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How do I know which are gases?

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    In this question, how do you know which reactions would produce gases? I can find the products of all of the pairs of chemicals and I identified CO2 in pair [A], but I'm stumped on the second one. The data book doesn't contain anything helpful. The answer, incidentally, is [A + F], I just don't know how to get [F].

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    I thought three would.

    Remember what you've been learning, a carbonate and an acid forms a soluble substance, CO2 gas and water. Metal and water forms the metal hydroxide and hydrogen. Metal and acid forms a salt and hydrogen.
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    (Original post by Pride)
    I thought three would.

    Remember what you've been learning, a carbonate and an acid forms a soluble substance, CO2 gas and water. Metal and water forms the metal hydroxide and hydrogen. Metal and acid forms a salt and hydrogen.
    Copper doesn't react with water, only highly reactive metals do. The same with silver, it doesn't react with acid. See: http://en.wikipedia.org/wiki/Reactivity_series

    I got the carbonate correct, as I said. The answer scheme says F is correct as well. What I'm asking is how could they possibly expect me to know that the products of that reaction include a gas?
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    (Original post by AtomSmasher)
    Copper doesn't react with water, only highly reactive metals do. The same with silver, it doesn't react with acid. See: http://en.wikipedia.org/wiki/Reactivity_series

    I got the carbonate correct, as I said. The answer scheme says F is correct as well. What I'm asking is how could they possibly expect me to know that the products of that reaction include a gas?
    oh well I don't know then. That isn't going to come up in your test, only stuff you've learnt ok. Don't worry about it.
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    (Original post by Pride)
    oh well I don't know then. That isn't going to come up in your test, only stuff you've learnt ok. Don't worry about it.
    Thanks anyway. It was in a past paper so it could end up in the exam but it shouldn't be too much trouble. It's only one small thing, I just wanted to tie up all the loose ends really.

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Updated: May 13, 2012
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