Lessons
Here you will find weekly lessons. You will be able to review what was taught in class and any assignments that were included.
Lesson from December 1, 2007
Chemical Change vs. Physical Change
Class: 10th Grade Chemistry
Materials: Beakers, water, ice cream, Styrofoam bowl, sugar, rubbing alcohol, rusted steel, Bunsen burner, paper, soured milk, alka-seltzer tablets
KCC Standard : SC-8-STM-U-3 Students will understand that elements do not break down during chemical reactions (e.g., heating, exposure to electric currents, reaction with acids).
Objective: The students will explain the difference between a physical and chemical change. In pairs, they will observe 8 stations and identify the changes as physical or chemical.
Direct (15 min.)
Students will be in pairs. One student will be the recorder and write down all observations while his/her partner will be performing the experiments. After I have given all directions, each pair will line up at a station. They will complete the experiment and record all observations. Once I see that all groups are finished with their station I will instruct the class to rotate to the next station. They will continue to rotate until all groups have completed all stations. Meanwhile, I will be walking around to each station to assist the students and to answer any questions they have.
The students will be judged on their observations, how many stations they get correct, and how well they work with their partner.
Do (30 min.)
- Each group lines up at a station.
- One student reads instruction sheet at the station and performs experiment.
- Both students communicate what they observe.
- Recorder writes down observations.
- Teacher will assist if needed and answer questions.
- Stations are:
- 1. boiling water
- 2. melting ice cream
- 3. dissolve sugar in water
- 4. alcohol evaporating on hand
- 5. rusted steel
- 6. burn paper
- 7. soured milk
- 8. Alka-Seltzer tab in water
Check for understanding:
-Explain the difference between a chemical change and a physical change.
-Compare what you observed in station 4 to what you observed in station 7.
-List two things that are present in a chemical change that are not present in a physical change.
-Based on your observations of station 1, predict what you will see for station 5.
Debrief (15 min.)
Questions:
-What did you learn about the differences between a physical and chemical change?
-Did you and your partner communicate well?
-Did you and your partner respect each other’s ideas?
-Did you and your partner stay on task and complete observation at all stations?
-Will you be able to observe and distinguish between physical and chemical changes in your everyday life?
