Molecular Structure and Geometry

 

Unit Overview: For students to learn the properties and rules of or molecular structures. They will use their knowledge in chemical bonding to draw Lewis Structures of the molecular compounds. The students will then be able to determine the molecular geometry of the compound from the Lewis Structure.  

Personal Achievement: I think I learned how to draw Lewis Structures of the molecular compounds. I think I did better than last year and I understand more this year.

Enduring Understanding: There are three types of chemical bond, ionic, covalent, and metallic. Ionic compound are crystallic appearance. Covalent bond have a low melting point, while metallic bond have a high melting point. In order to draw a Lewis Structure, first you need to find the total number of valence electrons. Then, you have to find the number of electrons needed to make the atom “happy”. After that, determine the number of bonds in the molecule. Now you have to choose a central atom, which is the one that is the least electronegative. Finally, finish off by drawing. To determine molecular shape, you need to look at the Lewis Structure first. Ask yourself how many atoms bonded to central atom and what shape it forms.  

Reflection on Progress Towards the Standards:

 

Strengths: Demonstrates the understanding of chemical bonds

Areas for Improvement: Develops reading literacy in science

 

I think I understand well about this and was most of the time able to determine what molecular shape it is. I can also understand about lone pairs of electrons.

This continue to be my challenge. To improve, I can read carefully on the test, especially when I got trick by the question.