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Conductivity and Bonding

Time Frame:
1 class period that runs 70 minutes.

Group Size:
Pairs


 

Summary:
Students will measure the conductivity of several compounds and solutions in order to predict the bond types (ionic or covalent) in the substances tested.

Main Curriculum Tie:
Science - Chemistry
Standard 3 Objective 1

Analyze the relationship between the valence (outermost) electrons of an atom and the type of bond formed between atoms.

Materials:

  • student sheet (attached)
  • goggles
  • conductivity apparatus (conductivity indicator)
  • chemplates with large enough wells for both probes to fit in solution
  • hot plate (demo)
  • evaporating dish (demo)
  • containers of NaCl, Sucrose, KCl, and KClO3 for teacher only if doing demo.

Attachments

Student Prior Knowledge:
Students should know that electrical currents are produced and measured by the movement of positive or negative particles; and that in solids only negative charges (free electrons) can move.

Instructional Procedures:
Teacher’s demos: (optional)

KClO3 can explode or ignite if it is heated to decomposition or mixed with acids or organic matter. Heat it just unitil it melts, use it behind a demonstration shield or a hood.

Molten: Place about 3 g of the solid in an evaporating dish and heat to melting with a burner.

If you don’t want to demo these then just delete them from the data table.

This lab works best in the dark—you can see the light bulb better

Note: Additional compounds may be used, of course.

Directions for student lab are detailed on the student worksheet attached.

Bibliography:
Lesson Design by Jordan School District Teachers and Staff.

Author:
Utah LessonPlans

Created Date :
Dec 12 2014 09:50 AM

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