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    (Original post by GeorgeMillerr)
    No doesn't say anywhere in the specification about stress of metals I even checked using a the find tool on chrome and 0 results showed for, stress or metal fatigue
    mistake me if i'm wrong or direct me to the page number in the specification
    Really, It's on the bottom of page 23 of the revision guide (CGP)
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    (Original post by kefalos23)
    What is bromine water used for?
    To check for the amount of unsaturation in alkenes (breaks the C=C bond). If the bromine water turns from orange to colourless, then an alkene is present.
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    (Original post by kefalos23)
    What is bromine water used for?
    Test for unsaturation / differentiate between saturated/unsaturated fat or alkanes/alkenes.

    - Add Bromine water to compound
    - If it decolourises, it is an alkene/unsaturated

    The Br reacts with the compound and opens up the double bond so it decolourises.

    I only have pros/cons of poly(ethene) bags as a question but I think it's already been answered :/
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    (Original post by kefalos23)
    What is bromine water used for?

    To test if the substance is an alkane or alkene. It stays orange if its saturated, turns colourless if unsaturated.
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    (Original post by ritiik)
    ferementation of YEAST
    hydration of ethene
    It is fermentation of sugar canes using yeast, the yeast enzymes are what brakes down the sugar cane they are not used up
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    What are the building materials that can be made by limestone
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    Guys, what's a mixture?
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    A con of plastic bags are that they arent biodegradable, cause visual pollution when littered, take up landfill space and are not sustainable.
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    (Original post by kefalos23)
    What are the building materials that can be made be limestone
    Cement made frome limestone and clay
    mortar made from sand and cement and lime
    concrete is made from limestone, sand, aggregate and water in a rotating kiln
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    (Original post by chocomad1999)
    Really, It's on the bottom of page 23 of the revision guide (CGP)
    Using only the revision guide is a bad idea
    The REVISION GUIDE WAS MADE IN 2011!!!
    The Specification was made in 2014!!!
    - new topics have arose since then and old ones removed
    - the exam board make the specification whereas the CGP guide was made by a 'Independent company'
    *see what i did there with the pun xD
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    (Original post by kefalos23)
    What are the building materials that can be made be limestone
    Cement - Limestone + clay
    Concrete - Cement + sand + water + aggregate
    Mortar - Cement + sand + water
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    (Original post by kefalos23)
    What are the building materials that can be made be limestone
    Cement and Concrete?
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    (Original post by kefalos23)
    What are the building materials that can be made be limestone
    Limestone + clay= cement
    also cement +sand + water = mortar
    and cement + aggregate +clay = concrete
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    (Original post by GeorgeMillerr)
    Using only the revision guide is a bad idea
    The REVISION GUIDE WAS MADE IN 2011!!!
    The Specification was made in 2014!!!
    - new topics have arose since then and old ones removed
    New ones won't have been added pal, this revisin guide is top quality (trusting with my life on it. That and mygcsescience)
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    How has the concentration of different gases in the atmosphere changed over time?
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    (Original post by JakeMcLellan)
    Guys, what's a mixture?
    two or more element that exist together but are NOT CHEMICALLY COMBINED
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    (Original post by IAmAnTroll)
    two or more element that exist together but are NOT CHEMICALLY COMBINED
    Thank you dear
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    Easy one : What is the atomic and mass number of an element?
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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)
    Well I will guarantee there wont be anything about metal stress, this will resume tomorrow when my point is proven
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    Differences between molecules, particles and ions
 
 
 
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