Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    Offline

    2
    ReputationRep:
    (Original post by arj2104)
    How many marks was the Specific Heat Capacity question
    I think 3
    Offline

    0
    ReputationRep:
    what was the methane q
    Offline

    0
    ReputationRep:
    what did everyone write for question 1 with test tube 1 and 2?
    what about the catalyst used for esters?
    Offline

    0
    ReputationRep:
    The lowest boiling point was Rb
    Offline

    1
    ReputationRep:
    (Original post by Roquebrune2014)
    For bond energies I am 100% sure it should be (-)1,276. I wrote out all the bonds underneath next to their bond energies, added up each side of the reaction and checked the numbers 3 times (I finished quite early so thought I'd count up each side again)


    Posted from TSR Mobile
    Yep, I just told someone that not putting a minus won't lose you a mark but they had what I think was the wrong answer... I agree from what I remember that it's -1,276kJ/mol
    Offline

    14
    ReputationRep:
    (Original post by YAY GCSE)
    It was definitely an exothermic reaction which gave a negative enthalpy change and I'm 100%on this because at the start of the next question is said "this reaction is exothermic" lol
    I thought it said "this reaction is exothermic" on the following page. I remember because I was unsure if I had done the calc right (ending up with negative value) and the statement basically confirmed I got the question correct/on the right lines at least
    Offline

    4
    ReputationRep:
    For the energy change I divided 3444 by 0.8 and go 4305? ANYONE ELSE?
    Offline

    1
    ReputationRep:
    (Original post by Scarliemarie)
    The lowest boiling point was Rb
    Nope, it was fluorine - check google if you don't believe me - it's well known google never lies. :-)
    Offline

    1
    ReputationRep:
    (Original post by bod247)
    Its Rb because in group 1 (alkali metals), the Boiling point and Melting Point decrease as you go down. Rb was the last Alkali Metal so its the lowest Boiling Melting/Point.
    Yes but rubidium is a solid at room temperature and fluorine is a gas, so it should be fluorine.
    Offline

    14
    ReputationRep:
    (Original post by Aminah53)
    What did everyone get on that table question which asks about the changes of the solutions?
    I got white precipitate for the calcium one, no change for both the water one, no change for one of potassium and for the other potassium one I wrote fizzing and bubbling which i think is probably wrong.
    I got no change for all except 1 of them where I said white precipitate! It looked really wrong lol but oh well.
    Offline

    1
    ReputationRep:
    (Original post by Sadxa)
    For the energy change I divided 3444 by 0.8 and go 4305? ANYONE ELSE?
    The question only asked for energy released by 0.8g of the fuel but you worked it out for 1g of fuel. There was no need to do that
    Offline

    1
    ReputationRep:
    (Original post by etata)
    I got that too
    That answer is right
    Offline

    1
    ReputationRep:
    What was the first question and the methane question?
    Offline

    2
    ReputationRep:
    (Original post by Sadxa)
    For the energy change I divided 3444 by 0.8 and go 4305? ANYONE ELSE?
    Yup...RIP
    Offline

    1
    ReputationRep:
    Anyone else get -217 for bond calculation?
    Offline

    2
    ReputationRep:
    (Original post by miamathewss)
    what did everyone write for question 1 with test tube 1 and 2?
    what about the catalyst used for esters?
    I assume u mean the first question? Tube 2 limewater went cloudy, and I guessed tube one saw bubbling as carbon dioxide was produced?
    Offline

    0
    ReputationRep:
    (Original post by chelseafc141)
    I got -1276 for the bond energies
    me too
    Offline

    1
    ReputationRep:
    (Original post by Youngey4)
    Yes but rubidium is a solid at room temperature and fluorine is a gas, so it should be fluorine.
    The answer is rubidium
    Offline

    1
    ReputationRep:
    I put animals like cows/cattle as they produce alot of methane. Friends put natural gas and biogas too
    Offline

    0
    ReputationRep:
    (Original post by TheAnon121)
    For specific heat capacity, I got 3444J. And some people said it was F for that and some Rb - not sure which one was right
    it was 50j 0.6* specific heat capacity * temp change
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: July 7, 2017
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.