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Recent content by Studydayandnight

  1. S

    Physics: Post your doubts here!

    Which process doesn't require energy to be supplied? A. Boiling B.Evaporation C.Freezing D.melting Isn't the correct answer Evaporation?? The mark scheme says C. :/
  2. S

    Physics: Post your doubts here!

    HELPPPPPP. Correct answer is C.
  3. S

    Physics: Post your doubts here!

    Isn't mm into m, 500 x 10^-3?
  4. S

    Physics: Post your doubts here!

    How do we do this? :'(
  5. S

    Physics: Post your doubts here!

    Where'd you get the 10 from?
  6. S

    Physics: Post your doubts here!

    HELPPP!!!!!!!! What's the answer?!
  7. S

    Physics: Post your doubts here!

    HELPPP Correct answer is C.
  8. S

    Chemistry: Post your doubts here!

    The products obtained by cracking an alkane, X, are methane, ethene and propene. The mole fraction of ethene in the products is 0.5. What is the identity of X? A C6H14 B C8H18 C C9H20 D C11H24 Correct answer is B.
  9. S

    Chemistry: Post your doubts here!

    Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, X, reacts with an excess of chlorine to form 5.287 g of a compound with formula XCl2. What is metal X? A barium B calcium C magnesium D strontium Correct answer is D.
  10. S

    Chemistry: Post your doubts here!

    The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) 2NH3(g) ∆H = –92kJ mol–1 Which statement is correct about this reaction when the temperature is increased? A Both forward and backward rates increase. B The backward rate only...
  11. S

    Chemistry: Post your doubts here!

    How is this C? HELPPPP
  12. S

    Chemistry: Post your doubts here!

    Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ∆Ho = –214kJ mol–1 I2(s) → I2(g) ∆Ho = +38 kJ mol–1 What is the standard enthalpy change of formation of iodine trichloride, ICl3(s)? A +176kJ mol–1 B –88kJ mol–1 C –176kJ mol–1 D –214kJ mol–1 Correct answer is B.
  13. S

    Chemistry: Post your doubts here!

    How do we solve this Correct answer is A. Question is: Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its Delta H by n?
  14. S

    Chemistry: Post your doubts here!

    Camphor is a white solid which was used to make the early plastic celluloid. Camphor contains the same percentage by mass of hydrogen and oxygen. What is the molecular formula of camphor? A C10H6O6 B C10H8O C C10H16O D C10H10O2 Correct answer is C, how??
  15. S

    Chemistry: Post your doubts here!

    How is this C?
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