Chemical Bonding — Mains Strategy

Mains Strategy

Begin with the structure–property relationship rather than an inventory of bond names. Select one or two comparisons that answer the question directly: solid versus molten sodium chloride for carrier mobility, water versus carbon dioxide for geometry and polarity, or diamond versus graphite for allotropy and material behaviour. Explain each comparison through a short causal sequence.

The body should identify the interacting particles, describe their arrangement and connect that arrangement to the requested property. If using Lewis structures or VSEPR, state what the model represents and avoid describing electron dots as fixed physical objects. Distinguish molecular shape from electron-domain arrangement wherever lone pairs matter.

A usable opening is: “Chemical composition constrains a material's possibilities, but bonding and structure determine how those possibilities are expressed.” Conclude by explaining why practical material selection requires the relevant property under stated conditions. Do not infer a complete engineering advantage from hardness alone or treat boiling as evidence that internal covalent bonds have been broken. The explanation should remain focused on the comparison posed.