In the VSEPR model, the geometry of the regions defined by the electron pairs in the valence shell of an atom is called the electron-pair geometry. H
A. The Lewis diagram for SiH, is:
H-Si-H
1
H
The electron pair geometry around the Si atom in SiH, is
There are unshared pair(s) around the central atom, so the geometry of the SiH, molecule is
.
11
B. The Lewis diagram for CH20 is:
C с
H H
Recall that for predicting geometry, double and triple bonds count as only one electron pair region.
The electron pair geometry around the Catom in CH20 is
There are unshared pair(s) around the central atom, so the geometry of the CH2O molecule is

i would say b

explanation:

but i think i would need more information than that

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.