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Recent content by dumbledore.

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    Chemistry and Physics AS paper 12 MCQS

    When equal volumes of saturated solutions of barium hydroxide and calcium hydroxide are mixed, a white precipitate, Y, forms. The mixture is filtered and carbon dioxide is bubbled through the filtrate, producing a second white precipitate, Z. What are Y and Z? Y Z A Ba(OH)2 Ca(OH)2 B...
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    Chemistry and Physics AS paper 12 MCQS

    student investigates four different fuels. Each fuel is used separately to raise the temperature of 1 dm3 of water from 20°C to 100°C. Each fuel undergoes complete combustion. All other conditions are the same in each experiment. Which fuel would produce the smallest amount of carbon dioxide in...
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    Chemistry and Physics AS paper 12 MCQS

    In which species does the underlined atom have an incomplete outer shell? A Al 2Cl 6 B CH3+ C Cl 2O D H2Cl C•
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    Chemistry: Post your doubts here!

    6 A substance commonly found in the house or garden has the following properties. • It is combustible. • It is an electrical insulator. • It melts over a range of temperature. What could the substance be? A brass B paper C poly(ethene) D silicon(IV) oxide Ans is C
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    Chemistry: Post your doubts here!

    plz helppp
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    Chemistry: Post your doubts here!

    It can form only coordination 4 which shows cis trans isomer . For cis chlorine should be 90 degree to each other while for trans both chlorine should be 180 degree to each other . Chorine placed anywhere other then 180 degree will only have 90 degree because all four are on same plane. Not to...
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    Physics: Post your doubts here!

    One possible nuclear fission reaction is 235 1 U + 092 n 141 1 56 0 Ba + 92 36 Kr + 3 n + energy. Barium-141 (141 56 Ba) and krypton-92 (92 36 Kr) are both β-emitters. Barium-141 has a half-life of 18 minutes and a decay constant of 6.4 × 10–4 s–1. The half-life of krypton-92 is 3.0 seconds...
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    Chemistry: Post your doubts here!

    Ans :21/9
  9. D

    Sharing my CIE A-level Chemistry notes [AS chapters completed]

    Ans : 21/9 how?
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    Physics: Post your doubts here!

    STRESS= FORCE/AREA Stress (wide) =F/[d^2] Stress (narrow)= F/[(d/2)^2] F and d^2 will cancel out each other by substituting them. StressW/StressN= [1]/[4] =0.25
  11. D

    ASK BIOLOGY DOUBTS HERE!!!!

    15. A Why is it not C?
  12. D

    Physics: Post your doubts here!

    34. C
  13. D

    Physics: Post your doubts here!

    A loaded aeroplane has a total mass of 1.2x10^5 kg while climbing after take off. It climbs at an agle 23 degree to horizontal with a speed of 50 m/s. what is the rate at which it is gaining potential energy at this time? ans: 2.3x10^7
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    Physics: Post your doubts here!

    Thankyou :)
  15. D

    Physics: Post your doubts here!

    Ans = D How??
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