Turn on thread page Beta

science question :) watch

    Offline

    14
    ReputationRep:
    (Original post by SamTheMan)
    Yeah... I would have thought it would be a reaction between ions or maybe he just left out the + and - signs.
    Yeh If it's in water, then it should be ions..shouldn't it?
    Offline

    0
    ReputationRep:
    (Original post by trigger)
    i got a B for GCSE science...shows how awful the school system is these days :rolleyes:
    got a low A myself, and i dont understand any of that

    Na + Ag >>

    stuff
    Offline

    14
    ReputationRep:
    (Original post by glance)
    Yeh If it's in water, then it should be ions..shouldn't it?
    Um basically that's one thing I remember from Chemistry too...
    Offline

    14
    ReputationRep:
    (Original post by saiyamana)
    got a low A myself, and i dont understand any of that

    Na + Ag >>

    stuff
    Na = sodium
    Ag = silver
    >> goes to or similar (i.e. direction of rxn)

    not that 10p's are silver
    Offline

    0
    ReputationRep:
    (Original post by Fluffy)
    10p pieces are 'cupro-nickel', not silver.
    Cheers makes more sense.

    Cupro-nickel = CuNi
    Bicarbonate of soda = NaHCO3

    These two react:

    4CuNi + 2NaHCO3 » 4CuO + 4Ni + 2NaOH

    producing Copper Oxide and Sodium hydroxide and the colour change due to Nickel being displaced.

    :cool:
    Offline

    0
    ReputationRep:
    (Original post by SamTheMan)
    Yeah... I would have thought it would be a reaction between ions or maybe he just left out the + and - signs.
    possibly
    Offline

    0
    ReputationRep:
    (Original post by SamTheMan)
    Yeah... I would have thought it would be a reaction between ions or maybe he just left out the + and - signs.
    Ionic reaction, but that doesn't matter. :cool:
    Offline

    14
    ReputationRep:
    (Original post by Fluffy)
    Na = sodium
    Ag = silver
    >> goes to or similar (i.e. direction of rxn)

    not that 10p's are silver
    That's what I thought too... we'd be pretty rich if they were silver.
    Offline

    14
    ReputationRep:
    (Original post by Ramsy)
    Cheers makes more sense.

    Cupro-nickel = CuNi
    Bicarbonate of soda = NaHCO3

    These two react:

    4CuNi + 2NaHCO3 » 4CuO + 4Ni + 2NaOH

    producing Copper Oxide and Sodium hydroxide and the colour change due to Nickel being displaced.

    :cool:
    Where does the Nickel go then? hmmmm
    Offline

    18
    ReputationRep:
    (Original post by Ramsy)
    Cheers makes more sense.

    Cupro-nickel = CuNi
    Bicarbonate of soda = NaHCO3

    These two react:

    4CuNi + 2NaHCO3 » 4CuO + 4Ni + 2NaOH

    producing Copper Oxide and Sodium hydroxide and the colour change due to Nickel being displaced.

    :cool:
    makes sense, since the surface of the coin reacted turning brown due to the presence of the copper oxide layer. Interesting.
    Offline

    0
    ReputationRep:
    (Original post by Fluffy)
    Na = sodium
    Ag = silver
    >> goes to or similar (i.e. direction of rxn)

    not that 10p's are silver
    k i get it now. thanks
    Offline

    2
    ReputationRep:
    rust is iron oxide, so it cannot be that (10p's are made of cupro-nickel)
    Offline

    18
    ReputationRep:
    (Original post by o-e-s-j)
    rust is iron oxide, so it cannot be that (10p's are made of cupro-nickel)
    look at the reaction posted by ramsy. It might be wrong, but based on that, the brown colour of the coin is accounted for. I don't know if that post is directed at me, but I said copper oxide.
    Offline

    1
    rust i'd say
    Offline

    1
    ReputationRep:
    i thought cooper oxide was green...i'm probably wrong though
 
 
 
Poll
Which accompaniment is best?
Useful resources
AtCTs

Ask the Community Team

Got a question about the site content or our moderation? Ask here.

Welcome Lounge

Welcome Lounge

We're a friendly bunch. Post here if you're new to TSR.

Groups associated with this forum:

View associated groups

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.