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    (Original post by alyxgower)
    They have a lower boiling/melting point
    Give 3 properties of smart polymers

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    Whats the uses of polymers?
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    Difference between fractional distillation?

    Process of Fractional distillation (4)?

    How can you make resulats more accurate/realible?

    Properties polymers + smart polymers?

    Difference between polymers and smart polymers?

    What is smelting?

    How are plant oils extracted?

    These are the questions I dont know the answers to lol
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    (Original post by j3ss1cah)
    A mixture of carbon and hydrogen atoms chemically bonded as compounds? Is that right
    Depends. In Edexcel IGCSE, what are hydrocarbons is a two mark question. One mark for saying they're a compound hydrogen and carbon and another marks for "only". So a compound that only contains hydrogen and carbon.
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    (Original post by shohaib712)
    Difference between fractional distillation?

    Process of Fractional distillation (4)?

    How can you make resulats more accurate/realible?

    Properties polymers + smart polymers?

    Difference between polymers and smart polymers?

    What is smelting?

    How are plant oils extracted?

    These are the questions I dont know the answers to lol
    I can't be bothered to answer them all but seeds are crushed then pressed between two metal plates to extract the oil. Smart polymers return to a remembered shape and results can be reliable by making sure they're reproducible and repeating then taking a mean.
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    How is poly(ethene) made?
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    (Original post by alyxgower)
    I can't be bothered to answer them all but seeds are crushed then pressed between two metal plates to extract the oil. Smart polymers return to a remembered shape and results can be reliable by making sure they're reproducible and repeating then taking a mean.
    would you get the mark for mentioning that they can be extracted using a solvent and distillating it too?
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    (Original post by roryburke901)
    How is poly(ethene) made?
    Addition reaction of Ethene. Breaking it's double carbon carbon bond, and using it to bond to other ethane/ethene molecules?
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    The number of 15 year old smokers in the UK is 3.5691 x 10^4
    The number of 15 year olds in the UK is 7.647 x 10^6

    What is the percentage of 15 year old smokers in the UK?
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    (Original post by IAmAnTroll)
    The number of 15 year old smokers in the UK is 3.5691 x 10^4
    The number of 15 year olds in the UK is 7.647 x 10^6

    What is the percentage of 15 year old smokers in the UK?
    .5% to 1 S.F
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    (Original post by IAmAnTroll)
    The number of 15 year old smokers in the UK is 3.5691 x 10^4
    The number of 15 year olds in the UK is 7.647 x 10^6

    What is the percentage of 15 year old smokers in the UK?
    We won't get something like this chemistry is always on topic so I'll be very surprised to receive something like this again. Anyway answer is above
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    whats the melting point of aqa gcse biology students
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    South america and africa fit and they share the same fossil fuels
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    (Original post by PC.police)
    Addition reaction of Ethene. Breaking it's double carbon carbon bond, and using it to bond to other ethane/ethene molecules?
    Pretty much.

    - Many ethene molecules reacted together
    - Breaking the double carbon bond, so it is now only ethane molecules
    - Creating a long chain of hydrocarbons
    - This is called a polymerisation reaction
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    (Original post by shohaib712)
    would you get the mark for mentioning that they can be extracted using a solvent and distillating it too?
    Oh yeah I forgot about that! You would, if it's more than a 2 mark question I'd say mention both ways.
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    (Original post by alyxgower)
    Oh yeah I forgot about that! You would, if it's more than a 2 mark question I'd say mention both ways.
    How is fractional distillation done?


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    (Original post by z_o_e)
    How is fractional distillation done?


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    Crude oil is made of hydrocarbons, it is entered in a fractionating column and is heated. As it vaporises those with lower boiling points rise up to the top of the column and condense, leaving as fractions. This is because the top of the column is cool and the bottom hot. Those with higher boiling points leave at the bottom as they are longer chain molecules.

    Why is copper suitable for wires?
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    (Original post by alyxgower)
    Crude oil is made of hydrocarbons, it is entered in a fractionating column and is heated. As it vaporises those with lower boiling points rise up to the top of the column and condense, leaving as fractions. This is because the top of the column is cool and the bottom hot. Those with higher boiling points leave at the bottom as they are longer chain molecules.

    Why is copper suitable for wires?
    -good conductor
    -does not react with water

    😂


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    Why do we recycle gold and Aluminium?
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    (Original post by Dizgurl)
    Why do we recycle gold and Aluminium?
    Not sure...
 
 
 
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