Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

How do I know which are gases?

Announcements Posted on
Talking about ISA/EMPA specifics is against our guidelines - read more here 05-03-2015
  1. Offline

    ReputationRep:
    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

    Click image for larger version. 

Name:	sgchemq.jpg 
Views:	38 
Size:	20.9 KB 
ID:	147642
  2. Offline

    ReputationRep:
    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.
  3. Offline

    ReputationRep:
    (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?
  4. Offline

    ReputationRep:
    (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.
  5. Offline

    ReputationRep:
    (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.

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: May 13, 2012
2015 general election
New on TSR

Loved by Students

Our big survey results unveiled

Article updates
  • 0 new posts
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.