Are Marks lost for not cancelling out electrons/protons in ion-electron equations?

    • Thread Starter

    Take this reaction for example.

    2Mno4- + 16H+ + 5H2SO3 + 5H2O --> 2Mn2+ 8H20 + 20H+ + 5SO42-

    Okay, the reaction is balanced and I've cancelled out the electrons, but I haven't cancelled out the H20 molecules and the protons. For a 1 mark question, would I lose the 1 mark?

    Check the mark scheme, but I think that would (and definitely should) be a lost mark.

    It would lose the mark on OCR A papers.
Write a reply… Reply
Submit reply


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. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: September 29, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Would you prefer to be told about sex by your:
Study resources

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

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