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Recent content by meoooow

  1. M

    Physics MCQs thread.

    its C!
  2. M

    Physics MCQs thread.

    can someone please explain how to do this?
  3. M

    Chemistry MCQ thread...

    ohh, okay i get it! thanks :D
  4. M

    Chemistry MCQ thread...

    24 Tartaric acid is present in some wines. It may be synthesised in the laboratory in two steps. OHCCHO intermediate HO2CCH(OH)CH(OH)CO2H step 1 step 2 tartaric acid Which reagents could be used for this synthesis? step 1 step 2 A HCl (aq) HCN(g) B HCN, NaCN(aq/alcoholic) H2SO4(aq) C...
  5. M

    Chemistry MCQ thread...

    nope, its D :(
  6. M

    Chemistry MCQ thread...

    39 Textiles for use in aircraft are treated with a finish containing a halogenoalkane. What is the reason for this? 1 The textile burns less easily, improving safety. 2 The fabric forms hydrogen bonds to water more readily, making the fabric easier to wash. 3 The halogenoalkane undergoes...
  7. M

    Chemistry MCQ thread...

    Yes, it is! how did you do it?
  8. M

    Chemistry MCQ thread...

    4 Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction...
  9. M

    Chemistry MCQ thread...

    13 In aqueous solution, the acid HIO disproportionates according to the following equation where m, n, p and q are simple whole numbers in their lowest ratios. mHIO → nI2 + pHIO3 + qH2O This equation can be balanced using oxidation numbers. What are the values for n and p? n p A 1...
  10. M

    Chemistry MCQ thread...

    7 Flask X contains 5 dm3 of helium at 12 kPa pressure and flask Y contains 10 dm3 of neon at 6 kPa pressure. If the flasks are connected at constant temperature, what is the final pressure? A 8 kPa B 9 kPa C 10 kPa D 11 kPa hey can someone please help me with this?
  11. M

    Chemistry MCQ thread...

    12 Camphor is a white solid which was used to make the early plastic celluloid. Camphor contains the same percentage by mass of hydrogen and oxygen. What is the molecular formula of camphor? A C10H6O6 B C10H8O C C10H16O D C10H10O2 can someone show me how to do this?
  12. M

    Chemistry MCQ thread...

    can you explain? isnt it supposed to be just W? (obv, since there is no option :P) but i wana know how it's B.
  13. M

    Chemistry MCQ thread...

    3 Equations involving four enthalpy changes are shown. Na(g) → Na+(g) + e– ΔH = W Na(g) → Na2+(g) + 2e– ΔH = X Na(s) → Na(g) ΔH = Y Na(s) → Na2+(g) + 2e– ΔH = Z What is the second ionisation energy of sodium? A 2W B X – W C Y – W D Z – Y
  14. M

    Chemistry MCQ thread...

    :D Thankyou!
  15. M

    Chemistry MCQ thread...

    38 Which structural formulae represent 2,2-dimethylpentane? 1 (CH3)2CHCH2CH(CH3)2 2 (CH3)3CCH2CH2CH3 3 CH3CH2CH2C(CH3)3
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