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  1. Tekno-M

    Maths --> What if you wrote the working with Pencil in Paper 2? [HELP!!!!]

    What I know is that, if this is not said in the question: "show your working", your working really does not matter, it just gives you marks in case your actual answer is wrong. So if your answers are correct, I guess you have nothing to worry about. I'm still curious why you wrote it in pencil...
  2. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I think the acid/base will only become less concentrated, and I don't think concentration affects pH.
  3. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Because every molecule of hydrogen has to hydrogen atoms, each of relative atomic mass 1, so the relative atomic mass of a molecule of hydrogen is 2, so 2x8 = 16 which is the relative atomic mass of an oxygen atom. So the relative atomic mass of 1 atom of oxygen = the relative atomic mass of 8...
  4. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Wow... I don't know, but I think it's because they said which student CAN be correct.
  5. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Because in B, something caused the RATE of population increase to increase, i.e. a limiting factor.
  6. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The problem here with your answer is that you are asking questions according to the suggested conclusions, no, you should ask questions according to the information given.
  7. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    No no, it will decompose to copper and oxygen.
  8. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The given information is that Element Y has 8 more than X, only. So, the students are asked to draw conclusions according to this information. So one student says they MUST be in the same group, and the other says they MUST be unreactive. The second student is obviously incorrect because it can...
  9. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    It's an oxide, and oxides do decompose upon heat, also copper is a very unreactive metal ( down in the reactivity series ) meaning its oxide decomposes more easily than the more reactive metals.
  10. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Yes, unreactive metals are noble gases. But as I said before, If you read throughout the answer I gave and the example, you would see that it is not necessary a noble gas, it could be any group, but the two elements must be in the same group.
  11. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I think because B, C and D are all invalid for the answer because they will lose mass since copper (II) oxide will decompose I think to copper and oxygen, and the oxygen will be lost so the mass will decrease. Copper (II) carbonate when heated forms copper oxide and carbon dioxide, carbon...
  12. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I think the answer is B, because they never said that it is a noble gas, so let's take for example as element X instead of argon, sodium, sodium's proton number is 11, and they say that element Y has 8 more electrons than element X, so 11+8 = 19, 19 is the proton number of Potassium. So it is...
  13. Tekno-M

    English as Second Lang......

    Isn't it over? Or are you preparing for the October/November session ?
  14. Tekno-M

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I think the question is missing some information, because for the aqueous sodium chloride, if it is concentrated, chlorine is produced at the anode, but if it's dilute, oxygen is produced. And sodium hydroxide is produce either way, concentrated or dilute. But molten sodium chloride only gives...
  15. Tekno-M

    XBOX or PS3

    PS3.
  16. Tekno-M

    Chemistry Variant 32 Paper Discussion

    It has a layered structure, and the layers can slide past each other.
  17. Tekno-M

    Chemistry Variant 32 Paper Discussion

    How can Al2O3 have a protective oxide layer? Al2O3 IS the oxide layer of aluminium, you cannot say that Al2O3 is covered with Al2O3... And plastic is flexible too.
  18. Tekno-M

    A question of chemsitry if anyone can answer

    i. tin ii. 4OH- + 4e- ==> 2 H2O + O2 iii. Sulfuric acid.
  19. Tekno-M

    Are Grade thresholds true????

    I take CIE.
  20. Tekno-M

    Chemistry Variant 32 Paper Discussion

    I also think that any strong acid will score the mark.
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