• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. Maz

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

    The main composition of dry air is nitrogen and oxygen. Since,nitrogen is 78% in air. 78/100*x=120 ( as all of the oxygen is used up) x=120*100/78 x=153 The nearest is 150.
  2. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    No problem!:)
  3. Maz

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

    Since the total mass is 160, how much does Sulphur contribute to it? = 64 (Cu) + 32 ( S) + 16*4 (O2) Therefore, sulphur contributes 32g of the total 160g.
  4. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    10) small tip about balancing - always keep the balancing of oxygen and hydrogen for the last. 13) you have to know the electrolysis of molten lead bromide. 14) Since both of them are positive. 15) sorry. 16) Using fuels is always exothermic and hydrogen is oxidised to H2O, uranium only emits...
  5. Maz

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

    4) B- we have to use the periodic table for this question. Element S is argon, so using the periodic table, the only logical answer is B, since the next element 'K', neither has one more electron in it's outer shell, nor is the same group or period as argon.
  6. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    The question says inert electrodes, price isn't what we have to consider. And aluminium cause overhead cables are made of aluminium.
  7. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    An excess of copper oxide is added to the acid, meaning that the salt is added in such quantities that no more of the salt can dissolve in it anymore i.e the acid has become saturated.
  8. Maz

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

    No problem!(y)
  9. Maz

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

    When viewing closer objects.
  10. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Assalaamu alaikum. When 5g of X was dissolved in 1000 cm3 of water,there was a temperature change of 10. When dissolving in 500 cm3 of water it has lesser water particles to react with, therefore the temperature change would double.
  11. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    This thread is for physics, chem,bio. Anyways, English mainly depends on practice and reading. Although, most probably, the textook might help you for knowing the format of essays ,etc.
  12. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    37 is A and 40 is C.
  13. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    The answer's D. Almost all of the energy is lost by the fourth or fifth trophic level. The other options aren't related to energy.
  14. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Cause yesterday there was a HUGE debate on this itself.
  15. Maz

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

    dry mass is total mass of the organism after deducting the water's mass, ie after drying the organism.
  16. Maz

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

    It's a cross section, meaning only half of the plant is show. So, if you can see 4 stamens, the plant really has 8.
  17. Maz

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

    Variant 1? 26) D- you have to remember that the pod was earlier the carpel.So the pollen enters through the topmost part (stigma) 28) D- germinating does not involve an increase in dry mass. ( don't know the reason) 30) A- Since Y and 2 X chromosomes cannot be found in a female gamete.
  18. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    Maltose isn't found in the human body
  19. Maz

    Physics, Chemistry and Biology: Post your doubts here!

    19) D - the oxygen level drops in the first test tube due to the germinating seeds, causing the water level to rise. 20)D - salts and urea are carried by the blood (remember renal arteries), hormones are usually carried by blood. 38)B - You have to learn the phases.
  20. Maz

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

    The ans is B. Since one of the offspring is white, there should be a b allele coming from both the parents. As there is no option for a white parent we can assume that both of the parents are heterozygous ( genotype) and phenotype is brown.
Top