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    (Original post by Obnox)
    How is copper extracted from copper sulphate using scrap iron and why is scrap iron used in the process?
    Copper extracted in a blast furnace - high temperature and scrap iron added. Scrap iron is used because it is cheap and more reactive than copper- it can therefore displace copper.
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    GN everyone good luck for tomorrow
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    (Original post by jackbarry1999)
    how are hydrocarbons cracked
    hydrocarbons are cracked using a process called thermal decomposition. Short chain hydrocarbons are more useful as they are things like fuels. The proerpties of short chain hydrocarbons include- high flammability, low viscocity and low boiling point which means it doesn't need much heat. So to carry out thermal decomposition we put the long chain hydrocarbon into a test tube along with a catalyst e.g broken ceramic pieces. We heat the ceramic and the long chain hydrocarbon will infuse/travel through this. It will exaporate and then as it gets cooler through the tube, it will become a liqud in the next tube which is the cracked/short chain hydroc
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    anyone got the 2012 paper, aqa took it down from their site?
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    (Original post by whyaqawhy)
    Copper extracted in a blast furnace - high temperature and scrap iron added. Scrap iron is used because it is cheap and more reactive than copper- it can therefore displace copper.
    Good answer.
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    Explain how sulfur dioxide is removed from power stations?
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    (Original post by whyaqawhy)
    its called extracting plant oils - its easy
    crush seeds - distill water from solution - leaving oil
    Right, just checked in my book and from my notes, I think there are 2 methods of extracting a plant oil and you need to know both of them, by the looks of it, but not into too much detail.

    One way is your method and the other way is, using the example of lavender oil, to put lavender in some water. Then apply heat to that water which will evaporate the water alongside with some lavender oil. Then, you condense the water and the lavender oil using a water cooling jacket which condenses them in layers due to the density. You can then either use a dropper to manually extract the lavender oil or use a tap (very much like the taps used in a burette) to slowly remove the water.
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    the june one
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    (Original post by ASSISTER)
    anyone got the 2012 paper, aqa took it down from their site?
    file:///Users/John/Downloads/AQA-CH1HP-QP-Jun12.pdf
    hope this helps
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    (Original post by 11masanda002)
    hydrocarbons are cracked using a process called thermal decomposition. Short chain hydrocarbons are more useful as they are things like fuels. The proerpties of short chain hydrocarbons include- high flammability, low viscocity and low boiling point which means it doesn't need much heat. So to carry out thermal decomposition we put the long chain hydrocarbon into a test tube along with a catalyst e.g broken ceramic pieces. We heat the ceramic and the long chain hydrocarbon will infuse/travel through this. It will exaporate and then as it gets cooler through the tube, it will become a liqud in the next tube which is the cracked/short chain hydroc
    ALong chain alkane( alkanes are the only hydrocarbons that will be cracked btw) are heated at a high temperature in the presence of a catalyst, producing a short chain alkane(s) and an alkene. I dont know if that much detail is required maybe saying thermal decomposition is good idk.
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    May I just mention the way the crusts move is NOT LIKE GEOGRAPHY?

    You have to say :

    Heat from radioactive processed in the mantle cause convection currents to occur. These drag the plates apart. An earthquake is caused by a sudden movement between plates
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    (Original post by Love123443)
    Explain how sulfur dioxide is removed from power stations?
    It reacts with a limestone stack to stop it reacting with rainwater to produce acid rain.
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    (Original post by JakeMcLellan)
    New ones won't have been added pal, this revisin guide is top quality (trusting with my life on it. That and mygcsescience)
    What is dependant and independent variable?

    Posted from TSR Mobile
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    (Original post by Love123443)
    Explain how sulfur dioxide is removed from power stations?
    Calcium oxide is used react with the sulfur to form calcium sulfate???? thus removing the sulfur and producing oxygen instead idk where that came from
    edit: nvm its powdered calcium carbonate that reacts with sulfur to form calcium sulfate reducing chance of acid rain. thanks.
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    (Original post by IAmAnTroll)
    May I just mention the way the crusts move is NOT LIKE GEOGRAPHY?

    You have to say :

    Heat from radioactive processed in the mantle cause convection currents to occur. These drag the plates apart. An earthquake is caused by a sudden movement between plates
    Very true lol, i do geography as well so thats the first thing i think of.
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    (Original post by IAmAnTroll)
    What is an ore?

    How are metals extracted from their ore?
    An ore is a rock containing enough metal to make extracting it worth while.
    The metals are extracted from an ore using the process of electrolysis or reduction.

    Electrolysis is the seperation of a metal from its impurities. It includes an electrolyte which is a solution used in the process and two edectrodes- the anode and cathode. If we were to extract copper then the impure copper would be placed on the anode, there would be a solution (electrolyte) such as copper sulphate. As the electricity is processing the extraction, the copper ions will attract to the cathode (neg electrode) as copper is positive and opposites attract. The impurites will collect at the bottom as a sludge.

    Reduction is a process using carbon. This process is usually for mentals under carbon in the reactivity series. The carbon takes oxygen away from the metal
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    (Original post by whyaqawhy)
    Calcium oxide is used react with the sulfur to form calcium sulfate???? thus removing the sulfur and producing oxygen instead idk where that came from
    You can just say that limestone neutralises the sulfur dioxide.
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    (Original post by z_o_e)
    What is dependant and independent variable?

    Posted from TSR Mobile
    Dependent variable is what you measure. Independent variable is what you change.
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    Give the uses of polymers?
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    (Original post by IAmAnTroll)
    What are the two ways ethanol can be produced?
    One way is by using ethene and steam=ethanol
    However an alternative way is by using sugar and yeast. Sugar=carbon dioxide and ethanol
 
 
 
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