Why can molecules made of three atoms have a bent or linear shape?

The discussion on bent/linear shape, and its further calculation can be defined as follows:

Linear form molecules containing atoms arranged inside a straight line.Molecules having linear electron-pair geometries have sp hybridization so at central atom.Bend molecular geometry, often called angular or V-shaped, relates to molecules that have a non-collinear organization of 2 adjacent bonds.Bent = Linear however bent given the presence of Lone Pairs; more the Lone Pairs, then higher the bent as well as the smaller its degree. This consists of 3 atoms in total.

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Ibelieve its a because an empirical formula usually has a ch in it your options are a or b

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.