[AtomSmasher]

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].

Here's a link in case the attachment doesn't work: http://imgur.com/0aDfy

[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.

[AtomSmasher]

(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?

[Pride]

(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.

[AtomSmasher]

(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.