University:
Glendale Community College
Course:
CHM130 | Fundamental Chemistry
Academic year:

2020
Views:

318

Pages:

5
Author:

Meredith Carney

Name: ___________________ Section: ____________ Chapters 6 and 7 Practice Worksheet: Covalent Bonds and Molecular Structure 1) How are ionic bonds and covalent bonds different? 2) Describe the relationship between the length of a bond and the strength of that bond. 3) Identify the type(s) of bond(s) found in the following molecules: a. CCl4 ___________________________ b. Li2O ___________________________ c. NF3 ___________________________ d. CaSO4 ___________________________ e. SO2 ___________________________ f. Mg(OH)2 ___________________________ 4) Define electronegativity. 5) Use electronegativity values to place the following elements in increasing order: F, N, H, P, Si, C, O 6) Determine if the bond between atoms in each example below is nonpolar covalent, polar covalent, or ionic. a. H-H __________________ e. N-F __________________ b. P-Cl __________________ f. Mg-O __________________ c. F-F __________________ g. C-H __________________ d. Na-Br __________________ h. H-Cl __________________ page 1 of 5 Name: ___________________ Section: ____________ 7) Draw Lewis Structures for the following molecules: a. CO2 j. NF3 b. BeCl2 k. CO c. H2O l. O3 d. BF3 m. CO32- e. CCl4 n. SO2 f. NH3 o. PF5 g. NO3- p. SF4 h. SO3 q. SF6 i. SO32- r. XeF4 8) Which of the compounds or ions in problem 7 require resonance structures to describe the structure properly? Draw them and include formal charges for each atom in your drawings. page 2 of 5 Name: ___________________ Section: ____________ 9) Which of the compounds or ions in problem 7 are exceptions to the octet rule? 10) Fill in the table below to determine the molecular geometry for the following molecules: Formula ABE formula Number of edomains on central atom # e- domains / # non-bonding domains on central atom ElectronDomain Geometry (name) Molecular Geometry (name) Bond angle(s) on central atom CO2 BeCl2 H2 O BF3 CCl4 NH3 NO3- SO3 SO32- NF3 page 3 of 5 Name: ______________________ Formula ABE formula Number of edomains on central atom Section: _______________ # e- domains/ # non-bonding domains on central atom ElectronDomain Geometry Molecular Geometry (name) Bond angle(s) on central atom CO O3 CO32- SO2 PF5 SF4 SF6 XeF4 11) a. Identify the molecules in the table above that are polar. 12) For XeO3, some people prefer to draw a Lewis Dot Structure that obeys the octet rule. Others prefer to draw resonance structures that have lower formal charges. Draw eight resonance forms for xenon trioxide and indicate the formal charges on each atom in each resonance form. There is not a “right” resonance form, but some are arguably better than others. page 4 of 5 Name: ______________________ Section: _______________ 13) Indicate the hybridization of the central atom. Also indicate the total number of sigma () and pi () bonds in the following molecules and ions. Formula Hybridization of central atom # of  bonds # of  bonds CO2 BeCl2 H2 O BF3 CCl4 NH3 NO3SO3 SO32NF3 CO O3 CO32SO2 PF5 PCl5 SF6 TeF6 page 5 of 5