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  1. S

    Mathematics: Post your doubts here!

    YEEES please do! I suggest solving pastpaper questions maybe? We don't get the explanation of the answers always, especially things like stats and mechanics.
  2. S

    Chemistry: Post your doubts here!

    In this case, the answer must be D. Since they mentioned bunsen burner, we know that MgCO3 is the one that went through decomposition, not barium compound since as you go down the group heir thermal stability increases and will require more energy that a burner cannot provide. The residue left...
  3. S

    Chemistry: Post your doubts here!

    I did 12, and it was horrible as well. The questions needed alot of time, and most questions were organic. If we had more time I'd say it was good. I had no time to check I just answered.
  4. S

    Chemistry: Post your doubts here!

    Idk why I have a feeling they'll get something annoying in redox reactions
  5. S

    Chemistry: Post your doubts here!

    Its really based on what you're dealing with, like what kind of reaction do you have and the kind of enthalpy you're trying to find.
  6. S

    Chemistry: Post your doubts here!

    I explained this before, here you go
  7. S

    Chemistry: Post your doubts here!

    Question 1, I think someone answered this so i'll skip it, Question 2, This question is very easy if you remember an easy concept, total mass of reactant=total mass of products. Since my reactant is 3g, and my gases are 1.53g , then the solid formed as a result is 1.47g When we're heating a...
  8. S

    Chemistry: Post your doubts here!

    Okay let me help, Question 1 : When you're completely combusting an alkene you would get CO2 and H20. If you take this example: C2H4+3O2=2CO2+2H20 As you can see, we had ethene(2 carbons) so we had to write (2)CO2 to balance the eqn, if you get the pattern i'm saying now you can solve it...
  9. S

    A level Biology: Post your doubts here!

    Any time :)
  10. S

    A level Biology: Post your doubts here!

    Is it D? Whatever is on the tRNA is the anticodon, and they gave you the list of codons, to make it really easy for you, under each tRNA molecule, write the codon, so i'll write this in a sequence from left to right, GUA,GAA,ACU,ACG (Incase you don't know anticodons and condons have...
  11. S

    Chemistry: Post your doubts here!

    I need genuine help here, I don't understand option C, I said A because I confused with C, the actual answer is B (btw this is section B) so one and 2 only are right
  12. S

    Chemistry: Post your doubts here!

    Is it B? If so, what I think is this, we know the Mr of KNO3 is 101.1 , and they gave us the actual mass so we know we have 1 mole of KNO3. To define Mr, we say it's the mass of particles that have the same no of atoms as in C-12 isotope, basically its the mass of a particle when it's one mole...
  13. S

    Chemistry: Post your doubts here!

    I literally have no idea. I think it'll have something about thermal decomposition, definitely titration and maybe maybe organic chemistry question in qualitative analysis, the last time they got organic was I guess 2016, I hope it's organic cause it's much easier. These are my assumptions...
  14. S

    A level Biology: Post your doubts here!

    Again, let me break this down for you. As I explain all the options you'll understand the answer. Why it's not A: When we say "contain something" that means that we're trying to modify something in order to be able to store it in. So, for example, we know the DNA is coiled around nucleosomes (8...
  15. S

    A level Biology: Post your doubts here!

    watch this and you'll understand what I meant :) might be easier to visualize while explaining.
  16. S

    Chemistry: Post your doubts here!

    34
  17. S

    Chemistry: Post your doubts here!

    Any predictions for paper 34? Definitely not enthalpy change tho/
  18. S

    A level Biology: Post your doubts here!

    I did 33 33 was seriously easy, I'm really worried about mcq now.
  19. S

    A level Biology: Post your doubts here!

    Hi there! I hope I am not late One thing I want to say, biology mch examiners are so good at playing with words. As you concentrate more on what they're saying you'll realize its much easier than you thought. Let me break this down, Why its not B: First, its the DNA that coils around histone...
  20. S

    Chemistry: Post your doubts here!

    Ah yes I wanted 33 but I chose 34 since I'll have arabic as first language on that day plus I have a week where in 4 days I have 5 board exams so I wasn't ready to add one more to the list :") Focus on your theory part for now and just don't be scared I think chem P2 will be a bit hard this year,
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