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    (Original post by phspa)
    Sorry my friend I dont this is the part I'm struggling with . if you could point me in the correct direction I'd be greatly appreciative .

    thanks
    Here is a method for the question that I made, with explanations. (Here is a BBC bitesize explanation - http://www.bbc.co.uk/schools/gcsebit...gherrev2.shtml )

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    (Original post by Peppercrunch)
    Here is a method for the question that I made, with explanations. (Here is a BBC bitesize explanation - http://www.bbc.co.uk/schools/gcsebit...gherrev2.shtml )

    A true gentleman . thank you so much sir
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    Help please
    I thought the bond angle would be like 50 degrees just by looking at observation but the answers different
    Name:  ImageUploadedByStudent Room1463728553.911868.jpg
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    How does everyone remember the mechanisms? I can't for the life of me answer a question on drawing them!
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    (Original post by Bloom77)
    Help please
    I thought the bond angle would be like 50 degrees just by looking at observation but the answers different
    Name:  ImageUploadedByStudent Room1463728553.911868.jpg
Views: 104
Size:  58.4 KB


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    I would have but 109.5? 4 bonded regions and tetrahedral

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    Can anybody add the mark scheme for chemistry aqa plzzzzz
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    (Original post by Hunnybeebee)
    I would have but 109.5? 4 bonded regions and tetrahedral

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    The H-S-H has 3 bonded pairs and 1 lone pair so its a pyramidal strucutre, which would have a bond angle of 107 degrees?
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    (Original post by voltz)
    The H-S-H has 3 bonded pairs and 1 lone pair so its a pyramidal strucutre, which would have a bond angle of 107 degrees?
    Wouldn't the S-B bond have to come into account as a bonded pair too?

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    (Original post by voltz)
    The H-S-H has 3 bonded pairs and 1 lone pair so its a pyramidal strucutre, which would have a bond angle of 107 degrees?
    Cools
    The answer is between 95-107.5 degrees
    So you'd look at the shape. Gotcha


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    Noooooo I didn't zoom in on the diagram to see the lone pair of electrons my bad

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    These are the files that were within the attachment size limits for pdf. I think there was only a couple of files I couldnt upload so if you really need them let me know how I can share them.
    Attached Images
  1. File Type: pdf F321_MS_June15.pdf (195.3 KB, 36 views)
  2. File Type: pdf F321-01 QP Jun15.pdf (461.1 KB, 42 views)
  3. File Type: pdf F325-01 QP Jun15.pdf (517.2 KB, 35 views)
  4. File Type: pdf F324_MS_June15.pdf (608.2 KB, 47 views)
  5. File Type: pdf F324-01 QP Jun15.pdf (531.5 KB, 80 views)
  6. File Type: pdf F322-01 QP Jun15.pdf (486.4 KB, 34 views)
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    (Original post by IamJuggernaut)
    These are the files that were within the attachment size limits for pdf. I think there was only a couple of files I couldnt upload so if you really need them let me know how I can share them.
    Thanks man
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    http://qualifications.pearson.com/co...14.pdfquestion 8 help please. Finding order wrt to Br-
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    (Original post by Dinaa)
    http://qualifications.pearson.com/co...14.pdfquestion 8 help please. Finding order wrt to Br-
    The paper doesn't come up
    Can you link the paper again?


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    (Original post by Bloom77)
    The paper doesn't come up
    Can you link the paper again?


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    http://qualifications.pearson.com/co...e_20130114.pdf
    January 2013 unit 4 question 8- edexcel.
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    (Original post by Hunnybeebee)
    Wouldn't the S-B bond have to come into account as a bonded pair too?

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    Yeah, including that it has 3 if Im correct, 2 to the hydrogens and 1 to the B, and then a lone pair
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    (Original post by Dinaa)
    http://qualifications.pearson.com/co...e_20130114.pdf
    January 2013 unit 4 question 8- edexcel.
    Is the answer d) alizRin yellow R
    Because you are adding NaOH into ethanoic acid and NaOH is a strong base so the pH would go very high and by looking at the data booklet, the highest pH indication is D) alizarin yellow R


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    (Original post by Bloom77)
    Is the answer d) alizRin yellow R
    Because you are adding NaOH into ethanoic acid and NaOH is a strong base so the pH would go very high and by looking at the data booklet, the highest pH indication is D) alizarin yellow R


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    I would disagree since we aren't looking at the end point but in fact the equivalence point. The equivalence point for the titration between a weak acid and strong base is 9 so from looking at the data booklet I would say the answer is C, thymol blue (base) since the pH range for thymol blue (base) is 8.0-9.6 and 9 is in that range (none of the other options have a suitable range). Hope that helps, @dinaa
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    can someone help me with percentage uncertainty
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    a question for the set 2 papers of the new spec is confusing me
 
 
 
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