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SingaporeChemistryQuick questions
Physical Chemistry
Quick questions on Chemical bonding and molecular shape (VSEPR): Singapore A-Level H2 Chemistry
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 are the three bonding types?Show answer
Ionic bonding is the electrostatic attraction between oppositely charged ions formed by electron transfer (typically metal to non-metal). It gives giant ionic lattices: high melting points, brittle, conduct when molten or aqueous.
What are the boiling-point anomalies?Show answer
Down a group the hydrides should boil higher (more electrons, stronger dispersion forces), and they mostly do. But , and boil anomalously high because of hydrogen bonding. Water is the standout: each molecule has two H atoms and two lone pairs, so it forms an extensive hydrogen-bonded network.
What are double bonds counting as two regions?Show answer
A double bond is one region of electron density for VSEPR, not two.
What is q1?Show answer
Predict the shape and bond angle of (a) and (b) . [2+2 marks]
What is q2?Show answer
State and explain whether is polar. [2 marks]
What is q3?Show answer
Place , and in order of increasing boiling point and explain. [3 marks]
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