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  1. M

    Can i have the markschemes pretty pretty please?

    Hello people ! I cant believe that we r almost done with thoose igcse exams @_@ iam soo excited ,, arent u?!! Anyyhoww can anyone upload the markschemes for chemistry for 2000..2001...2002.. for both June and November pretty pretty pleeeeeease? Thankss!
  2. M

    Calculating heat chnge in a reacti using bond energy?:/

    Hello,,can anyone help me with this please ,, CH4 + 2O2 → CO2 + 2H2O Energy needed to break bonds: 4 (C-H): 435 x 4 = 1740 KJ/Mol 2 (O=O): 497 x 1 = 994 KJ/Mol Total energy in: 1740 + 994 = 2734 KJ/Mol Energy needed to form bonds: 2 (C=O): 803 x 2 = 1606 KJ/Mol 4 (H-O): 464 x 4 = 1856 KJ/Mol...
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