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    (Original post by ryanb97)
    well its a module from MIT .. or Harvard.. i think it will be worth something

    oh and its

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    No need for the sarcasm:rolleyes:, I've just started the MIT Mechanics one.
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    Did I misclick on the Physics discussion thread instead of the chemistry one?
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    (Original post by IHTWFR)
    Did I misclick on the Physics discussion thread instead of the chemistry one?
    ?? This is chem... Link to physics is on first post.
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    I wonder if this is good for chemistry revision -
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    Good YouTube channel for chemistry (OCR Gateway); it covers C4/C5/C6!
    http://www.youtube.com/user/GCSEChemistryTeacher/videos
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    (Original post by BP_Tranquility)
    Good YouTube channel for chemistry (OCR Gateway); it covers C4/C5/C6!
    http://www.youtube.com/user/GCSEChemistryTeacher/videos

    Looks great!
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    Any one know how to tackle the six markers?

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    Which of these revision guides (equations for CFCs) is correct? Because both seem to make sense to me...

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    (Original post by BP_Tranquility)
    Which of these revision guides (equations for CFCs) is correct? Because both seem to make sense to me...

    Name:  ImageUploadedByStudent Room1370602070.784879.jpg
Views: 98
Size:  80.2 KBName:  ImageUploadedByStudent Room1370602079.801300.jpg
Views: 96
Size:  62.5 KB


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    They're both right because different reactions can happen when it comes to CFCs. I would learn the CGP one.
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    (Original post by AR-13)
    Any one know how to tackle the six markers?

    Posted from TSR Mobile
    Make sure you make 6 points, explain each one if it asks you to. Use proper scientific terminology.
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    Do you guys think the controlled assessment grade boundaries will go lower, cause everyone seems to have found them hard :confused:
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    Scenario:
    I do a titration and get the following readings (on how much alkali was needed to neutralise an acid):

    Rough titration: 24.5cm3
    Experiment 1: 25.7cm3
    Experiment 2: 24.4cm3
    Experiment 3: 25.4cm3

    And I want to find the average using the 3 most consistent results- which of these 3 results do I use? Do I use the rough titration value since it's consistent with titrations 2 and 3, or do I ignore this value since it wasn't a proper titration (and just a rough one)?
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    (Original post by BP_Tranquility)
    Scenario:
    I do a titration and get the following readings (on how much alkali was needed to neutralise an acid):

    Rough titration: 24.5cm3
    Experiment 1: 25.7cm3
    Experiment 2: 24.4cm3
    Experiment 3: 25.4cm3

    And I want to find the average using the 3 most consistent results- which of these 3 results do I use? Do I use the rough titration value since it's consistent with titrations 2 and 3, or do I ignore this value since it wasn't a proper titration (and just a rough one)?
    I wouldn't - to quote my revision guide:

    "The first titration you do should be a rough titration to get an approximate idea of where solution changes colour. You then need to repeat it a few times, making sure you get the same answer each time within 0.2 cm^3"

    I would actually ignore experiment 2's result as well, it looks anomalous as far as the 'within 0.2 cm^3' thing goes.
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    (Original post by andersson)
    I wouldn't - to quote my revision guide:

    "The first titration you do should be a rough titration to get an approximate idea of where solution changes colour. You then need to repeat it a few times, making sure you get the same answer each time within 0.2 cm^3"

    I would actually ignore experiment 2's result as well, it looks anomalous as far as the 'within 0.2 cm^3' thing goes.
    Okay, what if it was this :

    Rough titration: 24.5cm3
    Experiment 1: 24.6cm3
    Experiment 2: 24.4cm3
    Experiment 3: 24.4cm3
    Experiment 4: 24.7cm3

    Which 3 most consistent results would you use?
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    (Original post by BP_Tranquility)
    Okay, what if it was this :

    Rough titration: 24.5cm3
    Experiment 1: 24.6cm3
    Experiment 2: 24.4cm3
    Experiment 3: 24.4cm3
    Experiment 4: 24.7cm3

    Which 3 most consistent results would you use?
    1, 2 and 3. I still wouldn't use the rough titration because, after all, it's 'rough'. Even though it's 0.1mL closer to experiment 2 and 3's data than experiment 1, the rough titration is less reliable since you're pretty much just pouring one substance into the other and seeing where abouts it neutralises.

    Obviously I'm no scientist, but that's what I would do.
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    So ... ?
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    (Original post by ryanb97)
    So ... ?
    C4 Six Marked on the additional was on the history of periodic tables...
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    I love how few topics there are for chemistry C456... Well especially in comparison with Biology.
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    (Original post by L'Evil Fish)
    C4 Six Marked on the additional was on the history of periodic tables...
    how do you know....have you got a copy of the paper?

    ryan
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    (Original post by ryanb97)
    how do you know....have you got a copy of the paper?

    ryan
    No my friends complained about it
 
 
 
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