No Questions on Whatsapp please.

I will no longer answer Q’s on whatsapp. Replying on my phone takes too much time. Ask questions here.

I will answer them on this blog. Pleease identify yourself, so I can focus on KYUEM students.



3 thoughts on “No Questions on Whatsapp please.

  1. Hello , Mr Allan. For enthalpy change of formation, we use S instead of S8. I thought for the standard form, we need to choose the most stable one. But why S is more stable than S8? How about for Phosphorus? We use P or P4 for formation? Thank you.


    • It should be S8. But we cheat…. We could easily write 1/8 S8 which would give “1S”, but to make it short, we just write S. It doesn’t seem to cause any problems but doing this, and balancing equations with just “S” in them is easier.
      We sometimes do the same with phosphorous, but for some reason it’s more common to put the fraction in, i.e. 1/4 P4.
      And of course, you’ll be fmiliar with the use of 1/2’s for diatomics like H2 and O2.
      S is of course unstable having an unfilled octet and two unpaired e-. S8 is much more stable. But when we wrote jus the “S”, we assume it’s understood taht we are indeed talking about 1/8 S8.


  2. What is meant my “low volatility”
    It can be described in a number of ways:
    @ A substance that does not vaporise much.
    @ A substance that produces a small vapour pressure
    @ A substance (usually a liquid) that has weak intermolecular forces.


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