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  1. Mathemagical

    Chemistry: Post your doubts here!

    Yes, I got 4 again too. :D
  2. Mathemagical

    Chemistry: Post your doubts here!

    Yes, I got 4 isomers each too.
  3. Mathemagical

    Chemistry: Post your doubts here!

    That's correct :)
  4. Mathemagical

    Chemistry: Post your doubts here!

    Radicals can be formed on the CH3 group on the far left, on the CH2 part beside it and either one of the three CH3 groups on the right.
  5. Mathemagical

    Chemistry: Post your doubts here!

    Ethanoic acid forms CH3COO- ions, whereas calcium forms Ca2+ ions. Therefore, one mole of calcium ions combines with two moles of ethanoate ions.
  6. Mathemagical

    Chemistry: Post your doubts here!

    Volume does not affect the rate of reaction, only the concentration does.
  7. Mathemagical

    Chemistry: Post your doubts here!

    Magnesium oxide decomposes at 2852 degrees Celsius, far beyond the temperatures Bunsen burners can provide.
  8. Mathemagical

    Chemistry: Post your doubts here!

    In separate reactions, 4 H and Br atoms will attach themselves to the carbon atoms. 4 atoms of H and Br is equivalent to 2 molecules of H2 and Br2, so the answer is A.
  9. Mathemagical

    Chemistry: Post your doubts here!

    The oxidation state of carbon is +4, so the oxidation state of sulphur is -2.
  10. Mathemagical

    Physics: Post your doubts here!

    It's simple common sense. Imagine a particle with a large mass but a small charge. It has a bigger inertia, so it would have a lower speed.
  11. Mathemagical

    Physics: Post your doubts here!

    Density = Mass/Volume Volume of sphere = 4/3*pi*r3 Percentage uncertainty of diameter = 0.02/2.20*100 = 0.909% Percentage uncertainty of mass = 0.005/0.506*100 = 0.988% Since the diameter has to be halved to find the radius and then cubed, we multiply the uncertainty by 3. Therefore...
  12. Mathemagical

    Physics: Post your doubts here!

    When the temperature is reduced, the resistance of the thermistor increases. Therefore, a larger proportion of the emf will flow across the thermistor and the voltmeter reading will increase.
  13. Mathemagical

    Chemistry P34

    It is not mandatory, but usually 1cm3 is enough to cause a colour change. However, avoid using volumes which are too large as a greater volume of the reagent would have to be added to cause a colour change.
  14. Mathemagical

    Physics: Post your doubts here!

  15. Mathemagical

    Physics: Post your doubts here!

  16. Mathemagical

    Physics: Post your doubts here!

    There is no such thing as a transverse sound wave. All sound waves are longitudinal.
  17. Mathemagical

    Physics: Post your doubts here!

    Power equals to the square of current multiplied by the resistance. Use this formula to work out the ratio.
  18. Mathemagical

    Physics: Post your doubts here!

    No, it has nothing to do with that. The element with the greatest mass to charge ratio has the lowest speed.
  19. Mathemagical

    AS Chemistry 2015 M/J

    Here are some tips for you: 1. For questions on titration, you should first perform a rough titration, then perform 2 accurate titrations. Record the initial burette reading and final burette reading for each titration, then calculate the titre. You should record everything in a table. All...
  20. Mathemagical

    Chemistry: Post your doubts here!

    Option 2 is correct because it takes less energy for HI to dissociate into H2 and I2 so there is a greater proportion of these gases in the equilibrium. Hence, the value of Kp is smaller.
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