Unit review: Topics 1 & 28

by: Michael Atkiels

Topic 1

Rule of Workplace Safety

Unit 1 of chemistry contained the following safety rules. These rules were mostly used to help learners and experimental have full safety and knowledge about their workplace. These safety listings are shown in the document below. These listings go over many of the safety and need to know basics of chemistry.

Topic 28

Predicting if a molecule will be polar or nonpolar

Step By Step Guide:


  • Draw the Lewis structure of a Molecule. Note the number of electron regions around the central atom, and of these which are bonding or lone pairs.
  • Use this info to determine the 3D geometry of the molecule. The vsepr rules should still be thought about when proceeding.
  • Valence Shell Electron Pair Repulsion theory; around the central atom all regions of electrons repel each other to get as far away from each other as possible while pivoting around the central atom. (double bonds and triple bonds count as a single area of electrons)
  • Determine if the molecular is polar or non-polar.
  • A molecule is non-polar if the charge distribution is symmetric and polar if the charge distribution is asymmetric or not symmetric.