Format Title Materials Procedure Data Graphs if necessary Calculations %Error Experimental Value Questions Discussion Conclusion
Purpose: To construct models of molecules of covalent substances in order to show how their shapes and structure determine their polarity.
Materials: Sargent Molecular Model Set or Johnglass Student Molecular Models Kit
Procedure: Assemble the first set of seven models and have them checked by the teacher. Fill in the Data Table. Take these models apart and
proceed similarly with the second set.
Formula/Electron-dot formula/Bond type polar or nonpolar
Shape of molecule (linear, bent, pyramidal, tetrahedral)
Kind of molecule (polar or nonpolar)
1. Calculate the electronegativity difference and percentage of ionic character for each of the following bonds:
Electronagativity Percentage of ionic character
2. Classify each of the following as ionic crystal, polar covalent molecule, or nonpolar covalent molecule
3. Both water and carbon dioxide are triatomic molecules. Explain why one of these is polar and the other is nonpolar.
Discussion after question
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