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VICChemistryQuick questions
Unit 1: How can the diversity of materials be explained?
Quick questions on Covalent bonding, Lewis structures, VSEPR and polarity: VCE Chemistry Unit 1
6short 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 covalent bonding?Show answer
A covalent bond is a shared pair of electrons between two non-metal atoms. Each atom contributes one electron to the shared pair. The shared pair is attracted to both nuclei, holding the atoms together.
What are lewis structures?Show answer
A Lewis (electron-dot) structure shows every valence electron as a pair of dots or as a line (for a bonding pair). Procedure:
What is vSEPR theory?Show answer
Valence Shell Electron Pair Repulsion theory states that electron pairs around a central atom repel each other and arrange to maximise their separation. Both bonding pairs and lone pairs count. Multiple bonds count as one electron domain.
What is q1?Show answer
Predict the molecular shape and overall polarity of and , and explain the difference. [3 marks]
What is q2?Show answer
Consider with four bonding pairs and one lone pair on sulfur. (a) Predict its geometry. (b) Calculate the approximate bond angles.
What is q3?Show answer
Draw the Lewis structure of and . (a) State the geometry of each. (b) Compare their overall polarity.
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