Monthly Archives: November 2017

Chemistry SAT class homework, Week of Nov 13, 2017

Please make models of three molecules / ion listed below with paper, sticks and tape:

BF3,  NH3 and (NH4)+

Step 1, write electron configuration of the center atom
Step 2, write Lewis structure of the molecule (i.e. indicate valence electrons with dots around the center atom and terminal atoms)
Step 3, determine polarity of each bond
Step 3, determine the 3-D geometry of electron domain of the molecule
Step 4, determine the geometry of 3-D geometry of the molecule
Step 5, make model of the molecule with paper, sticks and tape
Step 6, indicate the position of each atom on the model (write on)
Step 7, determine if the molecule is polar or non-polar