• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    In an electrochemical cell, chemical energy is converted into electrical energy, as you saw above. The electrical energy is detected by the voltmeter. In an electrolytic cell, electrical energy from a power source is converted into chemical energy, so that electrolysis can happen. Just...
  2. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    In either cases, the action of heat is basically the thermal decomposition of either. Highly reactive metals such as Na and K are more thermally stable when in the form of carbonates and hydroxides, and thus they will not decompose. However as a nitrate, the two will decompose to form a...
  3. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    The electrode with the more reactive metal, allows electrons to flow to the electrode with the less reactive metal. While this happens, electrical energy is produced due to the flow of the electrons.
  4. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    Glad I could help :)
  5. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

  6. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    http://www.xtremepapers.com/revision/gcse/chemistry/moles_and_empirical_formula.php
  7. Xylferion

    All things u need to know about Chemistry P1 &P3

    This guy's a really big fan of your work :O
  8. Xylferion

    How were your Physics P-1 and P-3?

    Don't mean to be rude, but based on my past mistakes. Don't count the chickens before the eggs hatch.
  9. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    Denser to rarer, is Sin R / Sin I. Do the rest from there, not allowed to say the answer, remember? :)
  10. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    The focal length is 3.0 cm. That means 3.0 cm from the centre of the lens. You draw this on both sides of XY, to the left and to the right. Then you label these points as F. Next it says that your object is at the 2.0 cm mark to the left of the lens, mark this point, and draw an object 2.0 cm...
  11. Xylferion

    Physics w08 BIG PROBLEM!

    The ray in 6 b is traveling from a denser medium to a rarer medium. When traveling from denser to rarer we use. n = Sir "r" / Sin " i " If we were going from rarer to denser it would be Sin "i" / Sin "r".
  12. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    There's no need to go all complicated and include stuff like the radiometer. Instead there's a much simpler experiment than what either of you want to use. Bring two surfaces, one black and the other white, close to a heat source. Attach a Coin to wax, and the wax to both surfaces. The better...
  13. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    In the syllabus it does say, describe the use of a diode and its use in rectification.
  14. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    First their asking you for the direction of the force, you have a current carrying conductor which is the wire. You automatically decide that this questions requires the use of Flemings left hand rule. Now the current is pointing towards you, so you point your central finger towards you, you...
  15. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    If you have the time, I suggest quickly reading through the syllabus content! Everything that CIE bases its questions of, is included there :)
  16. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    That's not covered in the IGCSE syllabus, however if you really want to know, even though you need to, read up on it here: http://www.allaboutcircuits.com/vol_3/chpt_3/4.html Edit:- CIE only wants you to be able to describe full wave and half wave rectification. All they want you to do is know...
  17. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    It weight of bar B acts directly below its centre of mass. So draw an arrow under the bar, where it says Iron bar B. For the next part of the question it asks you to find the distance, d, to the centre of mass. The total length of the bar is 1.4 m. Half of this is 0.7 m. The pivot is at 0.2...
  18. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    If you had actually taken the time to read your syllabus, you'd have known by now that a diode aids in making current flow in only one direction. So if you take alternating current, add a diode, you'll get direct current. This process is known as rectification. However you're only using 1...
  19. Xylferion

    Physics, Chemistry and Biology: Post your doubts here!

    The amplitude of one wave is 1.5 V. 5 waves would be 1.5 * 5 which is 7.5 V.
  20. Xylferion

    GUYS,, I DIDN'T DO WELL IN CHEMISTRY PAPER 6...

    I don't know but since it's catalytic cracking, I figured that since both the alkene and alkane are formed, that maybe the first tube could have been the alkane rather than the alkene.
Top