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  1. aalmuhannadi

    Hardest Chemistry MCQs ever.

    For q37, I think 3 is incorrect because, look at this this way if you just replace the D with H: NH4Cl + NaOH > H2O + NaCl + NH3, that would be the balanced equation. However, since you have NDH3Cl + NaOD, and you already know the molar rations are all 1 to 1 for everything, how can you get...
  2. aalmuhannadi

    Hardest Chemistry MCQs ever.

    Q9: from the question it says 50cm^3 of 0.1moldm^-3 of a metallic salt react exactly with 25cm^3 of 0.1moldm^-3 sodium sulfite The moles of each is therefore: n = cv = 0.05 * 0.1 = 0.005 mol of the salt and 0.025 * 0.1 = 0.0025 mol of sulfite ions, therefore from this we can now say that 1 mol...
  3. aalmuhannadi

    Edexcel January 2013 Question Papers (ALL GCE)

    Do you not have the Arabic jan 2013 paper unit 1?
  4. aalmuhannadi

    Texas Huge Explosions-What do you think ?

    "One man to five. A million men to one. And still they die. And still the war goes on" - James Fenton, I think some people only pay attention when it's a handful of people who are killed and ignore tragedies when people die by the masses: "The death of one man is tragic. The death of millions...
  5. aalmuhannadi

    Scratch that, Texas A&M all the way :P

    Scratch that, Texas A&M all the way :P
  6. aalmuhannadi

    Need help on AS chemistry (AQA)

    2. n = cv = (26.2/1000) * 0.1 = 0.0026 mol 3. From the equation, 2 mol HCl is required for each mol of sodium carbonate, therefore 0.0026 / 2 = 0.0013 mol of Na2CO3 is used. 4. c = n/v = 0.0013 / (25/1000) = 0.052 mol dm^-3
  7. aalmuhannadi

    The Scrambled Word. Can you ?

    Sometimes just don't forget orthodox riddles don't justify demeanor ;) aoeisdcf
  8. aalmuhannadi

    Math AS (M1)

    For vectors I think the main ones are s = vt r = r0 + vt And the normal equations, like F = ma and the kinematics equations just with vectors as the variables, am I right?
  9. aalmuhannadi

    AS Literature: poetry elimination?

    Hello all, I would just like to ask any AS language and literature students here: would it be possible to eliminate possible upcoming poems in the may 2013 exam based on previous poems' appearances? For example, I noticed that poetry from 'Songs of ourselves' have changed their selection...
  10. aalmuhannadi

    Does Anyone have all formulas for Mechanics (M1)-9709? (AS)

  11. aalmuhannadi

    Going to Pennstate inshallah!

    Going to Pennstate inshallah!
  12. aalmuhannadi

    Chemistry: Post your doubts here!

    A: Aluminium has metallic bonds and phosphorus has covalent bonds B: Chlroine has covalent bonds and argon has no bonding (or van der waals force if you want to consider that) C: Magnesium is metallic and silicon is covalent D: Sulfur and chlorine both have only covalent bonds So it's D
  13. aalmuhannadi

    Chemistry: Post your doubts here!

    0.144g of an aluminium compound X react with an excess of water, to produce a gas. This gas burns completely in O2 to form H2O and 72cm^3 of CO2 only. The volume of CO2 was measured at room temperature and pressure, what could be the formula of X? A: Al2C3 B: Al3C4 C: Al4C3 D: Al5C3 My teacher...
  14. aalmuhannadi

    Chemistry MCQ thread...

    A question regarding the practicals; if, for example, you were doing a titration of some kind, and you just finished doing a rough titration. Then, when you are going to pour the conical flask containing the alkali and the pH indicator down the sink and prepare to refill it with the alkali and...
  15. aalmuhannadi

    AS-CHEMISTRY TOPICAL FINALLY HERE

    What is the range of years (of past papers) for these questions?
  16. aalmuhannadi

    Chemistry: Post your doubts here!

    But the answer is B for some reason? :/ EDIT: oh no sorry you're right it's D, thanks!!
  17. aalmuhannadi

    Chemistry: Post your doubts here!

    How would you determine the change in pressure in this question?
  18. aalmuhannadi

    Chemistry: Post your doubts here!

    Anyone know how to do this please? I know the answer has to be either A or C since it's trans, but I have no clue how to calculate the number of double bonds... I thought it would be two as there's a C=C double bond in a cyclohexene ring and the other is given in the question between Carbons 11...
  19. aalmuhannadi

    Physics: Post your doubts here!

    Plus, how could te amplitudes at the minima even decrease because I thought that it must always be 0?!
  20. aalmuhannadi

    Physics: Post your doubts here!

    I thought that in phase waves cause constructive interference? and I understand that but what does the amplitude and path difference have to do with it?
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