Additional Questions Ch 2 and 3 PDF

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Additional practice questions for Chapter 1 and 2...

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UBC CHEM 121 ADDITIONAL PROBLEMS 2015

LEWIS STRUCTURES

Extra Practice Questions for Chem 121 ChIRP Chapters 2and 3 Set aside time to try these questions, then check your answers with another student or online. 1. Draw the best Lewis structure for each of the following molecules and ions. Identify the molecular shape (except for diatomics) and, in the case of neutral molecules, whether or not each molecule is polar. Be sure to include any non-zero formal charges, and show all pairs of electrons as pairs of dots and all bond pairs as lines. Finally, draw a perspective diagram of each molecule or ion. (There is only one central atom in each case; it has been underlined where there is possible ambiguity.) (a) PH3

(i) H2Se

(q) N2

(y) CO

(gg) [CN]-

(b) CH3Cl

(j) SCl2O2

(r) SiF4

(z) O2

(hh) IF7

(c) BrOF3

(k) [PO4]3-

(s) [PCl6]-

(aa) SO2

(ii) [ClF4]+

(d) BClI2

(l) XeF2

(t) SeF4

(bb) [HO2]-

(jj) XeO3

(e) ClBr

(m) SOCl2

(u) [ClO3]-

(cc) AsF5

(kk) SNF3

(f) [ClO4]-

(n) PO(NH2)F2

(v) COCl2

(dd) SeFCl

(ll) XeOF4

(g) [NO2]-

(o) HCl

(w) [SCN]-

(ee) FNO

(h) HOCl

(p) NO

(x) ClF3

(ff) XeF4

2. For each of the following, draw all valid resonance structures (only expand octets to reduce formal charge). Circle the best resonance structure(s). What is the molecular shape in each case? For neutral molecules, indicate whether they are polar or non-polar. (a) [ClO4]-

(d) [N3]-

(b) SO3

(e) SeO2

(c) POF3

(f) [SCN] -

UBC CHEM 121 ADDITIONAL PROBLEMS 2015

LEWIS STRUCTURES

3. For each skeletal structure below, complete the Lewis structure by adding bonds and lone pairs where appropriate then draw all valid resonance structures:...