LESSON PLAN
LESSON PLAN
Topic: Orange juice clock
Name: SAVITA PARMAR
Class: Physical science
Grade Level: 8 GATE
Major Concepts:
1. Two different metals are immersed in and electrolyte solution to produce
an electric current sufficient to run a clock.
2. Metals seem to compete for the electrons.
3. Metals like Li that are near the beginning of the activity series are
more likely to lose electrons that those of Au that are near the bottom.
4. The tendency of electrons to flow from the substance that is oxidized to
the substance that is reduced produces the voltage that we can harness in an
electrochemical cell.
Performance Objective / Content Standards: Chemistry
Atomic and Molecular Structure
1. The periodic table displays the elements in increasing atomic number and
shows how periodicity of the physical and chemical properties of the
elements relates to atomic structure. As a basis for understanding this
concept:
g. Students know how to relate the position of an element in the periodic
table to its quantum electron configuration and to its reactivity with other
elements in the table.
Materials and Equipment: large electric clock with a second hand that
operates with one AA cell, copper strip several cm. long, magnesium ribbon,
fine steel wool, orange juice, beaker to contain orange juice, 2 wires with
alligator clips about 30 cm long.
Independent practice / Assignments: The students shall observe a ready made
ìTwo Potato clockî or the ìlemon batteryî where the explanation and the
instructions would be provided by the teacher.
Outline of Lesson:
1. Use the steel wool to clean the copper strip and Mg ribbon.
2. Coil the Mg ribbon around a pencil.
3. Attach the 2 wires with alligator clip to the 2 contact points on the AA
cell holder in the back of the clock.
4. Fasten the Cu strip to the wire attached to + ve terminal of the holder
and Mg to the negative end.
5. Immerse the Mg and Cu electrodes in the orange juice.
6. Observe what happens to the second hand of the clock.
Explanation: Mg is more reactive than Cu and loses electrons more easily.
When the Mg reacts with the acid in the orange juice, it loses electrons.
The wires and the clock provide and external path for extra electrons to
move around to the copper and back to the juice forming a complete circuit.
Homework: Attempt the following activities and write the results in your
own words.
1. What will happen if the connections to the electrodes are reversed?
2. What other combinations of metals will work as an electrode?
3. What other substances will make a good electrolyte?
References: Mr. Al Guenther showed this demonstration during a workshop held
for Science teachers organized by Bureau of Education and Research at
Anaheim, California.
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related searches
- lesson plan themes by month
- water lesson plan for preschoolers
- watershed lesson plan activity
- lesson plan themes for toddlers by month
- preschool lesson plan templates blank pdf printable
- toddler lesson plan template printable
- school age lesson plan ideas
- free preschool lesson plan template printables
- daycare weekly lesson plan template
- school age lesson plan format
- lesson plan themes preschool
- school age lesson plan sample