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    Limestone is an alkali
    Sulfur dioxide is an acid

    They neutralise each other
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    any extractions of metal questions or anything metals please?
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    (Original post by Obnox)
    file:///Users/John/Downloads/AQA-CH1HP-QP-Jun12.pdf
    hope this helps
    hahahah it doesn't
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    (Original post by Love123443)
    Give the uses of polymers?
    Plastic bags, hydrogels, wound dressings.
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    (Original post by Love123443)
    Give the uses of polymers?
    Mainly used to make plastics, such as plastic bags. However, they can be made into smart polymers which have more than 1 property. For example nitinol is a smart polymer used in braces. It is cold forged and when put in the mouth it tries to go back to its original shape due to the high temperature, so it moves the teeth slowly into that shape.
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    Thanks for your help guys
    (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
    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 Love123443)
    Give the uses of polymers?
    Plastic bags
    Hydrogel wound dressings (hydrogel keeps the wound moist)
    Dishwasher tablets
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    (Original post by ASSISTER)
    hahahah it doesn't
    Are you sure? Copy the link into a new tab and it should work
    • Thread Starter
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    Earth is made up of
    78% nitrogen
    21% oxygen
    other gases

    early atmosphere may have been ammonia, methane, co2 and water
    methane reacted w/ oxygen to form carbon dioxide and water, so methane decreased.
    water vapour condensed, due to cooling conditions, because carbon dioxide in the atmosphere decreases as plants and algae evolved which used carbon dioxide for photosynthesis and co2 was getting locked up in sedimentary rocks. so water vapour condensed to form oceans, so EVEN MORE carbon dioxide was removed by being absorbed by the oceans. ammonia reacted with oxygen to produce nitrogen and water, therefore the percentage of nitrogen and oxygen increased.
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    Describe the reactions between metals of group 1 with water and oxygen.
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    (Original post by whyaqawhy)
    any extractions of metal questions or anything metals please?
    Compare extracting metals using reduction and extracting metals using electrolysis.

    Compare purifying metals using electrolysis and purifying metals using displacement.

    Reduction using carbon is one method of extracting copper. Describe two alternative methods of extracting copper from its ore.

    Why are metals soft but alloys hard?
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    (Original post by Obnox)
    Are you sure? Copy the link into a new tab and it should work
    nah u linked it from ur hard drive i can't access that m8
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    Group 1 metals alkali metals) react with water to produce an alkaline solution (hydroxide) and hydrogen gas. When group 1 metals react with oxygen they form an oxide.
    (Original post by ASSISTER)
    Describe the reactions between metals of group 1 with water and oxygen.
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    (Original post by ASSISTER)
    nah u linked it from ur hard drive i can't access that m8
    O ye oops, i got that link with a hyperlink from this website tho, i will look for it.
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    (Original post by Obnox)
    O ye oops, i got that link with a hyperlink from this website tho, i will look for it.
    cheers m8
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    (Original post by Love123443)
    Group 1 metals alkali metals) react with water to produce an alkaline solution (hydroxide) and hydrogen gas. When group 1 metals react with oxygen they form an oxide.
    20 love
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    (Original post by ASSISTER)
    Describe the reactions between metals of group 1 with water and oxygen.
    Metal in group 1 react with water to form a metal hydroxide which is alkali + hydrogen.
    Metals in group 1 react with oxygen to form a metal oxide.

    What are the advantages and disadvantages of using polymers for plastic bags?
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    (Original post by ASSISTER)
    cheers m8
    gcse june 2012 aqa c1 exam past paper watchThe link was from this forum
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    (Original post by RubiksNinja)
    Metal in group 1 react with water to form a metal hydroxide which is alkali + hydrogen.
    Metals in group 1 react with oxygen to form a metal oxide.

    What are the advantages and disadvantages of using polymers for plastic bags?
    most polymers are not biodegradable, uses landfill site, it uses a lot of energy to make=burning fossil fuels=global warming.

    ads=can be reused, recycled and it helps carry stuff, can be burnt to release energy, it is possible to include chemicals that cause the polymer to break down more quickly = cornstarch
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    (Original post by RubiksNinja)
    Metal in group 1 react with water to form a metal hydroxide which is alkali + hydrogen.
    Metals in group 1 react with oxygen to form a metal oxide.

    What are the advantages and disadvantages of using polymers for plastic bags?
    Advantages: polymers are are flexible but are still quite hard.


    Disadvantages: polymers are not biodegradable so it is hard to dispose them
    polymers are expensive to make as the polymers made for plastic bags which are low density need high temperature and pressure.

    Idk if any of those are right, can anyone confirm and perhaps add more?
 
 
 
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