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  1. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    the answer is B, the palisade cells gain the most CO2 and lose the most CO2, idk why, i did it wrong when i did that paper :/
  2. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    yes, it isnt affected by the fuel, u only need a high temperature so that oxygen and nitrogen have enough energy to bond
  3. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    yea ethanol doesnt contain sulfur, there is nothing to explain, all u have to know is ethanol produces CO2 and water when combusted and that oxides of nitrogen and nitrogen arent affect by the fuel used, they will always be available. only sulfur dioxide is affected by the fuel used and ethanol...
  4. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    it is stay still in Q because CO2 produced is the same as O2 taken it by the animals and so there is no change in pressure, however at P it takes away oxygen and CO2 and so the pressure reduces this causes the spot to move to the left at P and stay still at Q so the answer is B
  5. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    ur right, i did that question before :D
  6. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    D it is sulfur dioxide because when u burn ethanol u release oxygen and water, however oxides of nitrogen and nitrogen occur and the fuel used has no effect on them, sulfur dioxide is the answer because it can only be made by the combustion of a sulfur containing fuel :D
  7. Abu mota

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    yea when they ask for the temperature change, they are asking for the temperature of the surroundings :D
  8. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    OK guyz im off to watch germany vs portugal. GO GERMANY!!!
  9. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    no thats wrong one vein is a tissue and one artery is a tissue but many arteries form an organ and many veins form an organ, but many veins and arteries and the heart form the organ system. ty just like just smile said :D
  10. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    why??? i do that everytime what is the problem with that? u have to learn from ur mistakes otherwise there will be no use in doing the papers :/
  11. Abu mota

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    ok i will explain it in a very simple way, this reaction is a basic reversible reaction if u start first with hydrated copper sulfate and u heat it this is the forward reaction and it is obviously endothermic, the backward reaction is when the anyhdrous copper sulfate is turned back to hydrated...
  12. Abu mota

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

    it is A because it is recessive so in order for the parents to have it they must homozygous recessive and so it is impossible to get a normal child u can draw a punnet square using small a for everything and u will find that all of the offspring genotype is aa. if u dont understand ask again :D
  13. Abu mota

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

    it is a non-metal, u have a stair case down the boron and one the right of this stair case u have nonmetals and on the left u have the metals and so the answer is C
  14. Abu mota

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

    yes u r right :) chem or bio? and which variant?
  15. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    carbon has a valency of 4 (as it is in group 4) but Chlorine has a valency of 1 (group 7) and so u write something like C4 Cl1 and u exchange the numbers and u will get CCl4 which is B. if u dont understand ask again :D
  16. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    and also for Q.19 u can check it if u want for K2Cr2O7 the oxidation state is -14 and K is 2+ and in order to cancel them u need +12 divided by 2 and Cr will have an oxidation state of 6. then for K2CrO4 oxidation state of oxygen is -8 while K 2+ and so to balance them u need +6 and so the...
  17. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    for Q.19 this isnot an redox reaction and so the oxidation numbers stay the same but the pH increase because the alkali increase the pH. for Q.22 it is D because zinc is actually not soluble in water and the only way in which u use liquids is in titration reaction and this isnt one :)
  18. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    the first column is just to confuse you so leave it, look at the second and the third column and u will find that only glucose and water decrerase while the others dont :) and so the answer is glucose and water which is A.
  19. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    srry i think i got the wrong paper :/ rlly srry for Q.36 it is B and yes it became saturated because there is no double bond anymore and remember its name is poly(ethene) for Q.40 the cotton wool is used to allow the CO2 to escape without oxygen entering, we dont use a bung because it will...
  20. Abu mota

    Physics, Chemistry and Biology: Post your doubts here!

    for Q.36 it is D u need to memorize the structures of all hydrocarbons, it cant be explained :/ for Q.40 it is D also because u need to memorize the conditions of the reactions u take, none of these questions can be explained, it can only be memorized :)
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