons D. Tl : 81 protons, 127 neutrons So Tl is "unstable" as it does not contain 126...
  17. Metanoia

    Chemistry: Post your doubts here!

    w08qp1 s13qp13 Two possible radicals could be created from propane. Radical A reacting with radical B produces structure 1 Radical B reacting with another radical B produces structure 2
  18. Metanoia

    Chemistry: Post your doubts here!

    Q9. HCl is a strong acid, so 1M of HCl is expected to produce 1 M of H+ ions A. CH3COOH is a weak acid, so 1 M of CH3COOH produces less than 1 M of H+ ions B. HNO3 is a strong acid, so produces 1 M of H+ ions C. NaOH is a strong base, so produces 1 M of OH- ions D. H2SO4 is dibasic, 1M of H2SO4...
  19. Metanoia

    Chemistry: Post your doubts here!

    Q15. This is a similar to question Q14 of 2006. Group II nitrates decompose based on the equation below: 2 X(NO3)2 (s) --> 2 XO (s) + 4 NO2 (g) +O2(g) 1.32 g is mass of NO2 and O2 gas, the left over mass 0.68 g is XO. Mass of XO = 0.68g Moles of XO = 0.68/ (Mr of X + 16) Mass of X(NO3)2 = 2...
  20. Metanoia

    Chemistry: Post your doubts here!

    Using a cycle, it can look like this.
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