Chemical Bonding Worksheets Page 14
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22Ex. 2: Draw the Lewis structure for CH
O then determine the shape and the bond angles.
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Lewis structure
3D sketch of molecule w/ bond angle
– The three outer atoms are 120˚ from one another
→ shape = trigonal planar (AX
)
3
– three outer atoms at the corners of an equilateral triangle
– Each outer atom is 120˚ from the other two outer atoms.
Ex. 3: Draw the Lewis structure for CH
then determine the shape and the bond angles.
4
Lewis structure
3D sketch of molecule w/ bond angle
– to maximize the distance between the electrons pairs, the bond angles are 109.5˚
→ shape = tetrahedral (AX
)
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– tetra = four, so “tetrahedral” is used to indicate four sides or four faces
– each outer atom is 109.5˚ from the other three outer atoms
MOLECULES WHERE CENTRAL ATOM HAS NO LONE PAIRS
Linear
Trigonal Planar
Tetrahedral
Two outer atoms around
Three outer atoms around
Four outer atoms around
the central atom (AX
)
the central atom (AX
)
the central atom (AX
)
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CHEM 121 Tro Chapter 10 F2012
page 14 of 22
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