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****Leaving Certificate Chemistry [All Levels] Before and After Discussion****

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    #362
    robman60
    Registered Users Posts: 2,222 ✭✭✭robman60


    EoghanIRL wrote: »
    Q3 (f) is the answer that the rate of reaction is decreased by 1/2 because sodium thiosulfate is the limiting reagent and rate of reaction is affected by concentration ?

    I wasn't sure, but I said it reduced the rate of the reaction. I was going to say it halved it, but that would mean they were directly proportional (straight line through origin), but they were only proportional, not directly I think.


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    #363
    matthew8
    Registered Users Posts: 9,599 ✭✭✭matthew8


    robman60 wrote: »
    I wasn't sure, but I said it reduced the rate of the reaction. I was going to say it halved it, but that would mean they were directly proportional (straight line through origin), but they were only proportional, not directly I think.

    For concentration it is a linear relationship so half would've been right.


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    #364
    randylonghorn
    Moderators, Education Moderators Posts: 29,509 Mod ✭✭✭✭randylonghorn


    Caolan wrote: »
    Same reason they make you do a foreign language - most of the 3rd level courses demand a science and european language (not all)

    it doesnt make sense when your 17/18 and are focused on something that doesnt need it- but as someone who didnt do a science at LC- it closes alot of doors later in life should you wish to apply for many courses.
    In fairness, a large amount of courses in colleges DON'T require a science. A language requirement is more common, especially in the NUI.

    I agree with you that it closes some doors, but for a small minority of students those doors aren't a realistic prospect anyway ... they have no interest in or aptitude for sciences, and will struggle with them even at Junior Cert, let alone Leaving Cert.

    I would certainly agree with schools strongly encouraging students to keep on a science for LC, and to keep their options open, but a school making it completely mandatory to my mind is a step too far. It actually ends up disadvantaging those students with no aptitude for them when it comes to points etc., as they are carrying a subject that they constantly struggle with and which they never wanted in the first place.


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    #365
    Mahmoudsaid_1
    Registered Users Posts: 28 ✭Mahmoudsaid_1


    can anyone solve this equilibrium question?
    10 moles of nitrogen and 30 moles of hydrogen were mixed and allowed to come to equilibrium in a sealed 5 litre vessel. There were 15 moles of ammonia in the vessel at equilibrium. Find the number of moles of hydrogen and nitrogen present in equilibrium and hence find Kc
    N2 + 3H2 -> 2NH3


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    #366
    ko3p
    Registered Users Posts: 37 ✭ko3p


    Mahmoudsaid_1 wrote: »
    can anyone solve this equilibrium question?
    10 moles of nitrogen and 30 moles of hydrogen were mixed and allowed to come to equilibrium in a sealed 5 litre vessel. There were 15 moles of ammonia in the vessel at equilibrium. Find the number of moles of hydrogen and nitrogen present in equilibrium and hence find Kc
    N2 + 3H2 -> 2NH3

    Here you are: i.imgur(dot)com/EkyU6hR.jpg?1


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