HOMEWORK # 0 Review of 120

HOMEWORK # 0 Review of 120 CHEM 121, section 1, Winter 2008. Printed Name: Background needed from 120 Homework Due January. 23, 2007, 12:15 PM! Group Name:

1. (2 pts. total) Circle the correct compound type (ionic or covalent) for the following: formula compound type a) NBr3 (ionic or covalent) b) CH3CH2OK (ionic or covalent) c) C2H5OH (inorganic or organic) d) CH3OK (inorganic or organic) 2. (2 pts. total) For the atoms and ions below, circle the correct ground state valence electron configuration in core format: 2 1 1 0 1 1 1 1 a) Carbon (C): 2s , 2px 2py 2pz or 2s , 2px 2py 2pz b) Potassium ion (K+): 4s1 or 3s2, 3p6 c) Phosphorous (P): 3s2, 3p3 or 3s2, 3p1 2 2 1 0 2 1 1 1 d) Carbon (N): 3s , 3px 3py 3pz or [Ne] 3s , 3px 3py 3pz

3. (1 pts.) Circle the Lewis structures of the following atoms:

a) N

b) C

4. (2 pts. total) Circle the types of bond(s) in following compounds: bonds:

a) CH3OH Covalent Ionic

b) Na2CO3 Covalent Ionic

c) CH3CH2OK Covalent Ionic d) NaCl Covalent Ionic

5. (2 pts. total) Circle the correct Lewis structure for following compounds: a) CH3OH

a) CH3COOH

1 6. (3 pts. total) In the Lewis structure for the urea, CH4NO below, calculate the formal charge of the atoms: Formal charge of a atom = (group #) - (# unshared e-) - ½ (# shared e-)

C = O = H =

7. (4 pts. total) For the following molecule ( NCCH2Br )draw the correct Lewis dot structure. And also indicate geometry and the hybridization around the two atoms (NC(1)C(2)H2Br). Lewis Structure (1 Molecular geometry Hybridization Bond angles () pts.) around the atom (1pts.) and (1pts.) 8. (1pts.) C(1): C(1): NCC=

C(2): C(2): CCBr=

(2pts.) Circle the most polar bond in the following molecule:

9. (1 pt.) Draw Lewis Structure and circle the molecule that is polar.

a) CH2CH2 b) CO2 c) Br2 d) CH2O e) CCl4

10. (3 pts.) Using curve arrows draw all resonance structures for the following:

2 2- :O: :

C O: :

:O: : a) carbonate ion H C HC CH

HC CH C H b) benzene

11. (3 pts.) Name the functional group in each of the following molecules

Molecule Functional group CH3CH2CH2-OH

CH3CH2CH2 Cl O

CH3CH2CH2 CH O

CH3CH2CH2CH2 C OH O

CH3CH2CH2 C OCH2CH3