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Course/Class: Science 8 Date: October 10, 2009 Topic: Chemical Bonding Unit: Chemistry A. Intents/Objectives/Purpose Program of Studies (Pedagogic Purpose): • Develop an understanding of atoms and chemical bonding as explanatory models for chemical processes Academic Purpose: In this activity, students learn how atoms form compounds for stability and that: • Atoms combine with one another in order to get a full outer valence shell of electrons • When a metal and nonmetal combine through exchange of electrons it’s called Ionic Bonding • When two nonmetals combine by sharing electrons, this is called Covalent Bonding C. Activities B. Displays/Resources Administration/Homework

• Read daily bulletin, take attendance, hand-out any messages to students, • Collect homework

SchoolSoft- Attendance and record homework

1. Introduction/Set/Advanced Organizers • Ask students “Do all atoms exists individually or do they recombine

together?” “Why do the bond together?” • Make sure students aware of lesson objectives. Write them on the board

clearly. • Activate the prior knowledge about electronic structure of the atom and

specifically the unique structure of noble gases

Notebooks, Whiteboard, various colored markers, Chemistry textbooks

2. Clarifying/Creating-Understanding/Concept-Development • Have students record lesson title in their table of contents, and with the

lesson objectives in their notebooks • Draw the nucleus of He, Ar, and Ne and have three students come up and

write the electronic configuration. “What do we notice is similar between these three atoms? Why is this important?”

• Highlight that atoms can either gain or loose electrons, in order to reach a full octet. “Is it easier to gain or to lose?” “Do metals tend to gain or loose? And nonmetals?” Do several examples as a class using the Periodic Table

• Show how Bohr diagrams can be used to illustrate bonding between atoms give an examples

3. Coached/Guided-Practice/Seatwork • Write on the board some examples of chemical compounds (KI, CO2, H20,

CaCl2) and have students identify bond as ionic or covalent, write the electronic structure of the constituent atoms and Bohr diagram illustrating their bonding

• Circulate and ask questions and assess student understanding • Have students complete unfinished questions for homework.

4. Closure/Summary • Summarize bonding • Make sure class is clean and benches are straight and ordered