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  1. Penalopi

    chemistry p3 IGCSE !! (some important points)

    You need to know: -The chemical and physical test for water -The purification of water- sedimentaion, filtration and chlorination -All about air polltuion: =Carbon monoxide: produced as a result of incomplete burning and causes the formation of carboxyhaemoglobin in the human body. = Sulphur...
  2. Penalopi

    Chemistry Doubts: IGCSE Paper 3

    oh, ok thanks :] good luck!
  3. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    Naphtha*
  4. Penalopi

    Chemistry Doubts: IGCSE Paper 3

    How many carbon atoms does a substance fractionating in the Naphtha column have? e.g. From 1--> 5 carbon atoms fractionate as refinary gases
  5. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    Question: Is Naphta used as a fuel or just for house-heating systems? Which fraction exactly is it collected at? The book says nothing about it!
  6. Penalopi

    Chemistry Doubts: IGCSE Paper 3

    No, the hydrogen molecules discharge at the Cathode- the negative electrode- since the H ions are positive. The oxygen discharges at the postive electrode- the anode. It's impossible to be the other way around. The chemical cell has no anodes and cathodes- the positive terminal is at the side...
  7. Penalopi

    Chemistry Doubts: IGCSE Paper 3

    Is Naphta used for a fuel or just for heating systems? And which fraction exactly does it come out from? The book says nothing about it!
  8. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    The grade boundries are getting lower every year so I'm guessing it would be an A this year :) If you're aiming for an A* in the end you have to get a max of 3 faults in paper 1, 10 in paper 3 and 5 in paper 6 ( my teacher told me this)
  9. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    About 80% , it's different every year
  10. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    anytime :)
  11. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    It's a B :)
  12. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah! It's worth at least 1 mark
  13. Penalopi

    Physics, Chemistry and Biology: Post your doubts here!

    yeah! It's worth at least 1 mark
  14. Penalopi

    Help please :(

    Acids are proton doners ( give out H+ ions) and bases accept them (proton acceptors) . Strong acids and bases undergo complete ionisation e.g. When NaOH or HCL react all their particles will be turned into ions. ACIDS: -turn the colour of litmus paper red -react with metals to produce a salt +...
  15. Penalopi

    Chemistry paper 3

    Tests for cations, anions and gases... I don't think it's coming though, it comes more on paper 6
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