Multiple Covalent Bonds

Compounds may form additional bonds in order to become energeticly stable. These multiple bonds have an impact on the physical and chemical properties of compounds.

Technology Standards
Standard 1- Basic operations and concepts
Standard 2- Social, ethical, and human issues
Standard 3- Technology productivity tools
Standard 4- Technology communications tools
Standard 5- Technology research tools
Standard 6- Technology problem-solving and decision-making tools

Information Literacy
Standard 1- The student accesses information efficiently and effectively
Standard 2- The student evaluates information critically and competently
Standard 3- The student uses information accurately and creatively

Reside at the heart of the discipline
Interactions of matter
Chemical bonding

Represents a big idea having enduring value beyond the classroom:
Many chemicals that cause health concerns have multiple bonds. What's the difference between saturated and unsaturated fats?

Require uncoverage, meaning that misconceptions need to be identified and clarified:
Chemical bonds are energetic interactions not physical connections.
Though electrons are represented as dots they are not really particles neither are they stationary.

Offer potential for engaging students:
Activities relating current health concerns to multiple bonds. Is margarine better than butter? Animal fat better than vegetable oil? Corn oil better than olive oil? Who says an Why?

Exit cards, journal responses, and a conclusion to a medical research activity, will each be utilized in this unit. Exit cards will be used after the introduction of a new concept so that the instructor may evaluate the need for reteaching or redirecting the students. In journal responses the teacher should look for statements that would indicate an incorrect understanding or misconception. For the research component the student will collect information on the health consideration related to multiple bonding in compounds and develop a summarizing document that reflects the knowledge they gained and their personal response to the information.

Engagement
Techer will perform a demonstration that contrasts the properties of similar compounds, one of which has a double bond. Chemical formulas are written on the board and discussed. Students will then draw the Lewis Structure for each compound. (The one with the multiple bond will not work out for the students)

Exploration
Students will be given several Lewis Structures to draw that can not be solved with out the use of multiple bonds. Allow the students to experiment and then determine that if more than 2 electrons can be shared then the Octet rule will still be satisfied. The idea of multiple bond is then applied to the demonstration. Now the students should be able to draw the correct Lewis Structure for the compound in the demonstration.

Explanation
Multiple bonds will be introduced to the students by discovering that if there aren't enough valence electrons for each atom to achieve an octet then they will share more electrons thus forming multiple bonds. Students will practice with multiple bonds represented by Lewis structures.

Extension
Students will find definitions for a set of basic medical terms related to the health concerns of food items with multiple bonds. As a class, these definitions will be shared and agreed upon. Students will conduct electronic research focusing on the beneficial and detrimental characteristics of multiple bond in our food stuffs. Each student will prepare a summary statement relating the information and recommendations they gathered to their personal and family dietary patterns. Students will construct a model of both cis- and trans- category of compounds.

Evaluation
The summary statement from the student's research and a quiz over drawing Lewis Structures for multiple covalent bonds will be used to evaluate the student's understanding and ability.

Information Manager
Effective Communicator
Creative and Critical Thinkers
Ethical and Responsible Workers
Resource Manager
Systems Manager
Cooperative Workers
Effective Leader
Culturally Sensitive Leader