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  1. G

    hi..?

    for the 2nd and 3rd question, you should know the Right Hand Rule. this rule is used to judge the force direction where a electric stick is in a magnetic field . please refer the below pictures
  2. G

    hi..?

    hi, Shafium, the 1st question: we define the magnetic direction is from N to S, there is no reason, just a definition to make all people follow the same rule, refer the below picture
  3. G

    Carboxylic acid X forms one ester only with molecular formula C5H10O2,What could X be?

    thanks this web and Forums, now I am clear with this question, below is the analysis
  4. G

    Carboxylic acid X forms one ester only with molecular formula C5H10O2,What could X be?

    Dear everyone,I am a student from China. I am facing a problem which I couldn't get throuth. like the below picture. In my oppinion, the corrrect answer should be A, but the answer from CAIE is c. who can help me? thanks a lot and god bless you
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