Tag Archives: valence electrons

Molecular Structure and Properties: Octet Rule

For today’s starter activity, students were challenged to draw the molecular structures represented by the chemical equation for cellular respiration:

C6H12O6 + O2 -> H2O + CO2 + ATP

Many students were able to draw molecular oxygen (O2, with a double bond between the two oxygen atoms), water, and carbon dioxide (also with double bonds connecting the central carbon atom to the two oxygen atoms).  The molecular structure of glucose (C6H12O6) was far more challenging.  We transitioned into Lesson 32, which brought together the concepts of molecular structures, valence electrons, covalent bonding, and Lewis dot symbols.  We reviewed the Lesson 32 PowerPoint and then students worked in groups of four to complete the Lesson 32 worksheet.  To help students visualize molecular structures, we used the molecular modeling kits.  The kits were especially helpful in helping students understand double and triple bonds.

Matter, Atomic Structure, and Bonding: Formulas for Ionic Compounds

We worked through student questions about Lesson 20 for the first part of class, with several of the questions guiding students through the learning the textbook intended to introduce through the Salty Eights game in Lesson 21.  Rather than play the game, students instead used the last part of class to begin working with molecular modeling kits (something they will be introduced to later in the textbook).  Although we did not use it today, the Lesson 21 PowerPoint is available for download.  We will work through portions of the Lesson 21 worksheet tomorrow, playing the game at the beginning of class.

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Matter, Atomic Structure, and Bonding: Ions

Our learning about electrons continued with the Lesson 19 PowerPoint introducing students to the concept of ions.  Students received the Noble Gas Envy handout and we walked through the example on the whiteboard.  The discussion prompted a student question about how two atoms of hydrogen bind with an oxygen atom to form a water molecule which was also captured on the whiteboard (pictured below).  For classwork, students received the Lesson 19 Worksheet and the Ion Cards Game Cards that accompanies it.  For homework, students should complete the Lesson 19 textbook questions #2-16 (evens only).