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QLDChemistryQuick questions
Unit 1: Chemical fundamentals (structure, properties and reactions)
Quick questions on Covalent bonding, Lewis structures, VSEPR and polarity (QCE Chemistry Unit 1)
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is vSEPR theory?Show answer
VSEPR (Valence Shell Electron Pair Repulsion) predicts 3D shape from the count of electron regions around the central atom. An "electron region" is a single bond, a double bond, a triple bond, or a lone pair (each counts as one region). Electron regions arrange themselves to be as far apart as possible.
What is overall molecular polarity?Show answer
A molecule is overall polar if its bond dipoles do not cancel as vectors, and overall non-polar if they do cancel. Two questions to ask:
What is q1?Show answer
Use VSEPR theory to predict the shape and bond angle of . State whether the molecule is polar and justify. [4 marks]
What is q2?Show answer
A molecule has central atom with three bonding pairs and one lone pair. Identify the shape, bond angle and one Queensland-relevant example. [3 marks]
What is q3?Show answer
Compare and . (a) Draw Lewis structures. (b) Predict the shape of each.
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