Specify the local electron geometries about the atoms labelled a-d. Unshared electron pairs affect local geometry and are included in the structural formula. For each atom enter one of the following: tetrahedral, square planar, trigonal planar, trigonal pyramidal, or linear. (a) (b) (c) H- H H-C H H H H H 03 B -H

A

Like several other bonds, carbon-oxygen bonds have lengths and strengths that depend on the bond order. Draw Lewis structures for the following species, and arrange them in order of increasing carbon-oxygen bond length. (Indicate the order with the numbers from the drop-down list, starting with 1 for the compound with the smallest bond length to 5 for the compound with the largest bond length.) a) HCO3-(H attached to O)b) CO32-c) CH4Od)  H2COe)  CO

a Use the VSEPR model to predict the bond angles and geometry about each highlighted atom: HH H-C-C-O-H II HH b C about C 109.5°, tetrahedral; about O 109.5°, bent about C 109.5°, tetrahedral; about O 180°, linear about C 120°, planar; about O 109.5°, tetrahedral about C 109.5°, bent; about O 180°, linear HH H-C-C-H I HH 109.5°, tetrahedral 120°, planar 180°, linear 109.5°, bent HO H-C-C-C-H H 120°, planar 109.5°, tetrahedral 109.5°, bent

H-c-ö-H H-N-c-H H-C-Ñ=ö: H-ċ-CEN: Which of the structures shown below has 4 sigma (g) bonds and 2 pi (1) bonds? (a) (b) (c) (d) O a O b