On Molecular Geometry of Hydrazine and Electronegativity

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Discussion Overview

The discussion revolves around the molecular geometry of hydrazine (N2H4) and the factors influencing bond angles in H2S and H2O. Participants explore the implications of electronegativity and steric effects on molecular shape and bond angles, with a focus on the nitrogen atom in hydrazine.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant states that the molecular shape of hydrazine is trigonal pyramidal but questions this due to the presence of five atoms around the nitrogen atom.
  • Another participant suggests that hydrazine does not have a central atom, implying a different understanding of its geometry.
  • There is a discussion about whether electronegativity of the central atom influences bond angles, with one participant questioning this assertion.
  • Some participants mention steric effects as a potential explanation for bond angles rather than electronegativity.
  • One participant draws a parallel between hydrazine and ammonia regarding the arrangement of hydrogen atoms and lone pairs around nitrogen.

Areas of Agreement / Disagreement

Participants express differing views on the molecular geometry of hydrazine and the role of electronegativity versus steric effects in determining bond angles, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations in the assumptions made about the central atom in hydrazine and the definitions of molecular geometry being used. The discussion also reflects uncertainty regarding the influence of electronegativity on bond angles.

Kyoma
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Homework Statement



1. What is the molecular shape of Hydrazine N2H4 w.r.t. N atom?

2. H2S and H2O, which one has a larger bond angle?

2. The attempt at a solution

1. Trigonal Pyramidal is the answer given. But Hydrazine has 5 atoms around its central atom and I'm unable to fathom why is it in trigonal pyramidal.

2. H2O is the answer as O is more electronegative. But why is this the case? I've checked the internet and nothing tells me why an electronegative central atom could cause a larger bond angle.

Thank you for your time.
 
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Hint: hydrazine doesn't have a central atom.

Are you sure oxygen electronegativity plays a role here? Explanations I remember called mostly for steric effects.
 
Ah~ there are 3 H atoms and one pair of lone electrons around N.

Steric forces? The explanation given to me was electronegativity?
 
Kyoma said:
Ah~ there are 3 H atoms and one pair of lone electrons around N.

Sounds like ammonia, not hydrazine.

Steric forces? The explanation given to me was electronegativity?

Can't help it.
 

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