Molecular Shape of BF3: Trigonal Planar or Pyramidal?

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Discussion Overview

The discussion revolves around the molecular shape of BF3 and its classification as either trigonal planar or pyramidal, particularly in the context of a related molecule BY3, which is confirmed to be polar. Participants explore the implications of molecular geometry on polarity and the specific meanings of terms used in the problem statement.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • Some participants assert that BF3 is trigonal planar, while others suggest it could be trigonal pyramidal or T-shaped, but not trigonal planar.
  • There is a discussion about the interpretation of "Y" in the formula BY3, with some proposing it refers to a specific element rather than all possible elements.
  • One participant expresses confusion regarding the polarity of BF3, questioning whether it is polar or nonpolar.
  • Another participant clarifies that "confirms the polarity" should be interpreted as indicating that BY3 is a polar molecule.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the shape of BF3 or its polarity, with multiple competing views remaining on these topics.

Contextual Notes

The discussion highlights uncertainties regarding the definitions and assumptions related to molecular shapes and polarity, particularly in the context of unspecified elements in the formula BY3.

daphnelee-mh
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Homework Statement
Experiment confirms the polarity of the molecule of formula BY3. Which molecular shapes are possible and which impossible for BY3?
Relevant Equations
-
Answer given is " The molecule could be trigonal pyramidal or T shaped, but could not be trigonal planar."

I am confused as the shape of BF3 is trigonal planar...
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I suppose Y in the BY3 is intended to mean "some particular element", not "every possible element". In other words, question asks about possible shape of a specific molecule for which we know it is polar, not for a shape of every existing molecule - as not all of them will be identical (some will be polar, some will be not polar).
 
daphnelee-mh said:
Homework Statement:: Experiment confirms the polarity of the molecule of formula BY3. Which molecular shapes are possible and which impossible for BY3?
Homework Equations:: -

Answer given is " The molecule could be trigonal pyramidal or T shaped, but could not be trigonal planar."

I am confused as the shape of BF3 is trigonal planar...

Maybe they mean trigonal planar is not polar in the way BY3 is when B is not in the same plane as the Y's?
 
Last edited:
It is hard to know exactly what Y represents. Is there part of the problem statement not shown in the question?
 
No, just written as this
 
daphnelee-mh said:
Experiment confirms the polarity of the molecule of formula BY3.
snip
I am confused as the shape of BF3 is trigonal planar...
Is BF3 polar?
 
Nonpolar, maybe I misunderstood the meaning, as I thought " confirms the polarity " may be polar or nonpolar
 
I can guarantee you that Y means "unspecified element" as others have mentioned.

"Confirms the polarity..." is actually poor wording. You should read it as "confirms it is a polar molecule".
 

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