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  1. h4rriet

    Chemistry: Post your doubts here!

    You have to construct two balanced equations. You forget Al + 3/4O2 -> 1/2Al2O3 + H2O and use the mole ratio from this equation for the other equation.
  2. h4rriet

    How was Physics/12 paper?

    That's true; even the most difficult papers don't get to less than 30. Not paper 1s.
  3. h4rriet

    Chemistry: Post your doubts here!

    When there's a ring, there can't be a cis-trans isomer. 13. Construct a balanced equation and use mole ratios.
  4. h4rriet

    Chemistry: Post your doubts here!

    Check for cis-trans isomers.
  5. h4rriet

    Chemistry: Post your doubts here!

    Show me your working and I'll tell you where you went wrong.
  6. h4rriet

    Chemistry and Physics AS paper 12 MCQS

    An α-particle has a charge of 2+. It is a Helium nucleus. It does not make a gold nucleus radioactive.
  7. h4rriet

    Chemistry and Physics AS paper 12 MCQS

    26. You just draw all the alkenes you can get with C5H10. You can draw more than one C=C double bond in one isomer. You've also got to look out for cis-trans isomers. 29. C=C turns into COH-COH with cold, dilute KMnO4 and into C=O with hot, concentrated KMnO4.
  8. h4rriet

    AS Physics P1 MCQs Preparation Thread.

    Well, you do use the pivot they've given. (20x60)+(100x10)=50x. 14. The steel sphere is dropped from a height of h. It has g.p.e.=mgh. When it reaches the ground, all its g.p.e. turns into k.e. So mgh=1/2m(v^2). Now it's held at h/2 metres above the ground. So the g.p.e. it has is mgh/2. This...
  9. h4rriet

    As physics p1 MCQS YEARLY ONLY.

    It's given in the question.
  10. h4rriet

    AS Physics P1 MCQs Preparation Thread.

    P=Fv.
  11. h4rriet

    AS Physics P1 MCQs Preparation Thread.

    Just square cos45 because K.E.=1/2m(v^2) which shows that v has to be squared.
  12. h4rriet

    Chemistry: Post your doubts here!

  13. h4rriet

    Chemistry: Post your doubts here!

    Oct/Nov 2004 paper 1.
  14. h4rriet

    Chemistry: Post your doubts here!

    If you know the method, then you should be able to do the working too.
  15. h4rriet

    Chemistry: Post your doubts here!

    30. (30+30)-18 (mass of water)=the mass of ester we're supposed to get. 39. The compounds in 1 and 2 are made from C3H7 free radicals. The compound in 3 is made from C2H5 and C4H9 free radicals.
  16. h4rriet

    AS Physics P1 MCQs Preparation Thread.

    Use 1/2m(v^2)=mgh.
  17. h4rriet

    Chemistry: Post your doubts here!

    The mole ratio of H2O:H2:O2 is 2:2:1. So if H2O loses 0.2 moles, H2 will gain 0.2 and O2 will gain 0.2/2=0.1 moles.
  18. h4rriet

    Chemistry: Post your doubts here!

    1. Construct balanced equations for the combustion of 1 mole (10 cm3) of methane and ethane. Take the moles to be the volume. CO2 will be a product; it'll react with KOH, so you can minus the moles of CO2 from the total volume of the products (i.e. volume of CO2 + H2O). 1. Construct a balanced...
  19. h4rriet

    Chemistry: Post your doubts here!

    HERE YOU GO: Tell me if you still don't understand; I'll try and make it more clear.
  20. h4rriet

    Chemistry: Post your doubts here!

    Just a second, I'm uploading the answer.
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