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  1. Namehere

    Chemistry: Post your doubts here!

    Here you have to use Q = mcΔt Therefore Q=(25+25)(4.18)(2.5) Q = -522.5 J mol-1 (Q is negative because heat is given off, shown by the rise in temperature - the reaction is exothermic.) D is the answer
  2. Namehere

    Chemistry: Post your doubts here!

    Q9 - B ---> Here you have to make two redox reactions (the one they give to you plus the half-equation for the metal ion in the salt) and balance them. The metalic salt reaction would be something like: 2X^3+ + 4e^- --> 2X^x (equation (1) ) The balance: in the equation of the...
  3. Namehere

    Chemistry: Post your doubts here!

    Q20- C -> A Nucleophilic addition reaction usually occurs when there is a C double bond, in this case at the second stage of the reaction the aldehyde (contains double bond) is joined with an oxygen, due to their difference in electronegativity a dipole is set up, leaving the carbon atom with a...
  4. Namehere

    A level Biology: Post your doubts here!

    Q15 - C -> You can see that the graph for the 3-Carbon sugar is the same in both graphs, however on the 6-carbon sugar the graph is a straight line when nitrogen is used. Air contains oxygen, which is used for many life processes. Since the 3-carbon sugar graph is the same when oxygen and...
  5. Namehere

    Chemistry: Post your doubts here!

    Np.
  6. Namehere

    A level Biology: Post your doubts here!

    np :D Hope u get Q36 anyways ^^
  7. Namehere

    Chemistry: Post your doubts here!

    For Q35 - 3 is incorrect because it is a "good" oxidising agent (Oxidising abilites of the halogens decrease as you go down the group). Astatine wants 1 more electron for it to be more stable therefore it needs to get reduced (OIL RIG - Reduction Is Gain of electrons), hence it is a good...
  8. Namehere

    A level Biology: Post your doubts here!

    Q1 - D, because the RER contains ribosomes which synthesise proteins, which are made of amino acids, hence radioactivity is first detected here. Q20 - C, because humans don´t use RNA, so reverse transcriptase is the enzyme responsible for converting the RNA into complementary DNA. Q22- B...
  9. Namehere

    (Dunno if you read my last post) How did your Chem P1 go, I took variant 11, was quite lenthy...

    (Dunno if you read my last post) How did your Chem P1 go, I took variant 11, was quite lenthy but good overall? Which variant did you take? How much do you think you will be getting? Hope your exams went well.
  10. Namehere

    Good luck! Im also sitting my AS examination so lets hope it all goes well!

    Good luck! Im also sitting my AS examination so lets hope it all goes well!
  11. Namehere

    Hello, i would like to know if you dont mind your age and if u have completed your A levels what...

    Hello, i would like to know if you dont mind your age and if u have completed your A levels what did u get at AS and A2. Your chemistry posts are really good, really helping me! Hope you answer me back :-)
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