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Thread: HSC 2016 Chemistry Marathon

  1. #151
    Ancient Orator leehuan's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by Flop21 View Post
    Can someone double check my answers and help me with the one unanswered? They're the functional groups.

    The unanswered one looks like butanoic acid so

    (But the HSC course doesn't give proper references to ketones and aldehydes)

  2. #152
    Senior Member Shuuya's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by Flop21 View Post
    Can someone double check my answers and help me with the one unanswered? They're the functional groups.

    The unanswered one is a carboxylic acid.
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    Quote Originally Posted by leehuan View Post

  3. #153
    Supreme Member Flop21's Avatar
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    Re: HSC Chemistry Marathon 2016

    Thanks are the rest correct?
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  4. #154
    Ancient Orator leehuan's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by Flop21 View Post
    Thanks are the rest correct?
    Quote Originally Posted by leehuan View Post
    The unanswered one looks like butanoic acid so

    (But the HSC course doesn't give proper references to ketones and aldehydes)
    This implies I don't know

    (wait for a proper scientist not me to show up)

  5. #155
    Exalted Member BlueGas's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by leehuan View Post
    The unanswered one looks like butanoic acid so

    (But the HSC course doesn't give proper references to ketones and aldehydes)
    Ketones and aldehydes are mentioned in biology (uni level), and her questions wasn't HSC targeted as it's a university question

  6. #156
    Ancient Orator leehuan's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by BlueGas View Post
    Ketones and aldehydes are mentioned in biology (uni level), and her questions wasn't HSC targeted as it's a university question
    You'd think I have figured that given Flop is in our cohort.

    It just means posting it here (in the HSC marathon) might not guarantee an answer.

  7. #157
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    Re: HSC Chemistry Marathon 2016

    Uni-level Q's should probably be posted in the university Science threads in order to maximise chances of getting the question answered.

  8. #158
    Supreme Member Flop21's Avatar
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    Re: HSC Chemistry Marathon 2016

    I'm doing intro chem which is equivalent HSC chem, so hence why I've been posting here.

    Cool seems we're at uni level now.
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  9. #159
    Retired Nov '14 someth1ng's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by Flop21 View Post
    Can someone double check my answers and help me with the one unanswered? They're the functional groups.

    Top middle is a ketone. The -COOH denotes a carboxylic acid.
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  10. #160
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    Re: HSC Chemistry Marathon 2016

    5.00g table salt was dissolved in a 250L flask. He took a 10mL sample and diluted it to 1L for analysis. The absorbance was measured at 0.804.

    From graph, 0.804 corresponds to 50ppm of sodium (50mg/L). Plz halp

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    Exalted Member BlueGas's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by wesadora View Post
    5.00g table salt was dissolved in a 250L flask. He took a 10mL sample and diluted it to 1L for analysis. The absorbance was measured at 0.804.

    From graph, 0.804 corresponds to 50ppm of sodium (50mg/L). Plz halp
    What's the question?

  12. #162
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    Re: HSC Chemistry Marathon 2016

    The question is
    From graph, 0.804 corresponds to 50ppm of sodium (50mg/L). Plz halp

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    Re: HSC Chemistry Marathon 2016

    -ide - elements that react without oxygen
    -ite - Elements that reacted with one less oxygen than they normally bond to
    -ate - Elements that reacted with the number of oxygen molecules that they normally bond to
    -per/ate-Elements that reacted with one additional oxygen molecule than they normally bond to

    Help, I don't understand this. Isn't H2O called dihydrogen oxide so why does it have the ide ending? There's also CO and others...
    And what do they mean by one less oxygen than they normally bond to? etc?

  14. #164
    Retired Nov '14 someth1ng's Avatar
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    Re: HSC Chemistry Marathon 2016

    Quote Originally Posted by mini8658 View Post
    -ide - elements that react without oxygen
    -ite - Elements that reacted with one less oxygen than they normally bond to
    -ate - Elements that reacted with the number of oxygen molecules that they normally bond to
    -per/ate-Elements that reacted with one additional oxygen molecule than they normally bond to

    Help, I don't understand this. Isn't H2O called dihydrogen oxide so why does it have the ide ending? There's also CO and others...
    And what do they mean by one less oxygen than they normally bond to? etc?
    -ide is usually an elemental ion (eg fluoride/F-, chloride/Cl-, azide/N3-).
    -ide and -ate: when an element forms two different oxyanions (a polyatomic anion that contains oxygen), the one with less oxygen is -ite while the one with more oxygen is -ate (eg nitrite/NO2- vs nitrate/NO3-, sulfite/SO32- vs sulfate/SO42-)
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  15. #165
    Taking a break! dan964's Avatar
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    Re: HSC Chemistry Marathon 2016

    Closing thread. Please use the 2017 marathon.

    Thanks

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