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AQA GCSE - Unit 3 (P3,B3,C3) New specification papers. Watch

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    (Original post by Obliviate)
    Describe the processes that prevent glucose being extracted in the urine :>

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    Active Transport. The GLucose is filtered and then it is absorbed back into the blood via active transport. There is a higher concentration of Glucose in the blood, but it can still move from low to high concentration with the use of energy from respiration...
    ? right?

    What are the uses of Carboxylic Acids?
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    Sorry, go to go!
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    Carboxylic acids can be used to make esters,dyes,soap, used in drinks and in drugs
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    how do you test for haliade ions?
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    (Original post by Blake-inator)
    Active Transport. The GLucose is filtered and then it is absorbed back into the blood via active transport. There is a higher concentration of Glucose in the blood, but it can still move from low to high concentration with the use of energy from respiration...
    ? right?

    What are the uses of Carboxylic Acids?
    yeah, that's right.

    Uses:
    - flavourings
    - preserving food
    - soaps and detergents
    - solvent
    - in preparation for esters.

    What is the difference between temporary and permanent hard water?

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    add dilute nitric acid, and silver nitrate solution
    Chloride -> white precipitate of silver chloride
    Bromide -> cream precipitate of silver bromide
    Iodide -> yellow precipitate of silver iodide

    How do CT scans work?
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    ^ test for halide btw
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    temporary hard water can have its hardness removed when boiled whereas, permanent can't however, it kind of can
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    (Original post by Captain Anonymous)
    temporary hard water can have its hardness removed when boiled whereas, permanent can't however, it kind of can
    But what causes them to be temporary and permanent? :>

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    temperory = calcium/magnesium ions
    permanent = sulfates

    that wasn't your original question
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    (Original post by Captain Anonymous)
    temperory = calcium/magnesium ions
    permanent = sulfates

    that wasn't your original question
    I know, I didn't worded it precisely, but that what I was looking for anyway :>

    Posted from TSR Mobile
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    ahahaa okay,

    YAAAAY! explain how an ester is made :L
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    (Original post by Captain Anonymous)
    ahahaa okay,

    YAAAAY! explain how an ester is made :L
    An Ester is made by reacting a Carboxylic acid with an alcohol. E.g Ethanoic acid + Ethanol --> Ethyl Ethanoate + water?
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    :eek: you forgot the sulfuric acid as a catalyst
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    (Original post by sneakbo2)
    Electromagnetic induction itakes place when a conductor experiences a changing magnetic field, and thus potential difference is created. So if you put a magnet inside coils of wire ( a solenoid), the magnet causes the magnetic field produced by the solenoid to change, thus potential difference is created. If you move the magnet in the opposite direction, it reverses the direction of potential difference and current. If you reverse the polarity of the magnet, it also reverses the potential difference and current. So if you keep moving the magnet backwards and forwards, This constantly reversing current is what creates an Alternating Current (AC). Then that leads on to how transformers work.
    You're a life saver dude! x

    WHY GIVE ME THE NEGATIVE REP?!? :mad:
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    (Original post by Captain Anonymous)
    :eek: you forgot the sulfuric acid as a catalyst
    Aww why so surprised loool
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    does anyone know aprox grade boundary for A* for biology exam because i got 53
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    (Original post by mh97)
    does anyone know aprox grade boundary for A* for biology exam because i got 53
    It depends which one, if you know just search it on Google, you are obviously smart enough to do it if you got 53
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    If your talking about the Speciment - it will be around 96UMS
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    revision game anyone?
 
 
 
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