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  1. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    I am sorry i have no answer for the first question. For the second, exothermic reactions involve forming bonds. eg freezing of water, where water molecules lose heat energy and bonds are formed. endothermic reactions involve breaking of bonds. eg. boiling of water, where water molecules take...
  2. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    It's zinc and the reason would be since the mass of zinc has become constant, it shows that there is no more iodine to react with the zinc.
  3. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Usually they would most probably specify what we are supposed to use or we have to deduce it as we did in this question.
  4. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Sn has the variable valencies of 2 and 4. While, Ag has the variable valencies 1 and 2.
  5. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Okay. Regarding the first part I just gave 2 images from the syllabus copy which i hope would make it easy.
  6. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Yes. (eg of a redox reaction)
  7. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    I didn't mean that to you. By the way, i hope this makes everything clear. (y)
  8. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    You'll have got me worried. As far as I know we do not need to know the monomers of terylene (or for that matter nylon too).
  9. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Yup.
  10. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Ozone causes cancer? that's the first i have heard of it.
  11. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Just make sure to note that there is a double bond between c and o (i forgot to make it).
  12. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    I meant except the drawing part.
  13. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    -co-[]-co-o-{}-o-co-[]-co-o-{}-o-
  14. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    I don't think we have to know all those details about terylene.
  15. Maz

    Chemistry Doubts: IGCSE Paper 3

    All nitrates decompose when heated. Sodium and potassium nitrates decompose to nitrite and oxygen. Nitrates of lesser reactive metals decompose to their oxides, nitrogen dioxide and oxygen.
  16. Maz

    Solving Chemistry Doubts Now :)

    Monomer: Small molecules that join together to form one large polymer molecule. Polymer: A very large molecule formed from many monomer molecules.
  17. Maz

    Chemistry Doubts: IGCSE Paper 3

    It is mass/molecular mass, only thing is that the subject has been changed. From: moles= mass/molecular mass. to: moles*molecular mass= mass.(since we have to find the mass). :)
  18. Maz

    Solving Chemistry Doubts Now :)

    Well, that helps me too. Thanx(y)
  19. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    The mole ratio between HCl and CoCl2 is 2HCl:1CoCl2 Therefore, 0.08:0.04. The same method is applied in the next one too.
  20. Maz

    Physics, Chemistry and Biology: Post your doubts here!

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